Device intended to be attached to a plurality of terminals of a print cartridge

Abstract

A liquid container with a device that emits a first low voltage to a first terminal at a first instant in time during a period in which the voltage input to a second terminal is high voltage. After emitting the first low voltage, the device emits a second high voltage to the first terminal at a second instant in time during a period in which the voltage input to that terminal is low voltage. After emitting the second high voltage, the device emits a second low voltage to the first terminal at a third instant in time during a period in which the voltage input to that terminal is high voltage.

Description

Device intended to be attached to a plurality of terminals of a print cartridge This application is based on, and claims priority over, JP application serial number 2021-214139, filed on December 28, 2021 and JP application serial number 2021-214129, filed on December 28, 2021. Background 1. Technical Field This disclosure relates to a device, a plate, a liquid housing reservoir, a printing system, and a use of the plate or liquid housing reservoir. 2. Related technique In the related art, a technique is known for detecting the mounting of a detachably mounted ink cartridge in a printing apparatus using a mounting detection terminal of a terminal group (International Patent Publication No. WO 2012 / 029311). The terminal group includes five memory terminals and four mounting detection terminals, one of which is subjected to a high voltage exceeding the power supply voltage. The mounting detection terminals are arranged at the four corners of the terminal group to surround the memory terminals. In WO 2012 / 029311, when the mounting detection terminal is electrically coupled to a terminal on the apparatus side, the printing apparatus determines that the ink cartridge is mounted in the printing apparatus. Furthermore, a technique is known for detecting the assembly of a detachably mounted ink cartridge in a printing apparatus using a memory terminal (document JP-A-2011-170740). A storage device, such as memory provided in the ink cartridge, emits a response signal to notify a host terminal that the storage device is coupled to a host device, such as a printing apparatus, via any of a reset terminal, a clock terminal, and a data terminal. The host device uses the response signal from the storage device to determine whether or not the storage device is coupled to the host device, without using a dedicated coupling detection terminal. However, documents WO 2012 / 029311 and JP-A-2011-170740 do not mention the detection of short circuits between memory terminals. In WO 2012 / 029311, when a short circuit occurs between the memory terminals, even if the ink cartridge is determined to be mounted in the printer, the printer may not function normally, or reading / writing to the ink cartridge memory may not occur normally. In JP-A-2011-170740, when a short circuit occurs between the memory terminals, the memory may not be able to send an original signal to the printer, and the printer may not be able to determine that the memory is properly connected. Summary One advantage of some aspects of the disclosure is that it provides a technique capable of detecting that a short circuit does not occur between terminals in a liquid housing reservoir such as an ink cartridge. Alternatively, another advantage of some aspects of the disclosure is that it provides a technique capable of detecting that the liquid housing reservoir is mounted. Alternatively, yet another advantage of some aspects of the disclosure is that it provides a technique capable of detecting a short circuit even when a short circuit occurs between the terminals. Alternatively, still another advantage of some aspects of the disclosure is that it provides a technique capable of suppressing the occurrence of a short circuit between the terminals. The present disclosure achieves at least one of the above advantages. According to a first aspect of the present invention, a liquid housing reservoir is provided as defined in appended claim 1. Preferred features are set forth in the dependent claims. Brief description of the drawings The embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, in which: Figure 1 is a perspective view illustrating a hardware configuration of a printing system. Figure 2 is a schematic diagram illustrating a configuration of the printing system. FIG. 3 is a first perspective view illustrating a liquid housing tank configuration. FIG. 4 is a second perspective view illustrating the configuration of the liquid housing tank. FIG. 5 is a first diagram illustrating a plate configuration. FIG.6 is a second diagram illustrating the board configuration. FIG.7A is a diagram illustrating one way in which the liquid housing tank is to be mounted on a cart. FIG.7B is a first diagram illustrating a coupling mechanism. FIG.7C is a second diagram illustrating the coupling mechanism. Figure 8 is a schematic diagram illustrating an electrical configuration of the printing system. Figure 9 is a diagram illustrating a functional configuration of a printing apparatus along with a liquid reservoir. FIG. 10A is a flow diagram illustrating a process executed by the printing apparatus in coupling state determination processing. FIG. 10B is a flowchart illustrating a process executed by a device in the coupling state determination processing. Figure 11A is a timing diagram when the printing device emits a request signal. Figure 11B is a timing diagram when the device emits a first response signal and a second response signal. FIG.11C is a diagram illustrating the details of the first response signal. FIG.11D is a diagram illustrating the details of the second response signal. FIG. 12 is a diagram illustrating a scheme of the coupling state determination processing performed by a main control unit. FIG.13A is a first timing diagram illustrating the coupling state determination processing. FIG. 13B is a second timing diagram illustrating the coupling state determination processing. FIG.14A is a third timing diagram illustrating the coupling state determination processing. FIG.14B is a fourth timing diagram illustrating the coupling state determination processing. FIG. 15 is a fifth timing diagram illustrating the coupling state determination processing. FIG.16A is a sixth timing diagram illustrating the coupling state determination processing. FIG.16B is a seventh timing diagram illustrating the coupling state determination processing. FIG.17 is an eighth timing diagram illustrating the coupling state determination processing. FIG.18A is a ninth timing diagram illustrating the coupling state determination processing. FIG.18B is a tenth timing diagram illustrating the coupling state determination processing. FIG.19 is an eleventh timing diagram illustrating the coupling state determination processing. FIG. 20A is a twelfth timing diagram illustrating the coupling state determination processing. FIG.20B is a thirteenth timing diagram illustrating the coupling state determination processing. FIG.20C is a diagram that illustrates another specific example of coupling state determination processing. FIG.21A is a diagram illustrating a plate like embodiment 1. FIG. 21B is a diagram illustrating examples of arrangements shown in FIG. 2 and 3. 21A. FIG.22 is a diagram illustrating a plate having two patterns like embodiment 2. FIG.23 is a diagram illustrating a plate having two patterns like embodiment 3. FIG.24 is a diagram illustrating a plate having two patterns like embodiment 4. FIG.25 is a diagram illustrating a plate having two patterns like embodiment 4. FIG.26 is a diagram illustrating a plate like embodiment 5. FIG.27 is a diagram illustrating a plate having two patterns like embodiment 6. FIG.28 is a diagram illustrating a plate like embodiment 7. Figure 29 is a perspective view illustrating a liquid housing tank as embodiment 1. Figure 30 is a perspective view illustrating a liquid housing tank as embodiment 2. Figure 31 is an enlarged view illustrating a periphery of the liquid housing tank plate. Figure 32 is a perspective view illustrating a liquid housing tank as embodiment 3. Figure 33 is a perspective view illustrating a liquid housing tank as embodiment 4. Figure 34 is a perspective view illustrating a liquid housing tank as embodiment 5. Figure 35 is a perspective view illustrating a liquid housing tank as embodiment 6. Figure 36 is a diagram illustrating a liquid housing tank as embodiment 7. FIG.37 is a diagram illustrating a liquid housing tank as embodiment 8. FIG. 38 is a perspective view illustrating a liquid housing reservoir as embodiment 9. FIG. 39 is an enlarged view illustrating the periphery of the plate. FIG. 40 is a first diagram illustrating a procedure for mounting the liquid housing reservoir in a housing section of the printing apparatus. FIG. 41 is a second diagram illustrating the procedure for assembling the liquid housing reservoir in the housing section of the printing apparatus. FIG.42 is a diagram illustrating a state in which the assembly of the liquid housing tank is completed. FIG.43 is a diagram illustrating a printing system like embodiment 1. FIG.44 is a diagram illustrating a printing system like embodiment 2. FIG.45 is a diagram illustrating a printing system like embodiment 3. FIG.46 is a diagram illustrating a printing system like embodiment 4. FIG. 47A is a first timing diagram in a printing system that includes six liquid holding tanks. FIG. 47B is a second timing diagram in the printing system that includes the six liquid housing tanks. FIG. 48 is a schematic diagram illustrating an electrical configuration of the printing system that includes the six liquid housing reservoirs. FIG.49 is a diagram illustrating a device like embodiment 1. Description of examples A. First realization: A1. Hardware configuration: The schematic of a 1000 printing system will be described with reference to Figures 1 and 2. Figure 1 is a perspective view illustrating a hardware configuration of the 1000 printing system. Figure 2 is a schematic diagram illustrating a configuration of the 1000 printing system. In Figure 1, an X-axis, a Y-axis, and a Z-axis are indicated, all perpendicular to each other. The directions in which the arrows of the X-axis, Y-axis, and Z-axis point indicate positive directions along the X-axis, Y-axis, and Z-axis, respectively. The positive directions along the X-axis, Y-axis, and Z-axis are +X, +Y, and +Z, respectively. The directions opposite to those in which the arrows of the X-axis, Y-axis, and Z-axis point indicate negative directions along the X-axis, Y-axis, and Z-axis, respectively.The negative directions along the X-axis, Y-axis, and Z-axis are the -X, -Y, and -Z directions, respectively. When the positive and negative values ​​of the directions along the X, Y, and Z axes are irrelevant, the directions can be referred to as the X, Y, and Z directions, respectively. The same applies to the drawings and description below. The X, Y, and Z axes depicted in the other drawings correspond to the X, Y, and Z axes in Figure 1, respectively. In Figure 1, in the normal operating position of the 1000 printing system, the front direction of the 1000 printing system is set as the +Y direction. The +Z direction is assumed to be the direction of gravity, and the -Z direction is assumed to be the direction of antigravity. The printing system 1000 includes a printing unit 20 and a plurality of fluid housing reservoirs 100. Specifically, the printing unit 20 is an inkjet printer. Specifically, the fluid housing reservoir 100 is an ink cartridge. The printing unit 20 includes a printhead drive mechanism, a main scan feed mechanism, and a sub-scan feed mechanism. The printhead drive mechanism includes a carriage 30. The carriage 30 includes a housing section 4 and a printhead 5. The housing section 4 is configured to detachably mount four fluid housing reservoirs 100. In this disclosure, the phrase "the fluid housing reservoir 100 is mounted on the printing apparatus 20" means that the fluid housing reservoir 100 is physically attached to the printing apparatus 20 and a cp contact portion of a terminal 290 described below is electrically coupled to a terminal on the apparatus side 490 described below. Each of the four fluid housing reservoirs 100 is housed in a predetermined position on the housing section 4. In this disclosure, the four fluid housing reservoirs 100 house fluids of different colors.The liquid is specifically an ink, and is referred to as ink hereafter. When the four liquid housing reservoirs 100 are distinguished from one another, the four liquid housing reservoirs are referred to as liquid housing reservoirs 100A to 100D. Carriage 30 is configured to be able to move to a replacement position where it is possible to replace liquid housing reservoir 100 and a standby position where it is not possible to replace liquid housing reservoir 100. The print head 5 is provided on the surface of the carriage 30 in the +Z direction. A plurality of nozzles for discharging ink droplets are provided on the surface of the print head 5, which is oriented in the +Z direction. Each nozzle is coupled to any one of the fluid housing reservoirs 100A to 100D mounted in the housing section 4 via a flow path in the carriage 30. The housing section 4 is provided with a fluid inlet portion 6, described below, and a coupling mechanism 400, also described below. The fluid inlet portion 6 is configured to be detachable from a fluid supply port (described below) 104p of the fluid housing reservoir 100.In the liquid introduction portion 6, ink is supplied from the liquid housing reservoir 100, and the ink is introduced into the print head 5 through the flow path in the carriage 30. The coupling mechanism 400 includes a plurality of apparatus-side terminals 490 described below. The main scan feed mechanism includes a drive belt 36, a carriage motor 32, a sliding shaft 34, and a pulley 38. The drive belt 36 is an endless belt stretched between the carriage motor 32 and the pulley 38. The carriage 30 is attached to the drive belt 36. The sliding shaft 34 is provided parallel to the shaft of a paper feed roller 26, described later, and slides along it. As the carriage motor 32 rotates, the carriage 30, attached to the drive belt 36, moves in the +X and -X directions along the sliding shaft 34. The subscan feeding mechanism includes a paper feed motor 22 and a paper feed roller 26. As the paper feed motor 22 rotates, the paper feed roller 26 carries a PA printing medium in the Y direction. The printing apparatus 20 further includes a main control unit 40. The main control unit 40 is coupled to the carriage 30 by a cable 31. A bus 46 is formed on the cable 31, and the main control unit 40 is electrically coupled to a subcontrol board 500 (described later) of the carriage 30 via the bus 46. The main control unit 40 controls each of the above mechanisms to perform the print processing. For example, the main control unit 40 receives a print job from a user via a computer 90 through a connector 80 and performs the printing based on the content of the received print job. A print medium PA is transported in the +Y direction by the paper feed roller 26, and the print head 5 mounted on the carriage 30 moves in the +X and -X directions along the drive belt 36. In this way, ink is discharged from the print head 5 in the +Z direction. The discharged ink falls onto a specific location on the print medium PA, forming an image. In this disclosure, an "image" includes characters and symbols.In this disclosure, the +X and -X directions in which carriage 30 moves are collectively referred to as the "primary scan direction." The -Y and +Y directions in which the PA print media is fed are collectively referred to as the "subscan direction." The printing device 20 also includes an operating portion 70. The user performs various configurations of the printing device 20 or checks the status of the printing device 20 using operating portion 70. As described above, the printing apparatus 20 includes the printhead 5, the liquid introduction portion 6 for introducing a liquid into the printhead 5, the housing section 4 which is provided with the liquid introduction portion 6 and houses the liquid housing reservoir 100, and the plurality of apparatus-side terminals 490. The printhead 5 is provided in the printing apparatus 20. The printhead 5 is not provided in the liquid housing reservoir 100. Printing systems in which the printhead 5 is provided in the liquid housing reservoir 100 are of a different type and are in a different technical field than this disclosure. The configuration of the liquid housing tank 100 will be described with reference to FIG. 3 and 4. FIG. 3 is a first perspective view illustrating the configuration of the liquid housing tank 100. FIG. 4 is a second perspective view illustrating the configuration of the liquid housing tank 100. The X-axis, Y-axis, and Z-axis directions for the liquid housing tank 100 are established based on a state where the printing apparatus 20 is arranged in a horizontal plane parallel to the X and Y directions, and the liquid housing tank 100 is mounted on the printing apparatus 20, as illustrated in FIG. 1. As illustrated in FIG. 3 and 4, the external shape of the liquid housing tank 100 is a substantially rectangular parallelepiped shape. As illustrated in FIG. 3, the liquid housing tank 100 includes a liquid housing body 101 capable of housing an ink as a liquid, and a liquid supply portion 104 having a liquid supply orifice 104p. A plate 120 of the liquid housing tank 100 is shown in FIG. 4. The liquid housing body 101 forms the outer casing of the liquid housing tank 100. The liquid housing body 101 has a first wall 101wf, a second wall 101wr, a third wall 101wb, a fourth wall 101wu, a fifth wall 101wsa, and a sixth wall 101wsb. An ink chamber 150, which houses an ink, is formed within the liquid housing body 101 by the six walls 101wf, 101wr, 101wb, 101wu, 101wsa, and 101wsb. The first wall, 101wf, is a wall on the +Y direction side and forms a front wall. The front wall faces the front side of the printing system 1000. The second wall, 101wr, faces the first wall 101wf. The second 101wr wall is a wall on the -Y direction side and forms a back wall. The back wall faces the rear side of the 1000 print system.The third wall 101wb intersects the first wall 101wf and the second wall 101wr, and is substantially perpendicular to the first wall 101wf and the second wall 101wr in the present embodiment. The third wall 101wb is a wall on the +Z direction side and forms a lower wall. The fourth wall 101wu intersects the first wall 101wf and the second wall 101wr, and is substantially perpendicular to the first wall 101wf and the second wall 101wr in the present embodiment. The fourth wall 101wu is oriented towards the third wall 101wb. The fourth wall 101wu is a wall on the -Z direction side and forms a top wall. The fifth wall 101wsa intersects the first wall 101wf to the fourth wall 101wu and is substantially perpendicular to the first wall 101wf to the fourth wall 101wu in the present embodiment. The fifth wall 101wsa is a wall on the -X direction side and forms a right-hand side wall.The sixth wall 101wsb intersects the first wall 101wf to the fourth wall 101wu and is substantially perpendicular to the first wall 101wf to the fourth wall 101wu in the present embodiment. The sixth wall 101wsb is oriented to the fifth wall 101wsa. The sixth wall 101wsb is a wall on the +X direction side and forms a left side wall. The liquid supply portion 104 is a tubular member projecting from the third wall 101wb. The liquid supply orifice 104p is located on the tip side of the liquid supply portion 104. The liquid supply orifice 104p communicates with the ink chamber 150 of the liquid housing body 101. When the liquid housing reservoir 100 is mounted on the carriage 30 of the printing apparatus 20, ink is supplied to the liquid introduction portion 6 (described later) of the carriage 30 through the liquid supply orifice 104p. The liquid supply orifice 104p is sealed by a film 104f. The liquid supply orifice 104p is configured to be detachable from the liquid introduction portion 6. When the liquid housing tank 100 is mounted on the carriage 30, the film 104f is broken by the liquid introduction portion 6.The ink housed in the ink chamber 150 is supplied to the print head 5 of the printing apparatus 20 through the liquid introduction portion 6. As the ink is consumed in the ink chamber 150, air is introduced into the ink chamber 150 through an atmospheric air opening (not illustrated). A direction in which the liquid housing reservoir 100 is mounted on the carriage 30 of the printing apparatus 20 is established as a mounting direction MD. The mounting direction MD is also a direction in which the plate 120 is mounted on the carriage 30 of the printing apparatus 20. In the present embodiment, the mounting direction MD is the +Z direction. Two mutually perpendicular directions are designated first direction FD and second direction SD. First direction FD is a direction that includes a component of the mounting direction MD. In the present embodiment, first direction FD is the Z direction and second direction SD is the X direction. First direction FD is a direction substantially along a front surface 120fa of plate 120. The first FD direction is also defined as follows. For example, the first FD direction is a direction perpendicular to a virtual plane that includes the liquid supply hole 104°p. For example, the first FD direction is a direction in which the device-side terminal 490 of the printing apparatus 20 described below passes over a terminal 290 described below when the liquid housing reservoir 100 or plate 120 is mounted on the carriage 30. For example, the first FD direction is a direction orthogonal to a direction in which a plurality of device-side terminals 490 of the printing apparatus 20 are arranged. In other embodiments, when the front surface 120fa is inclined from the mounting direction MD, the first FD direction is a direction other than the mounting direction MD. Plate 120 is used for the liquid housing tank 100. In the present embodiment, as illustrated in FIG. 4, plate 120 is provided on the second wall 101wr of the liquid housing body 101. Details of plate 120 will be described later. Two protrusions, Pr1 and Pr2, are formed on the second wall 101wr. The protrusions Pr1 and Pr2 project in the -Y direction. A hole 122 and a notch 121 to receive the protrusions Pr1 and Pr2 are formed in plate 120, respectively. The hole 122 is formed in the center of an end portion of plate 120 on the side 104 of the liquid supply portion. The notch 121 is formed in the center of an end portion of plate 120 on a side opposite the liquid supply portion 104. When plate 120 is attached to the second wall 101wr, the protrusions Pr1 and Pr2 are inserted into the hole 122 and the notch 121, respectively. After inserting plate 120 into the second wall 101wr, the tips of the protrusions Pr1 and Pr2 are flattened. As a result, plate 120 is fixed to the second wall 101wr. The methods for fixing plate 120 to the second wall 101wr are not limited to the description above. In the present embodiment, when the liquid housing reservoir 100 is viewed from a direction perpendicular to the second wall 101wr in which the plate 120 is provided, the plate 120 is arranged such that the centerline of the liquid supply orifice 104p overlaps a first virtual line C1 described later. A contact portion cp, which will be described later, is not arranged on the centerline of the liquid supply orifice 104p. As illustrated in FIG. 3, the liquid housing reservoir 100 further includes a liquid sensing member 110. The liquid sensing member 110 is fixed to the liquid housing body 101. The liquid sensing member 110 is used when the printing apparatus 20 detects the remaining amount of ink in the liquid housing reservoir 100. For example, the liquid sensing member 110 may be a prism for optically detecting the remaining amount of ink, a piezoelectric element in which a piezoelectric body is sandwiched between two opposing electrodes, or two electrodes that detect the remaining amount of ink by a difference in resistance between the electrodes. The liquid sensing member 110 may not be provided. The details of board 120 will be described with reference to Figures 5 and 6. Figure 5 is a first diagram illustrating the configuration of board 120. Figure 6 is a second diagram illustrating the configuration of board 120. As illustrated in Figure 6, board 120 includes a base member 120bd, a plurality of terminals 290, a device 130, and wiring (not illustrated). Board 120 may include other components. The base member 120bd has a front surface 120fa and a rear surface 120fb. In the present embodiment, the front surface 120fa and the rear surface 120fb are flat surfaces. The base member 120bd may be made of a material forming a rigid substrate, a flexible substrate, or the like. The terminal 290 is formed from a conductor such as gold foil. In this disclosure, "surface" is defined as follows, for example. For example, "surface" refers to a surface of base member 120bd, which is oriented towards the apparatus-side terminals 490 (described below) when the liquid housing tank 100 or plate 120 is mounted on the printing apparatus 20. For example, "surface" refers to a surface of base member 120bd, on which the terminals 290 are formed, in addition to the surface oriented towards the apparatus-side terminals 490 (described below) when the liquid housing tank 100 or plate 120 is mounted on the printing apparatus 20. For example, "surface" refers to a surface of base member 120bd, which includes the contact portions cp described below. In the present embodiment, the "surface" refers to the front surface 120fa.In other embodiments, the "surface" refers to the front surface 120fa unless otherwise stated. As illustrated in FIG. 5, the plurality of terminals 290 includes a data terminal 210, a clock terminal 220, a power supply terminal 230, a reset terminal 240, and a ground terminal 250. Each of the terminals 210, 220, 230, 240, and 250 is coupled to the device 130. Each of the terminals 210 to 250 is electrically coupled to the device 130 through a wiring pattern layer and a through-hole. The wiring pattern layer is provided on the front surface 120fa and the rear surface 120fb of the base member 120bd. The through-hole is provided in the base member 120bd. Data terminal 210 is used to transmit and receive an SDA data signal between device 130 and printing apparatus 20. In this case, the "signal" refers to a change in voltage.The signals transmitted and received through the data terminal 210 include, for example, signals indicating various types of data stored in a storage unit 138 described later, signals controlled by a processing unit 136 described later and not stored in storage unit 138, and signals controlled by the main control unit 40 and a sub-control unit 50 of the printing apparatus 20 and not stored in storage unit 138. The clock terminal 220 is used to transmit a clock signal SCK from the printing apparatus 20 to device 130. The power supply terminal 230 is used to supply a power supply voltage VDD from the printing apparatus 20 to device 130. The reset terminal 240 is used to transmit a reset signal RST from the printing apparatus 20 to device 130.The ground terminal 250 is grounded through a terminal on the device side 450 (described later) of the printing device 20. The voltages supplied to the data terminal 210, clock terminal 220, power supply terminal 230, and reset terminal 240 are voltages that the device 130 is configured to receive during normal operation. The voltage ranges supplied to the respective terminals 210 to 240 are the same. In the present embodiment, these ranges are approximately 0 V to approximately 3.3 V.The voltages that device 130 is configured to receive during normal operation are, for example, voltages lower than a voltage used to drive printhead 5, voltages as high as the power supply voltage VDD, voltages lower than the withstand voltage of device 130, voltages at which device 130 is not damaged, or voltages at which device 130 does not malfunction. In this case, a test terminal used for shipping inspection is not included among the terminals 290 in this disclosure. The test terminal is a terminal that does not contact the device-side terminal 490 of the printing apparatus 20 when the fluid housing reservoir 100 is mounted on the printing apparatus 20. The test terminal does not form a contact portion cp described below. As illustrated in FIG. 5, terminals 210, 220, 230, 240, and 250 include cp contact portions arranged to make contact with the corresponding apparatus-side terminals 410, 420, 430, 440, and 450 among a plurality of apparatus-side terminals 490 of the coupling mechanism 400 in the printing apparatus 20 when the liquid housing reservoir 100 is mounted in housing section 4. The cp contact portion of data terminal 210 is also called the cpd data contact portion. The cp contact portion of clock terminal 220 is also called the cpc clock contact portion. The cp contact portion of power supply terminal 230 is also called the cpvd power supply contact portion. The cp contact portion of the 240 reset terminal is also called the cpr reset contact portion.The cp contact portion of the earth terminal 250 is also called the cpvs earth contact portion. The cp contact portions are regions that form part of terminals 210, 220, 230, 240, and 250, which are positioned to make contact with the appliance-side terminals 410, 420, 430, 440, and 450 when the liquid housing tank 100 is mounted in housing section 4, respectively. The cp contact portions are physical regions on a surface of the liquid housing tank 100. Plate 120 has the cpd data contact portion, the cpc clock contact portion, the cpvd power supply contact portion, the cpr reset contact portion, and the cpvs earth contact portion. The coupling between terminal 290 and the device-side terminal 490 of the printing device 20 will be described later.Terminals 290 and corresponding contact portions cp may include terminals other than the above terminals 210 to 250. Data terminal 210 is used to detect whether or not it is short-circuited with at least one of the clock terminal 220, the power supply terminal 230, and the reset terminal 240. Specifically, data terminal 210 is used to detect whether or not it is in a short-circuited state (described later) with at least one of the clock terminal 220, the power supply terminal 230, and the reset terminal 240. Data terminal 210 is also used to detect whether the liquid housing reservoir 100 is mounted on the printing apparatus 20. Specifically, data terminal 210 is used to detect whether the liquid housing reservoir 100 is in a completed assembly state (described later) or an incomplete assembly state (described later). Plate 120 is shown in a plan view in FIG. 5. As illustrated in FIG. 5, two orthogonal straight lines are designated first virtual line C1 and second virtual line C2. In the present embodiment, first virtual line C1 extends along the first direction FD, and second virtual line C2 extends along the second direction SD. In the present embodiment, two orthogonal straight lines substantially along surface 120fa of base member 120bd are designated first virtual line C1 and second virtual line C2. Let us imagine projecting the positions of all the cp contact portions of all the 290 terminals provided on the base member 120bd of the 120 board onto the second virtual line C2. In the present embodiment, the data contact portion cpd, the clock contact portion cpc, the power supply contact portion cpvd, the reset contact portion cpr, and the ground contact portion cpvs are projected onto the second virtual line C2.With respect to the projection positions of the cp contact portions onto the second virtual line C2, the projection position of the cpd data contact portion is set as swd, the projection position of the cpc clock contact portion is set as swc, the projection position of the cpvd power supply contact portion is set as swvd, the projection position of the cpr reset contact portion is set as swr, and the cpvs ground contact portion is set as swvs. The projection positions swd, swc, swvd, swr, and swvs indicate orthogonal projections obtained by perpendicularly projecting the respective cpd, cpc, cpvd, cpr, and cpvs contact portions onto the second virtual line C2. At this point, all cp contact portions are projected in different positions.The data contact portion (cpd), clock contact portion (cpc), power supply contact portion (cpvd), reset contact portion (cpr), and ground contact portion (cpvs) are arranged such that virtual lines parallel to the first virtual line (C1) pass through the respective cp contact portions and their projection positions on the second virtual line (C2) and are orthogonal to the second virtual line. The first virtual line (C1) passes through the midpoint (MP) between the two most distant projection positions along the second virtual line (C2) between the projection positions of all the cp contact portions.In the present embodiment, the first virtual line C1 passes through the midpoint MP between the projection position of the cpvs ground contact portion and the projection position of the contact portion, which is located further from the swvs projection position of the cpvs ground contact portion, between the swd, swc, swvd, and swr projection positions of the cpd data contact portion, the cpc clock contact portion, the cpvd power supply data contact portion, and the cpr reset contact portion. In the present embodiment, the first virtual line C1 passes through the midpoint between the swc projection position of the cpc clock contact portion and the swvs projection position of the cpvs ground contact portion. With respect to the first virtual line C1, a region of the base member 120bd of plate 120 on one side of the line is defined as a first region Rg1, and the other region of the base member 120bd on the other side of the line is defined as a second region Rg2. In the present embodiment, the first region Rg1 is a region on the -X direction side, which is the negative direction of the second SD direction, of the first virtual line C1, and the second region Rg2 is a region on the +X direction side, which is the positive direction of the second SD direction, of the first virtual line C1. The first region Rg1 can also be described as one of two regions of plate 120 that interpose the first virtual line C1, and the second region Rg2 is the other region of plate 120 that interposes the first virtual line C1. In other words, the first region Rg1 and the second region Rg2 are on either side of the first virtual line C1.Among all the cp contact portions, some cpa contact portions are located in the first region Rg1, and the remaining cpb contact portions are located in the second region Rg2. The cpa contact portions located in the first region Rg1 include the cpd data contact portion, the cpc clock contact portion, the cpvd power supply contact portion, and the cpr reset contact portion. The remaining cpb contact portions located in the second region Rg2 include the cpvs ground contact portion. The cpc clock contact portion, the cpd data contact portion, the cpr reset contact portion, and the cpvd power supply contact portion are located on one side of the first virtual line C1, and the cpvs ground contact portion is located on the other side.Some of the cpa contact portions are arranged in the first region Rg1, and the remaining cpb contact portions are arranged asymmetrically with respect to the first virtual line C1. None of the cp contact portions are provided in the first virtual line C1. The ground contact portion (cpvs) is located at the end of the plurality of cp contact portions in the +X direction, which is the positive direction of the second SD direction. Any cp contact portion among the clock contact portion (cpc), data contact portion (cpd), power supply contact portion (cpvd), and reset contact portion (cpr) is located at the end of the plurality of cp contact portions in the -X direction, which is the negative direction of the second SD direction. Such a cp contact portion is located in the outermost position on one side in the second SD direction among the plurality of cp contact portions. The ground contact portion (cpvs) is located in the outermost position on the other side in the second SD direction among the plurality of cp contact portions.A space Wa is defined as the space in a direction along the second virtual line C2 between the cpvs ground contact portion and the cp contact portion in the first region Rg1 that projects to the farthest position of the swvs projection position of the cpvs ground contact portion when projected onto the second virtual line C2. In the present embodiment, the space between the swc projection position of the cpc clock contact portion and the swvs projection position of the cpvs ground contact portion in the direction along the second virtual line C2 is established as Wa. In the present embodiment, a distance between the cp clock contact portion and the cpvs ground contact portion in the second SD direction is established as a distance Wa. The data contact portion (cpd), clock contact portion (cpc), power supply contact portion (cpvd), and reset contact portion (cpr) are preferably arranged away from the ground contact portion (cpvs). For example, a gap in the direction along the second virtual line C2 between the ground contact portion (cpvs) and the cp contact portion projected onto the second virtual line C2 at the position closest to the projection position (swvs) of the ground contact portion (cpvs) between the cp contact portions in the first region Rg1 is equal to or greater than Wa / 2.In the present embodiment, a space between the cpr reset contact portion located on the positive direction side of the second SD direction between the cpd, cpvd, cpr, and cpvd contact portions other than the cpvs ground contact portion in the first region Rg1, and the cpvs ground contact portion provided in the second region Rg2 in the second SD direction is equal to or greater than Wa / 2. For example, no cp contact portion coupled to device 130 is provided through terminal 290 between the cp contact portion projected at the position closest to the swvs projection position of the cpvs ground contact portion between the cp contact portions other than the cpvs ground contact portion in the first region Rg1 when projected onto the second virtual line C2, and the cpvs ground contact portion provided in the second region Rg2.In the present embodiment, no other cp contact portion is provided coupled to device 130 via terminal 290 between the cpr reset contact portion provided at the furthest position in the +X direction, which is the positive direction of the second SD address, in the first region Rg1, and the cpvs ground contact portion provided in the second region Rg2. The other cpd, cpc, cpvd, cpr contact portions and the cpvs ground contact portion arranged on board 120 are not provided on the first virtual line C1. At least one of the clock contact portions (cpc), power supply contact portions (cpvd), and reset contact portions (cpr) is arranged on board 120 to project over the second virtual line C2 between the swd projection position of the data contact portion (cpd) and the swvs projection position of the ground contact portion (cpvs). Preferably, any two or more cp contact portions from the clock contact portion (cpc), power supply contact portion (cpvd), and reset contact portion (cpr) are arranged on board 120 to project over the second virtual line C2 between the swd projection position of the data contact portion (cpd) and the swvs projection position of the ground contact portion (cpvs).In the present embodiment, the power supply contact portion cpvd and the reset contact portion cpr are arranged on board 120 so that they project onto the second virtual line C2 between the projection position swd of the data contact portion cpd and the projection position swvs of the ground contact portion cpvs. The data contact portion cpd is arranged on board 120 to project onto the second virtual line C2 between the projection positions of any two cp contact portions between the power supply contact portion cpvd, the reset contact portion cpr, and the clock contact portion cpc. Among the cp contact portions, the data contact portion cpd is not the contact portion projected onto the second virtual line C2 at the outermost position on the second virtual line C2. In the present embodiment, the data contact portion cpd is arranged to project onto the second virtual line C2 between the projection positions of the clock contact portion cpc and the power supply contact portion cpvd. One or both of the data contact portion cpd and the reset contact portion cpr are arranged on board 120 to project onto the second virtual line C2 between the projection position swvd of the power supply contact portion cpvd and the projection position swc of the clock contact portion cpc. The reset contact portion cpr is arranged so that its projection position swr onto the second virtual line C2 is adjacent to or near the projection position swvd of the power supply contact portion cpvd. In the present embodiment, the data contact portion cpd is arranged on board 120 to project onto the second virtual line C2 between the projection position swvd of the power supply contact portion cpvd and the projection position swc of the clock contact portion cpc.To state that two contact portions are "adjacent" or "close" to each other means that the contact portions are "adjacent" or "close" to each other among contact portions, that is, within the array of contact portions. This does not necessarily mean that the two contact portions are the closest to each other among contact portions, as long as no other contact portion lies directly between them. Other components that are not between the contact portions, such as terminals, may be arranged between the two contact portions that are "adjacent" or "close" to each other without departing from the scope of this disclosure. The cpvd power supply contact portion is arranged on board 120 so that its swvd projection position on the second virtual line C2 is adjacent to or close to the swd projection position of the cpd data contact portion. In the present embodiment, the clock contact portion (cpc) is arranged on board 120 to project onto the second virtual line (C2) at the position furthest from the projection position (swvd) of the ground contact portion (cpvs). Furthermore, the data contact portion (cpd), the power supply contact portion (cpvd), and the reset contact portion (cpr) are arranged to project, in that order, from the projection position (swc) of the clock contact portion (cpc) to the projection position (swvd) of the ground contact portion (cpvs) on the second virtual line (C2). The clock contact portion (cpc) is located at the end of the array of cp contact portions in the -X direction, which is the negative direction of the second SD address.The cp contact portions, other than the cpc clock contact portion, are arranged in the order of the cpd data contact portion, the cpvd power supply contact portion, and the cpr reset contact portion, from address -X, which is the negative address of the second SD address, to address +X, which is the positive address of the second SD address. The projection positions of the plurality of cp contact portions on the second virtual line C2 are arranged in the order of the cpc clock contact portion, the cpd data contact portion, the cpvd power supply contact portion, the cpr reset contact portion, and the cpvs ground contact portion, from address -X to address +X. The clock contact portion (cpc), data contact portion (cpd), power supply contact portion (cpvd), reset contact portion (cpr), and ground contact portion (cpvs) are arranged to form a plurality of rows. These rows are parallel to the second virtual line (C2) and perpendicular to the first virtual line (C1). In this embodiment, the plurality of cp contact portions are arranged to form two rows perpendicular to the first direction (FD), and the directions of the two rows are parallel to the second direction (SD). The two rows are separated along the first virtual line (C1) and the first virtual line (FD) in this embodiment. These two rows are designated as the first row (R1) and the second row (R2).The first row R1 consists of the clock contact portion (cpc), the power supply contact portion (cpvd), and the ground contact portion (cpvs). The second row R2 consists of the data contact portion (cpd) and the reset contact portion (cpr).The data contact portion cpd and the reset contact portion cpr forming the second row R2, and the clock contact portion cpc, the power supply contact portion cpvd and the ground contact portion cpvs forming the first row R1 are configured to form an arrangement called staggered in which the data contact portion cpd and the reset contact portion cpr forming the second row R2, and the clock contact portion cpc, the cpvd, the power supply contact portion cpvs and the ground contact portion cpvs forming the first row R1 are staggered so that the cp contact portions are not aligned in the direction of the first virtual line C1.Two cp contact portions on the base member 120bd, which project to be adjacent to each other when projected onto the second virtual line C2, are part of different rows. The cpd data contact portion and the cpvs ground contact portion are arranged in different rows. At least one cp contact portion between the cpc clock contact portion, the cpvd power supply contact portion, and the cpr reset contact portion is arranged so that it projects onto the second virtual line C2 between the swd projection position of the cpd data contact portion and the swvs projection position of the cpvs ground contact portion.In the present embodiment, the reset contact portion cpr and the power supply contact portion cpvd are arranged so that they project onto the second virtual line C2 between the projection position swd of the data contact portion cpd and the projection position swvs of the ground contact portion cpvs. In the present embodiment, the cp contact portions of the respective terminals 210 to 250 are arranged to form the first row R1 and the second row R2, but this disclosure is not limited to this. For example, the cp contact portions of the respective terminals 210 to 250 may be arranged to form three or four rows. Rows may also be formed by a single cp contact portion. The distance between the ground contact portion (cpvs) and the reset contact portion (cpr) is defined as a distance (Dan). The distance between the data contact portion (cpd) and the clock contact portion (cpc) is defined as a distance (Dbn). The distance between the data contact portion (cpd) and the ground contact portion (cpvs) is defined as a distance (Dcn). The distance between the data contact portion (cpd) and the reset contact portion (cpr) is defined as a distance (Ddn). The distance between the data contact portion (cpd) and the power supply contact portion (cpvd) is defined as a distance (Den). In this case, the distance (Dcn) is longer than the distance (Dbn). The distance (Dcn) is longer than the distance (Den). The distance (Dcn) is longer than the distance (Ddn). In the present embodiment, the distance (Dbn) is equal to the distance (Den).The distance between the cpd data contact portion and the cp contact portion furthest from the cpd data contact portion among the plurality of cp contact portions other than the cpvs ground contact portion is the Dbn distance and the Den distance. In this case, the Dan distance is longer than the Dbn distance and the Den distance. The clock contact portion (cpc), reset contact portion (cpr), and power supply contact portion (cpvd) are arranged adjacent to the data contact portion (cpd) to partially surround the data contact portion (cpd) between the data contact portion (cpd) and the ground contact portion (cpvs). By arranging the data contact portion (cpd) within a virtual circle (VCR) that passes through the clock contact portion (cpc), reset contact portion (cpr), and power supply contact portion (cpvd), the clock contact portion (cpc), reset contact portion (cpr), and power supply contact portion (cpvd) partially surround the data contact portion (cpd). A virtual line segment connecting the clock contact portion (cpc) and the data contact portion (cpd) is established as the first line segment (FL). A virtual line segment connecting the reset contact portion (cpr) and the data contact portion (cpd) is established as the second line segment (SL). A virtual line segment connecting the power supply contact portion (cpvd) and the data contact portion (cpd) is established as the third line segment (TL). In the first line segment (FL), there is no cp contact portion from any 290 terminal other than the clock contact portion (cpc) and the data contact portion (cpd). In the second line segment (SL), there is no cp contact portion from any 290 terminal other than the reset contact portion (cpr) and the data contact portion (cpd).In the third TL line segment, there is no cp contact portion of any 290 terminal other than the cpvd power supply contact portion and the cpd data contact portion. In the present embodiment, the five terminals 210 to 250 also have the same positional relationship as the contact portions described above, cpd, cpc, cpvd, cpr, and cpvs. That is, the data terminal 210, the clock terminal 220, the reset terminal 240, and the power supply terminal 230 are arranged in the first region, Rg1. The ground terminal 250 is arranged in the second region, Rg2. No other terminal 290, other than the clock terminal 220 and the data terminal 210, is arranged in the first line segment, FL. No other terminal 290, other than the reset terminal 240 and the data terminal 210, is arranged in the second line segment, SL. No other terminal 290, other than the power supply terminal 230 and the data terminal 210, is arranged in the third line segment, TL.As described above, data terminal 210 is used to detect whether or not data terminal 210 is shorted to clock terminal 220, reset terminal 240, and power supply terminal 250, and whether or not liquid housing reservoir 100 is mounted on the printing apparatus 20. At least a portion of the arrangement of the cp contact portions in this disclosure is defined to permit such detections. As illustrated in FIG. 6, the device 130 is configured to be provided on the base member 120bd. The device 130 includes a processing unit 136. In the present embodiment, the device 130 includes the processing unit 136 and a storage unit 138. The device 130 is molded (sealed) with resin 139. The device 130 can be mounted on the base member 120bd by another method. Processing unit 136 is configured by, for example, a circuit. Processing unit 136 is connected to terminals 210 through 250 and controls the input / output signals and voltages to and from terminals 210 through 250. Processing unit 136 may be a circuit that has an advanced arithmetic processing function, such as a CPU. Details of processing unit 136 will be described later. Storage unit 138 is configured with, for example, non-volatile memory such as flash memory. Storage unit 138 stores information concerning liquid housing tank 100. This information includes, for example, ink consumption, ink color, the manufacturing date of liquid housing tank 100, and identification information for liquid housing tank 100. In this embodiment, "1" through "4" are assigned as identification information to liquid housing tanks 100A through 100D, respectively. The configuration of trolley 30 and the manner in which the liquid housing tank 100 is mounted on trolley 30 shall be described with reference to FIG. 7A to 7C. FIG. 7A is a diagram illustrating the manner in which the liquid housing tank 100 is mounted on trolley 30. FIG. 7B is a first diagram illustrating the coupling mechanism 400. FIG. 7C is a second diagram illustrating the coupling mechanism 400. The carriage 30 includes the housing section 4 and the print head 5. The housing section 4 is arranged in the print head 5 and is configured to detachably mount a plurality of fluid housing reservoirs 100. A mounting chamber 65 is formed in the housing section 4 in which the fluid housing reservoir 100 is mounted. In the present embodiment, four mounting chambers 65 are provided, corresponding to the number of fluid housing reservoirs 100A to 100D. The print head 5 includes a plurality of nozzles and a plurality of piezoelectric elements. The print head 5 discharges ink droplets from each nozzle according to a voltage applied to each piezoelectric element to form dots on a printing medium PA. The housing section 4 is provided with the fluid introduction portion 6, the sub-control plate 500, and the coupling mechanism 400.The liquid inlet portion 6 is arranged in the print head 5 in the normal operating position of the printing system 1000. Ink is introduced into the print head 5 from the liquid supply orifice 104p of the liquid housing reservoir 100 through the liquid inlet portion 6. In the present embodiment, four liquid inlet portions 6 are provided, corresponding to the number of liquid housing reservoirs 100A to 100D. A plurality of subcontrol board terminals 510, 520, 530, 540, and 550 and the subcontrol unit 50 are mounted on the subcontrol board 500. When referring to the plurality of subcontrol board terminals 510, 520, 530, 540, and 550 without distinction, the reference sign 590 is used. The plurality of subcontrol board terminals 590 is provided for each mounting chamber 65.The plurality of subcontrol board terminals 590 is electrically coupled to the subcontrol unit 50 via wiring from the subcontrol board 500. The subcontrol unit 50 is configured as, for example, a trolley circuit, and performs control related to the liquid housing tank 100 in cooperation with the main control unit 40 illustrated in FIG.2. The liquid housing tank 100 is inserted in the MD mounting direction to be mounted onto the housing section 4 of the printing apparatus 20. The liquid housing tank 100 is extracted in the opposite direction to the MD mounting direction to be removed from the housing section 4. In this way, the liquid housing tank 100 is detachably mounted on the printing apparatus 20. When the liquid housing tank 100 is mounted on the housing section 4, the device 130 is electrically coupled to the main control unit 40 via terminals 290, the coupling mechanism 400, the sub-control board 500, and bus 46, as illustrated in FIG. 2. As illustrated in FIGS. 7B and 7C, the coupling mechanism 400 includes a terminal clamping portion 405 and a plurality of contact portion forming members 403 held by the terminal clamping portion 405. The coupling mechanism 400 is provided for each of the liquid housing tanks 100A to 100D, i.e., for each mounting chamber 65. As illustrated in FIG. 7B, the clamping portion of terminal 405 has a plurality of grooves 301. The contact-portion forming member 403 is conductive and elastic. The contact-portion forming member 403 fits into the groove 301. In the present embodiment, for each coupling mechanism 400, five contact-portion forming members 403 are provided, the number of which is equal to the number of terminals 290. As illustrated in FIG. 7B, when referring to the five contact-portion forming members 403 separately, the reference signs "403A", "403B", "403C", "403D", and "403E" are used. In the present embodiment, nine grooves 301 of the coupling mechanism 400 are provided and arranged at predetermined intervals. In contrast, the number of slits 301 can be set to be equal to the number of members forming contact portions 403. As illustrated in FIG. 7C, the contact-forming member 403 is electrically coupled to terminal 290 and subcontrol board terminal 590 of subcontrol board 500. A portion of the contact-forming member 403, oriented toward the mounting chamber side 65, forms the device-side terminal 490. The device-side terminal 490 includes a dcp contact portion of the device-side terminal 490, which must contact terminal 290. In the present embodiment, in the device-side terminal 490, a portion of the contact-forming member 403, oriented toward the mounting chamber side 65 and projecting closer toward the mounting chamber 65, contacts terminal 290 to form the dcp contact portion of the device-side terminal 490.The DCP contact portion of the device-side terminal 490 is not limited to the present embodiment. For example, terminal 290 may contact a portion of the device-side terminal 490 other than the portion protruding closest to the mounting chamber 65. A portion of the contact-forming member 403, protruding towards the sub-control plate 500, forms a relay terminal 439 that contacts the sub-control plate terminal 590. When referring to the appliance-side terminals 490 separately, the reference symbols "410", "420", "430", "440", and "450" ​​are used. When referring to the relay terminals 439 separately, the reference symbols "431", "432", "433", "434", and "435" are used. Appliance-side terminal 410 and relay terminal 431 are formed on contact-forming member 403A. Appliance-side terminal 420 and relay terminal 432 are formed on contact-forming member 403B. Appliance-side terminal 430 and relay terminal 433 are formed on contact-forming member 403C. Appliance-side terminal 440 and relay terminal 434 are formed on contact-forming member 403D. The device-side terminal 450 and the relay terminal 435 are formed on the contact portion forming member 403E.Appliance-side terminal 410 is also called the appliance-side data terminal. Appliance-side terminal 420 is also called the appliance-side clock terminal. Appliance-side terminal 430 is also called the appliance-side power supply terminal. Appliance-side terminal 440 is also called the appliance-side reset terminal. Appliance-side terminal 450 is also called the appliance-side ground terminal. The contact-forming member 403A electrically couples data terminal 210 and subcontrol board terminal 510. Appliance-side terminal 410 makes contact with data terminal 210, and relay terminal 431 makes contact with subcontrol board terminal 510. The contact-forming member 403B electrically couples clock terminal 220 and subcontrol board terminal 520. Appliance-side terminal 420 makes contact with clock terminal 220, and relay terminal 432 makes contact with subcontrol board terminal 520. The contact-forming member 403C electrically couples power supply terminal 230 and subcontrol board terminal 530. Appliance-side terminal 430 makes contact with power supply terminal 230, and relay terminal 433 It makes contact with the subcontrol board terminal 530.The contact-forming member 403D electrically couples the reset terminal 240 and the sub-control board terminal 540. The appliance-side terminal 440 makes contact with the reset terminal 240, and the relay terminal 434 makes contact with the sub-control board terminal 540. The contact-forming member 403E electrically couples the earth terminal 250 and the sub-control board terminal 550. The appliance-side terminal 450 makes contact with the earth terminal 250, and the relay terminal 435 makes contact with the sub-control board terminal 550. When the liquid housing tank 100 is mounted in the housing section 4, terminals 210, 220, 230, 240, and 250 make contact with the appliance-side terminals 410, 420, 430, 440, and 450 to become electrically coupled, respectively. The appliance-side terminals 410, 420, 430, 440, and 450 of the coupling mechanism 400 make contact with the subcontrol board terminals 590 on the subcontrol board 500 to become electrically coupled. The subcontrol board terminals 590 of the subcontrol board 500 are electrically coupled to the subcontrol unit 50 by wiring. Therefore, terminals 210, 220, 230, 240, and 250 are electrically coupled to the subcontrol unit 50. The positional relationships between the cp contact portions in the liquid housing reservoir 100 and the positional relationships between each cp contact portion and other elements, for example, the positional relationship with the first virtual line C1, apply similarly to the dcp contact portions of the device-side terminals 410 to 450. The arrangement of the cp contact portions in the liquid housing reservoir 100 is a mirror image of the arrangement of the dcp contact portions of the device-side terminals 490. As illustrated in FIG. 7B, the dcp contact portion of the device-side data terminal 410 is also referred to as the device-side data contact portion dcpd. The dcp contact portion of the device-side clock terminal 420 is also referred to as the device-side clock contact portion dcpc.The DCP contact portion of the appliance-side power supply terminal 430 is also called the DCPVD appliance-side power supply contact portion. The DCP contact portion of the appliance-side reset terminal 440 is also called the DCPR appliance-side reset contact portion. The DCP contact portion of the appliance-side ground terminal 450 is also called the DCPVS appliance-side ground contact portion. As illustrated in FIG. 7B, the coupling mechanism 400 is shown in a plan view. Two orthogonal straight lines are designated first virtual line C1 and second virtual line C2. In FIG. 7B, first virtual line C1 is a direction along the first direction FD, and second virtual line C2 is a direction along the second direction SD. In the present embodiment, two orthogonal straight lines substantially along the surface of the terminal clamping portion 405 are designated first virtual line C1 and second virtual line C2. The dcp contact portions of all device-side terminals of the coupling mechanism 400 are assumed to project onto the second virtual line C2. In the present embodiment, the device-side data contact portion dcpd corresponding to data terminal 210, the device-side clock contact portion dcpc corresponding to clock terminal 220, the device-side power supply contact portion dcpvd corresponding to power supply terminal 230, the device-side reset contact portion dcpr corresponding to reset terminal 240, and the device-side ground contact portion dcpvs corresponding to ground terminal 250 are assumed to project onto the second virtual line C2.With respect to the projection positions of the DCP contact portions of the device-side terminals onto the second virtual line C2, the projection position of the device-side data contact portion (DCPD) is set as swd, the projection position of the device-side clock contact portion (DCPC) is set as swc, the projection position of the device-side power supply contact portion (DCPVD) is set as swvd, the projection position of the device-side reset contact position (DCPR) is set as swr, and the projection position of the device-side ground contact portion (DCPVS) is set as swvs. The projection positions swd, swc, swvd, swr, and swvs indicate orthogonal projections obtained by perpendicularly projecting the DCP contact portions of the respective device-side terminals onto the second virtual line C2.In this way, the dcp contact portions of all device-side terminals are projected in different positions onto the second virtual line C2. The device-side data contact portion dcpd, the device-side clock contact portion dcpc, the device-side power supply contact portion dcpvd, the device-side reset contact portion dcpr, and the device-side ground contact portion dcpvs are projected in different positions.The device-side data contact portion (dcpd), clock contact portion (dcpc), power supply contact portion (dcpvd), reset contact portion (dcpr), and ground contact portion (dcpvs) are arranged so that the virtual lines in the direction of the first virtual line C1, passing through the dcp contact portions of the respective device-side terminals, are parallel to each other, rather than overlapping or crossing each other. The first virtual line C1 passes through the midpoint MP between the two most distant projection positions of the dcp contact portions of all device-side terminals onto the second virtual line C2.In the present embodiment, the first virtual line C1 passes through the midpoint MP between the projection position swvs of the ground contact portion on the dcpvs apparatus side over the second virtual line C2 and the projection position of the contact portion disposed at the furthest point of the projection position swvs of the ground contact portion on the dcpvs apparatus side between the projection positions swd, swc, swvd, and swr of the data contact portion on the dcpd apparatus side, the clock contact portion on the dcpc apparatus side, the power supply contact portion on the dcpvd apparatus side, and the reset contact portion on the dcpr apparatus side.In the present embodiment, the first virtual line C1 passes through the midpoint between the projection position swc of the clock contact portion of the dcpc apparatus side onto the second virtual line C2 and the projection position swvs of the ground contact portion of the dcpvs apparatus side. With respect to the first virtual line C1, one region of the coupling mechanism 400 on one side of the line is established in a first region Rg1, and the other region of the coupling mechanism 400 on the other side of the line is established in a second region Rg2. In this case, the device-side terminals 410, 420, 430, and 440 are arranged in the first region Rg1, and the device-side terminals 450 are arranged in the second region Rg2. In the present embodiment, the first region Rg1 is a region on the -X direction side (the negative direction of the second SD direction) from the first virtual line C1, and the second region Rg2 is a region on the +X direction side (the positive direction of the second SD direction) from the first virtual line C1.The first region, Rg1, is one of the two regions of the 400 coupling mechanism that interpose the first virtual line, C1, and the second region, Rg2, is the other region of the 400 coupling mechanism that interposes the first virtual line, C1. In other words, the first region, Rg1, and the second region, Rg2, are on either side of the first virtual line, C1. Among the dcp contact portions of all the device-side terminals, some dcpa ​​contact portions are arranged in the first region, Rg1, and the remaining dcpb contact portions are arranged in the second region, Rg2. The dcpa ​​contact portions arranged in the first region, Rg1, include the device-side data contact portion, dcpd, the device-side clock contact portion, dcpc, the device-side power supply contact portion, dcpv, and the device-side reset contact portion, dcpr.The remaining dcpb contact portions arranged in the second Rg2 region include the device-side dcpv ground contact portion. The device-side dcpc clock contact portion, device-side dcpd data contact portion, device-side dcpr reset contact portion, and device-side dcpvd power supply contact portion are arranged on one side of the first virtual line C1, and the device-side ground contact portion is arranged on the other side. Some dcpa ​​contact portions and the remaining dcpb contact portions are arranged asymmetrically with respect to the first virtual line C1. No device-side dcp contact portion is provided on the first virtual line C1. As illustrated in FIG. 7B, the ground portion of the device side dcpv is arranged at the end of the dcp contact portion array of the device-side plurality of terminals in the +X direction, which is the positive direction of the second SD direction. The dcp contact portion of any device-side terminal between the device-side clock portion dcpc, the device-side data portion dcpd, the device-side power supply portion dcpvd, and the device-side reset portion dcpr is arranged at the end of the dcp contact portion array of the device-side plurality of terminals in the -X direction, which is the negative direction of the second SD direction.The dcp contact portion of said device-side terminal is located in a more external position in the second SD direction between the dcp contact portions of the plurality of device-side terminals. The dcpvs device-side ground contact portion is also located in a more external position in the second SD direction between the dcp contact portions of the plurality of device-side terminals, on the other side of the contact portion array. A space between the dcp contact portion projected at the furthest point of the swvs projection position when projected onto the second virtual line C2 between the dcp contact portions of the device-side terminals in the first region Rg1, and the dcpvs device-side ground contact portion provided in the second region Rg2 in the direction along the second virtual line C2, is established as Wa. The device-side data contact portion (dcpd), clock contact portion (dcpc), power supply contact portion (dcpd), and reset contact portion (dcpr) are preferably arranged away from the device-side ground contact portion (dcpvs). For example, the gap between the projected dcp contact portion at the position closest to the swvs projection position when projected onto the second virtual line C2 between the device-side 490 terminals in the first region Rg1, and the device-side ground contact portion (dcpvs) provided in the second region Rg2 along the second virtual line C2, is equal to or greater than Wa / 2.For example, no dcp contact portion of another device-side terminal is provided between the dcp contact portion of the device-side terminal projected at the position closest to the swvs projection position when projected onto the second virtual line C2 between the dcp contact portions of the device-side terminals in the first region Rg1, and the dcpvs device-side ground contact portion provided in the second region Rg2. In the present embodiment, no dcp contact portion of another device-side terminal is provided in a region between the dcpr device-side reset contact portion provided at the end on the +X direction side (the positive direction of the second SD direction) of the contact portion array in the first region Rg1 and the dcpvs device-side ground contact portion provided in the second region Rg2.For example, none of the dcp contact portions of the appliance-side terminals 410 to 440 and the appliance-side ground contact portion are provided on the first virtual line C1. The dcp contact portion of at least one device-side terminal between the dcpc device-side clock contact portion, the dcpvd device-side power supply contact portion, and the dcpr device-side reset contact portion is arranged to project over the second virtual line C2 between the swd projection position of the dcpd device-side data contact portion and the swvs projection position of the dcpvs device-side ground contact portion.Preferably, the two or more device-side dcp contact portions between the device-side dcpc clock contact portion, the device-side dcpvd power supply contact portion, and the device-side dcpr reset contact portion are arranged to project over the second virtual line C2 between the projection position swd of the device-side dcpd data contact portion and the projection position swvs of the device-side dcpvs ground contact portion. The device-side data terminal dcpd is arranged to project onto the second virtual line C2 between the projection positions of the dcp contact portions of any two device-side terminals between the device-side clock contact portion dcpc, the device-side power supply contact portion dcpvd, and the device-side reset contact portion dcpr. The device-side data contact portion dcpd does not project to a position at the end of the array of projection positions on the second virtual line C2. In the present embodiment, the device-side data contact portion dcpd is arranged to project onto the second virtual line C2 between the projection positions of the device-side clock contact portion dcpc and the device-side power supply contact portion dcpvd. One or both of the data contact portion on the dcpd device side and the reset contact portion on the dcpr device side are arranged to project onto the second virtual line C2 between the swvd projection position of the dcpvd device side power supply contact portion and the swc projection position of the dcpc device side clock contact portion. Furthermore, the dcpr device side reset contact portion is arranged so that its swr projection position on the second virtual line C2 is adjacent to or near the swvd projection position of the dcpvd device side power supply contact portion.In the present embodiment, the data contact portion on the dcpd device side is arranged to project onto the second virtual line C2 between the projection position swvd of the power supply contact portion on the dcpvd device side and the projection position swc of the clock contact portion on the dcpc device side. The power supply contact portion on the dcpr device side is arranged so that its projection position swvd on the second virtual line C2 is adjacent to or close to the projection position swd of the data contact portion on the dcpd device side. In the present embodiment, the clock contact portion on the dcpc device side is arranged to project onto the second virtual line C2 at the position furthest from the swvs projection position of the ground contact portion on the dcpvs device side. The data contact portion on the dcpd device side, the power supply contact portion on the dcpvd device side, and the reset contact portion on the dcpr device side are arranged to project onto the second virtual line C2 in that order, in a direction from the swc projection position of the clock contact portion on the dcpc device side to the swvs projection position of the ground contact portion on the dcpvs device side on the second virtual line C2.The clock contact portion on the dcpc device side is located at the end of the contact portion array on the second virtual line C2 in the -X direction (the negative direction of the second SD address). The dcp contact portions of the device-side terminals other than the clock contact portion on the dcpc device side are arranged in the order of the dcpd device-side data contact portion, the dcpvd device-side power supply contact portion, and the dcpr device-side reset contact portion from the -X direction (the negative direction of the second SD address) to the +X direction (the positive direction).The projection positions of the dcp contact portions of the device-side plurality of terminals on the second virtual line C2 are arranged in the order of the device-side clock contact portion dcpc, the device-side data contact portion dcpd, the device-side power supply contact portion dcpvd, and the device-side reset contact portion dcpr, and the device-side ground contact portion dcpvs from the -X direction to the +X direction. The clock contact portion on the device side (dcpc), the data contact portion on the device side (dcpd), the power supply contact portion on the device side (dcpvd), the reset contact portion on the device side (dcpr), and the ground contact portion on the device side are arranged to form a plurality of rows. These rows are parallel to the second virtual line C2 and perpendicular to the first virtual line C1. In this embodiment, the dcp contact portions of the plurality of device-side terminals are arranged to form two rows perpendicular to the first direction FD, and the directions of the two rows are parallel to the second direction SD. The two rows are separated in the direction along the first virtual line C1 and the direction along the first direction FD in this embodiment.The two rows are designated first row R1 and second row R2. First row R1 consists of the clock contact portion on the DCPC side of the device, the power supply contact portion on the DCPVD side of the device, and the ground contact portion on the DCPVS side of the device. Second row R2 consists of the data contact portion on the DCPD side of the device and the reset contact portion on the DCPR side of the device.The data contact portion on the dcpd device side and the reset contact portion on the dcpr device side forming the second row R2, the clock contact portion on the dcpc device side, the power supply contact portion on the dcpvd device side, and the ground contact portion on the dcpvs device side forming the first row R1 are configured to form a staggered arrangement in which the data contact portion on the dcpd device side and the reset contact portion on the dcpr device side forming the second row R2, the clock contact portion on the dcpc device side, the power supply contact portion on the dcpvd device side, and the ground contact portion on the dcpvs device side forming the first row R1 are staggered so that the dcp contact portions are not aligned in the direction of the first virtual line C1.The DCP contact portions of two device-side terminals whose projection positions on the second virtual line C2 are adjacent form parts of different rows. The device-side data contact portion (DCPD) and the device-side ground contact portion (DCPVS) are arranged in different rows. The DCP contact portion of any device-side terminal between the device-side clock contact portion (DCPC), the device-side power supply contact portion (DCPVD), and the device-side reset contact portion (DCPR) is arranged to project onto the second virtual line C2 between the projection position (SWD) of the device-side data contact portion (DCPD) and the projection position (SWVS) of the device-side ground contact portion (DCPVS).In the present embodiment, the dcpr device-side reset contact portion and the dcpvd device-side power supply contact portion are arranged to project onto the second virtual line C2 between the swd projection position of the dcpd device-side data contact portion and the swvs projection position of the dcpvs device-side ground contact portion. In the present embodiment, the dcp contact portions of the respective device-side terminals 410 to 450 are arranged to form the first row R1 and the second row R2, but this disclosure is not limited to this. For example, the dcp contact portions of the respective device-side terminals 410 to 450 may be arranged to form rows such as three or four rows. A row may also be formed by the dcp contact portion of a device-side terminal. The distance between the ground contact portion on the DCPV device side and the reset contact portion on the DCPR device side is defined as a distance DAn. The distance between the data contact portion on the DCPD device side and the clock contact portion on the DCPC device side is defined as a distance DBn. ​​The distance between the data contact portion on the DCPD device side and the ground contact portion on the DCPVS device side is defined as a distance DCn. The distance between the data contact portion on the DCPD device side and the reset contact portion on the DCPR device side is defined as a distance DDn. The distance between the data contact portion on the DCPD device side and the power supply contact portion on the DCPVD device side is defined as a distance DEn. In this case, the distance DCn is longer than the distance DBn.The distance DCn is longer than the distance DEn. The distance DCn is longer than the distance DDn. In the present embodiment, the distance DBn is equal to the distance DEn. A distance between the device-side data contact portion dcpd and the device-side dcp contact portion farthest from the device-side data contact portion dcpd among the dcp contact portions of the plurality of device-side terminals other than the device-side ground contact portion dcpvs is the distance DBn and the distance DEn. In this case, the distance DAn is longer than the distance DBn and the distance DEn. A virtual line segment connecting the clock contact portion on the DCPC device side and the data contact portion on the DCPD device side is established as the first line segment FL. A virtual line segment connecting the reset contact portion on the DCPR device side and the data contact portion on the DCPD device side is established as the second line segment SL. A virtual line segment connecting the power supply contact portion on the DCPVD device side and the data contact portion on the DCPD device side is established as the third line segment TL. In the first line segment FL, there is no DCP contact portion from any device-side terminal other than the clock contact portion on the DCPC device side and the data contact portion on the DCPD device side.In the second SL line segment, there is no DCP contact portion on any device-side terminal other than the device-side reset DCPR contact portion and the device-side data DCPD contact portion. In the third TL line segment, there is no DCP contact portion on any device-side terminal other than the device-side power supply DCPVD contact portion and the device-side data DCPD contact portion. The data terminal 210 may also be referred to as the first terminal. The clock terminal 220 may also be referred to as the second terminal included among other terminals. The reset terminal 240 may also be referred to as the third terminal included among other terminals. The power supply terminal 230 may also be referred to as the fourth terminal included among other terminals. The ground terminal 250 may also be referred to as the fifth terminal included among other terminals. The data contact portion (cpd) may also be referred to as the first contact portion. The clock contact portion (cpc) may also be referred to as the second contact portion. The reset contact portion (cpr) may also be referred to as the third contact portion. The power supply contact portion (cpvd) may also be referred to as the fourth contact portion. The ground contact portion (cpvs) may also be referred to as the fifth contact portion.Terminals other than the first terminal may also be referred to as another group of terminals. Terminals provided on plate 120 and liquid housing tank 100, such as terminals 210 to 250, may also be referred to as plate-side terminals or tank-side terminals. Device-side terminal 410 may also be called the first device-side terminal. Device-side terminal 420 may also be called the second device-side terminal. Device-side terminal 430 may also be called the third device-side terminal. Device-side terminal 440 may also be called the fourth device-side terminal. Device-side terminal 450 may also be called the fifth device-side terminal. The projection position of the first device-side terminal 410 onto the second virtual line C2 may be called the first projection position. The projection position of the second device-side terminal 420 may be called the second projection position. The projection position of the third device-side terminal 430 may be called the third projection position.The projection position of the fourth terminal on the device side 440 may be called the fourth projection position. The projection position of the fifth terminal on the device side 450 may be called the fifth projection position. A2. Description of various states of the printing system: In this disclosure, a "completed assembly state" means a state in which the liquid housing reservoir 100 is mounted on the printing apparatus 20 and no short circuit occurs between terminals 290. As described above, in this disclosure, the statement that "the liquid housing reservoir 100 is mounted on the printing apparatus 20" means that the liquid housing reservoir 100 is physically attached to the printing apparatus 20 and the cp contact portion of terminal 290 is electrically coupled to the apparatus-side terminal 490. The completed assembly state is a state in which communication between the printing apparatus 20 and device 130 is possible.A "not fully assembled" state means a state in which the liquid housing reservoir 100 is not mounted in the housing section 4 of the printing apparatus 20, or a state in which the liquid housing reservoir 100 is attached to the housing section 4 of the printing apparatus 20, but poor contact occurs between the device-side terminal 490 and the contact part cp. A "short-circuited state" means a state in which the liquid housing reservoir 100 is mounted in the housing section 4 of the printing apparatus 20, but a short circuit has occurred between terminals 290. For example, a case in which the data terminal 210 is short-circuited with the clock terminal 220 means that "the data terminal 210 and the clock terminal 220 are in a short-circuited state." A "coupling state" is any one of (i) the completed assembly state, (ii) the incomplete assembly state, and (iii) the short-circuited state. "Determining the coupling state" means determining which of the states (i) through (iii) described above the liquid storage tank 100 is in. A3. Electrical configuration and software configuration: A3-1. Electrical configuration: Figure 8 is a schematic diagram illustrating the electrical configuration of the printing system 1000. In Figure 8, to distinguish the plates 120 and devices 130 from the four liquid housing tanks 100A, 100B, 100C, and 100D, the letters "A," "B," "C," and "D" are appended. Devices 130A through 130D store identification information for the respective liquid housing tanks 100A through 100D. For example, devices 130A through 130D store information related to the liquids housed in the respective liquid housing tanks 100A through 100D. This identification information is represented by ID = 1 to 4 in Figure 8. The main control unit 40 and the sub-control unit 50 form a control unit 39 that controls the operation of the printing apparatus 20. The subcontrol unit 50 is electrically coupled to the liquid housing tanks 100A through 100D via multiple lines. These lines include an LRST reset line, an LSCK clock line, an LVDD power supply line, an LSDA data line, and an LVSS ground line. The LRST reset line, LSCK clock line, LVDD power supply line, and LSDA data line are provided independently for each of the liquid housing tanks 100A through 100D. The LVSS ground line is commonly provided for all liquid housing tanks 100A through 100D. When it is intended to distinguish the lines electrically coupled to the corresponding liquid housing tanks 100A to 100D with respect to the LRST reset line, the LSCK clock line, the LVDD power supply line, and the LSDA data line, "1" to "4" are added at the end."1" to "4" correspond to the identification information pieces "1" to "4" of the liquid housing tanks 100A to 100D. In subcontrol unit 50, a terminal that outputs the reset signal RST is designated as a host terminal HRST. A terminal that outputs the clock signal SCK is designated as a host terminal HSCK. A terminal that outputs a power supply voltage VDD is designated as a host terminal HVDD. A terminal that outputs and inputs the data signal SDA is designated as a host terminal HSDA. A host terminal HVSS is grounded. To distinguish the terminals connected to the corresponding liquid housing tanks 100A to 100D from the host terminals HSDA, HRST, HSCK, and HVDD, "1" through "4" are appended to the end. "1" through "4" correspond to the identification information pieces "1" through "4" of the liquid housing tanks 100A to 100D. Subcontrol unit 50 is electrically coupled to the main control unit 40 via bus 46.The subcontrol unit 50 individually transmits various signals and voltages to devices 130A to 130D of the liquid housing tanks 100A to 100D via a coupling bus 45 that includes lines LRST, LSCK, LVDD, LSDA and LVSS. The LRST reset line is a conductive line used when control unit 39 transmits the RST reset signal to device 130. The RST reset signal creates a device state where it can receive an RS request signal, which will be described later. When the RST reset signal transmitted to device 130 by control unit 39 changes from a high level to a low level, a portion of processing unit 136, which receives the RS request signal, enters an initial state. When the RST reset signal changes from a low level to a high level, it is enabled to receive a new RS request signal. The LSCK clock line is a conductive line used when control unit 39 transmits the SCK clock signal to device 130. The SCK clock signal alternates between low and high levels in a predetermined cycle.The LSDA data line is a conductive line used to transmit and receive the SDA data signal between control unit 39 and device 130. The SDA data signal is transmitted and received in synchronization with the SCK clock signal to synchronize the control unit 39 and device 130. For example, the SDA data signal is transmitted and received using the rising or falling edge of the SCK clock signal as a trigger. The RST reset signal, the SDA data signal, and the SCK clock signal each assume a high or low level. In the following description, the high level is represented by the reference symbol "H" or "1," and the low level is represented by the reference symbol "L" or "0." The HSDA host terminal connected to the LSDA data line is grounded at subcontrol unit 50 through a pull-down resistor.Therefore, when the SDA data signal is not being transmitted / received between subcontrol unit 50 and device 130, the HSDA host terminal drive state in subcontrol unit 50 is held at a low level. The LVSS ground line is a conductive line used to define a ground potential (VSS) for device 130. The VSS ground potential is set to, for example, 0 V. The LVDD power supply line is a conductive line used when the control unit 39 supplies the power supply voltage (VDD) as an operating voltage to device 130. The VDD power supply voltage is higher than a predetermined threshold value. In this embodiment, a potential of, for example, approximately 3.3 V with respect to the VSS ground potential is used as the VDD power supply voltage. The potential used for the VDD power supply voltage may have a different value depending on the type of device 130. Figure 9 is a diagram illustrating the functional configuration of the printing apparatus 20 together with a liquid housing tank 100. The printing apparatus 20 includes a display panel 495, a power supply 441, the main control unit 40, and the sub-control unit 50. The display panel 495 is used to notify a user of the operating status of the printing apparatus 20, errors in the liquid housing tanks 100A to 100D, the ink consumption stored in the device 130, the ink color, the manufacturing date, and similar information.When the liquid housing tank 100 is in the completed assembly state, for example, a display informing the user that the liquid housing tank 100 is mounted, a display indicating that the printing system 1000 is in a printable state, and a display of the remaining amount of ink housed in the liquid housing tank 100 are displayed on the display panel 495. The display panel 495 is provided, for example, in operating portion 70 of FIG. 2. The power supply 441 is a general-purpose power supply used in a logic circuit and is rated at 3.3 V. The voltage from the power supply 441 is supplied to the subcontrol unit 50 and also to other circuits as required. The main control unit 40 includes a CPU 415 and a first appliance-side storage unit 416. The CPU 415 controls the operation of the printing apparatus 20 by executing various programs stored in the first appliance-side storage unit 416. For example, the main control unit 40 controls the operation of the display panel 495 and the sub-control unit 50. The CPU 415 functions as a determination unit 411, executing various programs stored in the first appliance-side storage unit 416. The determination unit 411 includes a mounting determination unit 412 and a short-circuit determination unit 414. The mounting determination unit 412 determines whether the liquid housing tank 100 is mounted or not. The short-circuit determination unit 414 determines whether a short circuit has occurred between the terminals 290. Subcontrol unit 50 includes a switching unit 511 and a second appliance-side storage unit 516. The switching unit 511 includes a register (not shown) and an analog switch (not shown) coupled to the register. When CPU 415 writes "1" to the register, the analog switch enters a conducting state. Therefore, it is possible to change the state to one in which CPU 415 and board 120 are coupled. When CPU 415 writes "0" to the register, the analog switch enters a non-conducting state. Therefore, it is possible to change the state to one in which CPU 415 and board 120 are not coupled. The second storage unit on the device side 516 stores determination information. Determination information is information used in the coupling state determination processing described later. This information is information where the voltage emitted from data terminal 210 in response to the RS request signal described later is set to a detected value. Determination unit 411 reads the determination information from the second storage unit on the device side 516 when performing the coupling state determination processing. Subcontrol unit 50 transmits the RS request signal to devices 130A to 130D of the liquid holding tanks 100A to 100D via coupling bus 45. The RS request signal is emitted from the HSDA host terminal of subcontrol unit 50 and input to data terminal 210 of each of the liquid holding tanks 100A to 100D. The RS request signal includes a command to enable the identification of the liquid holding tanks 100A to 100D as a target for responding to the RS request signal, for each of the devices 130A to 130D. The determination unit 411 performs the coupling state determination processing of the liquid housing tanks 100A to 100D using the voltage emitted from the data terminal 210 of each of the liquid housing tanks 100A to 100D in response to the RS request signal.Details of the RS request signal will be described later. The processing unit 136 of device 130 communicates with the printing apparatus 20 via the LSDA data line, synchronized with the SCK clock signal sent from the printing apparatus 20 to clock terminal 220. For example, a signal is transmitted / received triggered by the rising or falling edge of the SCK clock signal. The processing unit 136 controls the input / output signals and voltages to / from terminals 210 to 250. For example, the FS and SS response signals are sent to data terminal 210 and then via the LSDA data line in response to the RS request signal. The processing unit 136 includes a three-state buffer. The three-state buffer has three drive states: a low-level voltage output state, a high-level voltage output state, and a high-impedance state.The three-state buffer is coupled to data terminal 210. Therefore, in this disclosure, "low level," "high level," and "high impedance" are used as terms indicating the operating state of data terminal 210. Storage unit 138 includes a memory cell array in which a plurality of memory cells are arranged in a two-dimensional array. Processing unit 136 and storage unit 138 are coupled by a bit line and a word line. Processing unit 136 is electrically coupled to each of terminals 210 through 250 and storage unit 138. A3-2. Software configuration scheme (coupling state determination processing): The coupling state determination process performed by the printing system 1000 will be described with reference to FIG. 10A and 10B. FIG. 10A is a flowchart illustrating a process executed by the printing apparatus 20 in the coupling state determination process for a device 130. FIG. 10B is a flowchart illustrating a process executed by the device 130 in the coupling state determination process. As illustrated in FIG. 10A, in the coupling status determination process, the printing device 20 executes the following steps. In step S301, the subcontrol unit 50 transmits a request signal RS to device 130 of the liquid housing tank 100. The subcontrol unit 50 then detects a voltage output from data terminal 210 of the liquid housing tank 100. Specifically, in step S302, the subcontrol unit 50 detects the voltage emitted from data terminal 210 of the liquid housing tank 100 at a predetermined first time interval t1. In step S303, the subcontrol unit 50 detects the voltage emitted from data terminal 210 of the liquid housing tank 100 at a predetermined second time interval t2.In step S304, the subcontrol unit 50 detects the voltage emitted from the data terminal 210 of the liquid housing tank 100 at a predetermined third time interval t3. Time intervals t1 to t3 are different. The voltages detected by the subcontrol unit 50 at time intervals t1 to t3 are stored as detected values ​​in the second appliance-side storage unit 516 of the subcontrol unit 50. In step S305, the determination unit 411 of the main control unit 40 reads the detected value from the second appliance-side storage unit 516. In step S306, the main control unit 40 determines the coupling status based on the detected values ​​obtained by the subcontrol unit 50 at time intervals t1 to t3. As illustrated in FIG. 10B, in the docking status determination process, device 130 performs the following steps. In step S101, the processing unit 136 of device 130 determines whether the RS request signal is being sent from the printing device 20 to the data terminal 210. Upon determining that the RS request signal is being sent to the data terminal 210, the processing unit 136 of device 130 determines whether a response has been requested from the printing device 20 in step S102. Upon determining whether a response has been requested from the printing device 20, the processing unit 136 of device 130 sends a first response signal FS to the data terminal 210 in step S103. After sending the first response signal FS, the processing unit 136 of device 130 sends a second response signal SS to the data terminal 210 in step S104.The first response signal FS and the second response signal SS are emitted from data terminal 210 to printing device 20. When it is determined in step S102 that no response is requested from printing device 20, the processing unit 136 of device 130 terminates the processes. The timing scheme and output of the RS request signal, the first FS response signal, and the second SS response signal are described with reference to Figures 11A through 11D. Figure 11A is a timing diagram for when the printing device 20 sends the RS request signal to the data terminal 210. Figure 11B is a timing diagram for when device 130 sends the first FS response signal and the second SS response signal to the data terminal 210. Figure 11C is a diagram illustrating the details of the first FS response signal. Figure 11D is a diagram illustrating the details of the second SS response signal. The timing diagram in Figure 11B follows the timing diagram in Figure 11A. In FIG.11A to 11D, "H" indicates that the signal is at a high level, and "L" indicates that the signal is at a low level.The dotted line indicates that the drive state of terminal 290 is high impedance, meaning no signal is being output from terminal 290. The host terminal HSDA of subcontrol unit 50 is grounded through the pull-down resistor. Therefore, control unit 39 cannot distinguish between a case where the drive state of terminal 290 is high impedance and no signal is output from terminal 290 and a case where a low-level voltage is output from terminal 290. For example, when a pull-up resistor is used to connect data terminal 210 and power supply terminal 230, the drive state of data terminal 290 is recognized as high impedance. VDD, RST, SCK, and SDA1 to SDA4 are illustrated in FIG.11A and similar designations signify signals transmitted and received through the corresponding terminal 290, or voltages supplied by the corresponding lines LVDD, LRST, LSCK, and LSDA1 to LSDA4. Cycles D1 to D9 in a CMT command period, a first response period RT1, and a second response period RT2 represent a unit period in which the low and high levels of the SCK clock signal are repeated in each period. The SCK clock signal in this unit period is called a "cycle." The timing diagrams illustrated in FIGS. 11A and 11B are executed using a predetermined timing event as the trigger. The predetermined timing event is, for example, a timing event in which the printing unit 20 is activated and the power supply 441 is switched on, a timing event in which the fluid housing reservoir 100 is replaced, a timing event in which a user instruction is received, and a timing event in which the printing unit 20 is not printing and the carriage 30 is in a home position. An example of execution triggered by the timing event in which the power supply 441 is switched on will be described below. As illustrated in FIG. 11A, control unit 39 first sets the power supply voltage VDD to a high level. Control unit 39 then switches the reset signal RST from a low level to a high level after a predetermined time has elapsed since the power supply voltage VDD reached a high level. Control unit 39 transmits the clock signal SCK to device 130 after switching the reset signal RST to a high level. Control unit 39 then transmits the request signal RS to device 130 after switching the reset signal RST to a high level. The RS request signal includes a first execution command BCC1, first identification data DB1, first parity data P1, a second execution command BCC2, second identification data DB2, and second parity data P2. The RS request signal will be described in detail. After changing the RST reset signal to a high level, control unit 39 transmits the first execution command, BCC1, to devices 130A through 130D during cycles D1 and D2 of the CMT command period. The first execution command, BCC1, is a 2-bit data command that instructs the main control unit 40 to perform the coupling state determination processing. Control unit 39 generates the first execution command, BCC1, by setting the voltage to a high level during cycle D1 and to a low level during cycle D2. Control unit 39 transmits the first identification data, DB1, to devices 130A through 130D in cycles D3 through D8, after the first execution command, BCC1. This first identification data, DB1, consists of 6 bits and is used to identify the liquid housing tanks 100A through 100D that require a response. In this first identification data, the corresponding bits are assigned to each of the devices 130A through 130D. Cycle D3, which is the first bit, and cycle D4, which is the second bit, can be used when six liquid housing tanks 100 are mounted on the printing apparatus 20 in another embodiment.In the first DB1 identification data, the third bit (cycle D5) corresponds to liquid housing tank 100D, the fourth bit (cycle D6) corresponds to liquid housing tank 100C, the fifth bit (cycle D7) corresponds to liquid housing tank 100B, and the sixth bit (cycle D8) corresponds to liquid housing tank 100A. The first DB1 identification data transmitted to device 130A from liquid housing tank 100A is high in the sixth bit (cycle D8), and the remaining bits are low. The first DB1 identification data transmitted to device 130B from liquid housing tank 100B is high in the fifth bit (cycle D7), and the remaining bits are low.The first DB1 identification data transmitted to device 130C of liquid housing tank 100C is high in cycle D6 (the fourth bit), and the remaining bits are low. The first DB1 identification data transmitted to device 130D of liquid housing tank 100D is high in cycle D5 (the third bit), and the remaining bits are low. The RS request signal has a different waveform for each of the devices 130A through 130D of liquid housing tanks 100A through 100D. After the initial identification data DB1, control unit 39 transmits the initial parity data P1 to devices 130A through 130D in cycle D9. The initial parity data P1 is 1-bit data. In the present embodiment, the initial parity data P1 is odd parity. After the first parity data (P1), control unit 39 transmits the second 2-bit execution command (BCC2) to devices 130A through 130D. The second execution command (BCC2) is the same data as the first execution command (BCC1), but not inverted. After the second execution command (BCC2), control unit 39 transmits the second 6-bit identification data (DB2) to devices 130A through 130D. The second identification data (DB2) is the same data as the first identification data (DB1), but not inverted. After the second identification data (DB2), control unit 39 transmits the second 1-bit parity data (P2) to devices 130A through 130D. The first execution command BCC1, the first identification data DB1, and the first parity data P1 are collectively referred to as the first command. The second execution command BCC2, the second identification data DB2, and the second parity data P2 are collectively referred to as the second command. A period during which control unit 39 transmits the first command to device 130 in the CMT command period is also referred to as the first command period. A period during which control unit 39 transmits the second command to device 130 in the CMT command period is also referred to as the second command period. The first and second commands are not reversed and contain the same data. In other embodiments, the first and second commands may be reversed. As described above, in device 130, the power supply voltage VDD is first applied from the printing unit 20 to the power supply terminal 230. A high reset voltage is then applied from the printing unit 20 to the reset terminal 240. In device 130, the power supply voltage VDD is applied from the printing unit 20 to the power supply terminal 230, and then the reset signal RST changes from a low reset voltage to a high reset voltage. In device 130, after the high reset voltage is applied from the printing unit 20 to the reset terminal 240, the clock signal SCK is applied to the clock terminal 220 from the printing unit 20.In device 130, after the high reset voltage from the printing unit 20 is input to the reset terminal 240, the RS request signal is input to the data terminal 210 from the printing unit 20. In this case, the power supply voltage VDD is a voltage with a high level above a threshold value. The reset signal RST is a signal containing a low reset voltage as a low level and a high reset voltage as a high level higher than the low reset voltage. The low reset voltage is a voltage lower than a reference reset voltage threshold value. The high reset voltage is a voltage higher than the reference reset voltage threshold value. The reference reset voltage is a voltage that serves as a reference for determining a high and a low level.The SCK clock signal is a signal in which a low clock voltage (low level) and a high clock voltage (high level, higher than the low clock voltage) alternate in a predetermined cycle. The low clock voltage is lower than a reference clock voltage (threshold value). The high clock voltage is higher than the reference clock voltage (threshold value). The reference clock voltage is a voltage used to determine a high and a low level. Each threshold value is set, for example, between the potential of power supply 441 and ground. As illustrated in FIG. 11B, after the RS request signal is transmitted from control unit 39 to device 130, device 130, requested to respond to the printing apparatus 20, emits the first response signal FS and the second response signal SS to the data terminal 210. The first response signal FS and the second response signal SS are used when the printing apparatus 20 determines that the data terminal 210 is not short-circuited with the clock terminal 220, the power supply terminal 230, and the reset terminal 240, and that the liquid housing tank 100 is mounted on the printing apparatus 20. The RS request signal has a waveform to individually designate the liquid housing tanks 100A to 100D in the first identification data DB1.Upon receiving the RS request signal designating the corresponding device from the printing unit 20, devices 130A to 130D transmit the first response signal FS and the second response signal SS to data terminal 210. The first response signal FS is transmitted during the first response period RT1. The second response signal SS is transmitted during the second response period RT2, which is the period immediately following the first response period RT1. In the first RT1 response period, specifically in cycles D1 and D2, the address switching process is performed for the signals transmitted and received by the printing unit 20 via the LSDA data line. After transmitting the RS request signal to device 130, control unit 39 discharges the LSDA data line, setting its potential to 0 V in cycle D1. Then, control unit 39 sets the host terminal HSDA's drive state in sub-control unit 50 to high impedance in cycle D2. This puts the printing unit 20 into a state where signal input is possible. Upon receiving the RS request signal synchronized with the SCK clock signal, processing unit 136 of device 130 sets the drive state of each data terminal 210 to high impedance in cycle D1.This is to prevent an output signal from data terminal 210 while the loads on the LSDA data line are being discharged by control unit 39 of the printing apparatus 20. Similarly, in cycle D2, processing unit 136 of device 130 sets the drive state of data terminal 210 to high impedance. The first two bits in the first RT1 response period also function as dummy bits to make the number of bits in the first RS request signal command equal to the number of bits in the first RT1 response period. The number of SCK clock signal cycles that make up the first RT1 response period is equal to the number of SCK clock signal cycles synchronized with the first RS request signal command. Next, in cycles D3 to D8, the processing unit 136 of each device 130 sends the first FS response signal to data terminal 210 at a predetermined time. The first FS response signal is sent from different processing units 136A to 136D for each cycle of the SCK clock signal. The first FS response signal includes a low-level voltage. As illustrated in FIG. 11C, the first response signal FS is a signal emitted to data terminal 210 during the period when the SCK clock signal is high. The first response signal FS is low during the period when the SCK clock signal is high. The processing unit 136 of device 130 emits a low-level voltage to data terminal 210 when the voltage applied to clock terminal 220 changes from low to high. As described above, the first FS response signal includes a first low response voltage, which is lower than the first reference response voltage, which serves as the threshold value. The first reference response voltage is a voltage that acts as a reference for determining a low and a high level, and is set, for example, between the power supply voltage 441 and the ground potential voltage. As illustrated in FIG. 11B, the first timing t1 is set during a period in which the SCK clock signal is high in each of the D5 to D8 cycles of the first RT1 response period. The first timing t1 is set during a period in which the first FS response signal is low. As illustrated in FIG. 11C, device 130 outputs a low-level voltage to data terminal 210 starting before the first timing t1 and continuing until the first timing t1, during a period in which the SCK clock signal is high in one cycle of the SCK clock signal. As illustrated in FIG. 11B, the D9 cycle of the first RT1 response period functions as a dummy bit to make the number of bits in the first command period and the number of bits in the first RT1 response period equal to each other. In the second RT2 response period, as illustrated in FIG. 11B, control unit 39 discharges loads on the LSDA data line, setting its potential to 0 V in cycle D1. Processing unit 136 of device 130 sets the drive state of data terminal 210 to high impedance. Also, in cycle D2, processing unit 136 of device 130 sets the drive state of data terminal 210 to high impedance. The first two bits in the second RT2 response period also function as dummy bits to ensure that the number of bits in the second RS request signal command and the number of bits in the second RT2 response period are equal. The number of SCK clock signal cycles that make up the second RT2 response period is equal to the number of SCK clock signal cycles synchronized with the second RS request signal command. Next, in cycles D5 through D8, the processing unit 136 of each device 130 sends the second SS response signal to data terminal 210 at a predetermined time. The second SS response signal is sent from different processing units 136A through 136D for each cycle of the SCK clock signal. The second SS response signal includes a low-level voltage and a high-level voltage. As illustrated in Figure 11D, the waveform of the second SS response signal is out of phase with the waveform of the SCK clock signal input to clock terminal 220. The second SS response signal is high during a period when the SCK clock signal is low, and low during a period when the SCK clock signal is high. As described above, the second response signal (SS) includes a second low response voltage as a low level and a second high response voltage as a high level higher than the second low response voltage. The second low response voltage is lower than the second reference response voltage as a threshold value, and the second high response voltage is higher than the second reference response voltage as a threshold value. The second reference response voltage is a voltage that serves as a reference for determining a low level and a high level, and is set, for example, between the power supply voltage 441 and the ground potential voltage. The second reference response voltage may be the same as or different from the first reference response voltage. The waveform of the second response signal (SS) is different from the waveform of the first response signal (FS). As illustrated in FIG. 11B, the second timing t2 is set during a period in which the SCK clock signal is low in each of the D5 to D8 cycles of the second RT2 response period. The second timing t2 is set during a period in which the second SS response signal is high. The third timing t3 is set during a period in which the SCK clock signal is high in each of the D5 to D8 cycles of the second RT2 response period. The third timing t3 is set during a period in which the second SS response signal is low. As illustrated in FIG. 11D, device 130 outputs a high-level voltage to data terminal 210 starting before the second timing t2 and continuing until the second timing t2 during a period in which the SCK clock signal is low in one cycle of the SCK clock signal.Device 130 outputs a low-level voltage to data terminal 210 starting before the third timing t3 and continuing until the third timing t3 for a period of one high level in one cycle of the SCK clock signal. As illustrated in FIG.11B, the D9 cycle of the second RT2 response period functions as dummy bit data to make the number of bits in the second command period and the number of bits in the second RT2 response period equal to each other. The output periods of the first response signal (FS) and the second response signal (SS) are different for each of the devices 130A to 130D of the liquid housing tanks 100A to 100D. In the present embodiment, device 130 emits the first response signal (FS) and the second response signal (SS) in one cycle of the SCK clock signal corresponding to the identification information. As illustrated in FIG. 11B, liquid housing tank 100A emits the first response signal (FS) and the second response signal (SS) to data terminal 210 in each cycle D8 of the first response period RT1 and the second response period RT2. Liquid housing tank 100B emits the first response signal (FS) and the second response signal (SS) to data terminal 210 in each cycle D7 of the first response period RT1 and the second response period RT2.Liquid housing tank 100C sends the first FS response signal and the second SS response signal to data terminal 210 in each D6 cycle of the first RT1 response period and the second RT2 response period. Liquid housing tank 100D sends the first FS response signal and the second SS response signal to data terminal 210 in each D5 cycle of the first RT1 response period and the second RT2 response period. As illustrated in FIG. 11B, after the SCK clock signal, which has a predetermined number of cycles, is input to clock terminal 220, device 130 switches the drive state of data terminal 210 from high impedance to low and outputs the first FS response signal. For example, as illustrated in FIG. 11B, after the SCK clock signal is input to clock terminal 220 during cycles D1 to D7 in the first RT1 response period, device 130A switches the drive state of data terminal 210 from high impedance to low and outputs the first FS response signal. Then, device 130 switches the drive state of data terminal 210 from low to high impedance and completes the output of the first FS response signal. For example, as illustrated in FIG.11B, device 130A emits the first FS response signal in cycle D8 during the first RT1 response period, and then switches the drive state of data terminal 210 to high impedance. Therefore, device 130A completes the emission of the first FS response signal. As illustrated in FIG. 11B, after the SCK clock signal, which has a predetermined number of cycles, is input to clock terminal 220, device 130 switches the drive state of data terminal 210 from high impedance to high and outputs the second response signal SS. For example, as illustrated in FIG. 11B, after the SCK clock signal is input to clock terminal 220 during cycles D1 to D7 in the second response period RT2, device 130A switches the drive state of data terminal 210 from high impedance to high and outputs the second response signal SS. Then, device 130 switches the drive state of data terminal 210 from low to high impedance and ends the transmission of the second response signal SS. For example, as illustrated in FIG.11B, device 130A emits the second SS response signal in cycle D8 during the second RT2 response period, and then switches the drive state of data terminal 210 from low to high impedance. Therefore, device 130A completes the emission of the second SS response signal. As described above, device 130 outputs the first response signal FS to data terminal 210 after the RS request signal is input to data terminal 210. Device 130 then outputs the second response signal SS to data terminal 210. Device 130 performs the following actions when data terminal 210 is not shorted to clock terminal 220, power supply terminal 230, and reset terminal 240. As illustrated in FIG. 11C, device 130 outputs the first low response voltage as the first expected value to data terminal 210 at a predetermined first time t1 during a period when the voltage input to clock terminal 220 is a high clock voltage. As illustrated in FIG.11D, once device 130 outputs the first low response voltage, device 130 outputs the second high response voltage as a second expected value to data terminal 210 in a second timing interval t2 in which the voltage applied to clock terminal 220 is a low clock voltage. As illustrated in FIG. 11D, once device 130 outputs the second high response voltage, device 130 outputs the second low response voltage as a third expected value to data terminal 210 in a third timing interval t3 in which the voltage applied to clock terminal 220 is a high clock voltage. The first FS response signal is set to a low level. The low level of the first FS response signal indicates that data terminal 210 is not short-circuited with terminals 220, 230, 240, and 250 other than data terminal 210. The second SS response signal is set to a high level and a low level. The high level of the second SS response signal indicates that the liquid housing reservoir 100 is mounted on the printing apparatus 20. The low level of the second SS response signal indicates that data terminal 210 is not short-circuited with terminals 220, 230, 240, and 250 other than data terminal 210. A3-3. Software configuration details (coupling state determination processing): The coupling state determination process performed by the main control unit 40 will be described with reference to FIG. 12. FIG. 12 is a diagram illustrating a schematic of the coupling state determination process performed by the main control unit 40. As illustrated in FIG. 12, the main control unit 40 determines the coupling state using a combination of the voltages emitted from the data terminal 210 of the liquid housing tank 100 at the first timing interval t1 to the third timing interval t3. The first timing interval t1 to the third timing interval t3 are mapped to the periods of cycles D5 to D8 according to the liquid housing tanks 100A to 100D as described above with reference to FIG. 11B.The expected voltage output from data terminal 210 of the liquid housing tank 100 at each of the first timing intervals t1 through t3 is the voltage output from data terminal 210 when the liquid housing tank 100 is in the completed assembly state. The expected value is a low level at the first timing interval t1, a high level at the second timing interval t2, and a low level at the third timing interval t3. In the first case where the voltage output from data terminal 210 of the liquid housing tank 100 is equal to the expected value, the determination unit 411 of the main control unit 40 determines that the liquid housing tank 100 is in the completed assembly state and therefore determines "tank provided." In a second case where the voltage output from data terminal 210 of the liquid housing tank 100 is low at each of the first timing interval t1 through the third timing interval t3, the determination unit 411 of the main control unit 40 determines that the liquid housing tank 100 is in the incomplete assembly state and therefore determines "no tank". Strictly speaking, the voltage output from data terminal 210 of the liquid housing tank 100 would also be low at each of the first timing interval t1 through the third timing interval t3 if data terminal 210 and ground terminal 250 were shorted.However, as discussed earlier, the contact portions cpd and cpvs are arranged to make such a short circuit unlikely. Therefore, it is reasonable to assume in the second case that no deposit is present, and thus "no deposit" is determined. Similarly, the low level of the first response signal FS and the low level of the second response signal SS in the first case indicate that data terminal 210 is not shorted to ground terminal 250. In a third case where the voltage emitted from the data terminal 210 of the liquid housing tank 100 has a high level at the first timing t1, a low level at the second timing t2 and a high level at the third timing t3, the determination unit 411 of the main control unit 40 determines that the data terminal 210 and the clock terminal 220 are in the short-circuit state, and therefore determines "that a short circuit has occurred". When data terminal 210 and clock terminal 220 are shorted, the voltage at data terminal 210 becomes substantially equal to the voltage at clock terminal 220. Similar to the clock signal SCK in FIG. 11B, the voltage output from data terminal 210 of the liquid housing tank 100 is high at the first timing t1, low at the second timing t2, and high at the third timing t3.As described above, when data terminal 210 and clock terminal 220 are shorted between data terminal 210, power supply terminal 230, reset terminal 240, and clock terminal 220, the output voltage, from data terminal 210 coupled to device 130, to the control unit 39 of the printing apparatus 20 during the first timing interval t1 through the third timing interval t3, is configured as follows. The output voltage from data terminal 210 differs from the first expected value in the first timing interval t1, from the second expected value in the second timing interval t2, and from the third expected value in the third timing interval t3. In a fourth case, where the voltage emitted from the data terminal 210 of the liquid housing tank 100 is high during each of the first timing interval t1 through the third timing interval t3, the determination unit 411 of the main control unit 40 determines at least one of the following: that the data terminal 210 and the power supply terminal 230 are in a short-circuited state, and that the data terminal 210 and the reset terminal 240 are in a short-circuited state, and therefore determines "that a short circuit has occurred." When the data terminal 210 and the power supply terminal 230 are short-circuited, or when the data terminal 210 and the reset terminal 240 are short-circuited, the voltage at the data terminal 210 becomes substantially equal to the voltage at the power supply terminal 230 or the voltage at the reset terminal 240. As illustrated in FIG.11B, in the first response period RT1 and the second response period RT2, the power supply terminal 230 and the reset terminal 240 are at a high level. Therefore, the voltage emitted from the data terminal 210 of the liquid housing tank 100 is at a high level in each of the first timing t1 to the third timing t3.As described above, in at least one case where data terminal 210 and power supply terminal 230 are shorted, and in one case where data terminal 210 and reset terminal 240 are shorted, the voltage output between data terminal 210, power supply terminal 230, reset terminal 240, and clock terminal 220, from data terminal 210 coupled to device 130 during the first timing interval t1 through the third timing interval t3, to the control unit 39 of the printing apparatus 20, is configured as follows. The voltage output from data terminal 210 is different from the first expected value in the first timing interval t1, equal to the second expected value in the second timing interval t2, and different from the third expected value in the third timing interval t3. As described above, the printing device 20 first detects that the data terminal 210 is not short-circuited with terminals 220, 230, 240, and 250 other than data terminal 210, during the first timing step t1. In this state, the printing device 20 detects that the liquid housing tank 100 is mounted on the printing device 20, during the second timing step t2. Furthermore, the printing device 20 again checks that the data terminal 210 is not short-circuited with terminals 220, 230, 240, and 250 other than data terminal 210, during the third timing step t3. By detecting the voltages emitted from data terminal 210 during the first timing step t1 through the third timing step t3, it is verified that the liquid housing tank 100 is in the fully assembled state.As described later, a case is also considered where a short circuit occurs between data terminal 210 and the other terminals 220, 230, 240, and 250 within the first response period RT1 and the second response period RT2. By detecting that data terminal 210 is not short-circuited with the other terminals 220, 230, 240, and 250, in the first timing interval t1 before the second timing interval t2 and in the third timing interval t3 after the second timing interval t2, it is verified with high accuracy that the liquid housing tank 100 is in the completed assembly state. As described above, the assembly detection mechanism and a short-circuit detection mechanism between the terminals 290 in the liquid housing tank 100 are recognized as independent components. When the printing device 20 detects that data terminal 210 and clock terminal 220 are not short-circuited, it is necessary to be able to distinguish the voltage detected by the printing device 20 when data terminal 210 and clock terminal 220 are short-circuited from the voltage detected by the printing device 20 when data terminal 210 and clock terminal 220 are not short-circuited. One cycle of the SCK clock signal has a low-level period and a high-level period. When data terminal 210 and clock terminal 220 are not short-circuited, device 130 outputs a high-level voltage to data terminal 210 during the low-level period of the cycle. However, device 130 also outputs a high-level voltage even when data terminal 210 and clock terminal 220 are short-circuited.As a result, the printing device 20, which detects the output from data terminal 210, might have difficulty determining whether data terminal 210 and clock terminal 220 are shorted. To prevent this, device 130 outputs a different voltage from the SCK clock signal voltage to data terminal 210 during timing intervals t1 through t3. This allows the printing device 20 to distinguish the voltage detected when data terminal 210 and clock terminal 220 are shorted from the voltage detected when they are not. This applies similarly to a case where data terminal 210 and power supply terminal 230 are shorted and a case where data terminal 210 and reset terminal 240 are shorted. Specific examples of the coupling state determination processing will be described with reference to Figures 13A to 20B. In the first through ninth specific examples described below, a liquid housing tank 100A will be used as an example. In the second through ninth specific examples, the waveforms illustrated in Figures 13A to 20B schematically illustrate an example of the voltage at terminal 290, as actually observed. The control unit 39 recognizes the voltage emitted from data terminal 210 as either a high or a low level, based on a predetermined threshold value. First specific example In the first specific example, a case will be described where the liquid housing tank 100A is in the completed assembly state. FIG. 13A is a first timing diagram illustrating the docking state determination process. FIG. 13B is a second timing diagram illustrating the docking state determination process. As illustrated in FIG. 13A, subcontrol unit 50 transmits the RS request signal to device 130A of the liquid housing tank 100A during the CMT command period. The RS request signal transmitted to device 130A has a high level on bit D8 of cycle in order to designate the liquid housing tank 100A as the target. As illustrated in FIG.13B, in the completed assembly state, the subcontrol unit 50 detects, from the data terminal 210, a low level at the first timing t1 in cycle D8 in the first response period RT1, a high level at the second timing t2 in cycle D8 in the second response period RT2, and a low level at the third timing t3 in cycle D8 in the second response period RT2. In this case, the determination unit 421 of the main control unit 40 determines "deposit is provided" for the liquid housing tank 100A at timings t1 through t3 because the expected value is equal to the detected value. Second specific example In a second specific example, the coupling state determination processing will be described when a short circuit occurs between data terminal 210 and clock terminal 220. Figure 14A is a third timing diagram illustrating the coupling state determination processing. Figure 14B is a fourth timing diagram illustrating the coupling state determination processing. In Figure 14A, a short circuit is assumed to occur between data terminal 210 and clock terminal 220 of the 100A liquid housing tank at a time ta before the CMT command period. As illustrated in Figure 14B, the change in the voltage output from data terminal 210 is the same as that of the signal from clock terminal 220.Subcontrol unit 50 detects, from data terminal 210, a high level in the first timing step t1 of cycle D8 in the first response period RT1, a low level in the second timing step t2 of cycle D8 in the second response period RT2, and a high level in the third timing step t3 of cycle D8 in the second response period RT2. In this case, data terminal 210 and clock terminal 220 are in a short-circuit state, and therefore the determination unit 411 of the main control unit determines that "a short circuit has occurred." Third specific example. In a third specific example, the coupling state determination processing will be described when a short circuit occurs between data terminal 210 and clock terminal 220. This third specific example differs from the second specific example in that device 130 receives the RS request signal, and then a short circuit occurs between data terminal 210 and clock terminal 220. Figure 15 is a fifth timing diagram illustrating the coupling state determination processing. It assumes that a short circuit occurs between data terminal 210 and clock terminal 220 of the 100A liquid housing tank at a timing tb of the first response period RT1. In this case, the signal emitted from data terminal 210 is the same as the signal from clock terminal 220.Therefore, the subcontrol unit 50 detects, from the data terminal 210, a high level in the first timing t1 of cycle D8 in the first response period RT1, a low level in the second timing t2 of cycle D8 in the second response period RT2, and a high level in the third timing t3 of cycle D8 in the second response period RT2. In this case, with respect to the liquid holding tank 100A, the data terminal 210 and the clock terminal 220 are in a short-circuit state, and therefore the determination unit 411 of the main control unit 40 determines "that a short circuit has occurred." Fourth specific example In a fourth specific example, the coupling state determination processing will be described when a short circuit occurs between data terminal 210 and power supply terminal 230. Figure 16A is a sixth timing diagram illustrating the coupling state determination processing. Figure 16B is a seventh timing diagram illustrating the coupling state determination processing. In Figures 16A and 16B, a short circuit is assumed to occur between data terminal 210 and power supply terminal 230 of the 100A liquid housing tank at timing ta before the CMT command period. As illustrated in Figure 16B, the change in the voltage output from data terminal 210 is the same as that of the signal from power supply terminal 230.Subcontrol unit 50 detects, from data terminal 210, a high level in the first timing t1 of cycle D8 in the first response period RT1, a high level in the second timing t2 of cycle D8 in the second response period RT2, and a high level in the third timing t3 of cycle D8 in the second response period RT2. In this case, with respect to the liquid holding tank 100A, data terminal 210 and power supply terminal 230 are in a short-circuit state, and therefore the determination unit 411 of the main control unit 40 determines "that a short circuit has occurred". Fifth specific example In a fifth specific example, the coupling state determination processing will be described when a short circuit occurs between data terminal 210 and power supply terminal 230. This fifth specific example differs from the fourth specific example in that device 130 receives the RS request signal, and then a short circuit occurs between data terminal 210 and power supply terminal 230. Figure 17 is an eighth timing diagram illustrating the coupling state determination processing. It assumes that a short circuit occurs between data terminal 210 and power supply terminal 230 of the 100A liquid housing tank at timing tb of the first response period RT1. In this case, the signal emitted from data terminal 210 is the same as the signal from power supply terminal 230.Therefore, the sub-control unit 50 detects, from the data terminal 210, a high level in the first timing t1 of cycle D8 in the first response period RT1, a high level in the second timing t2 of cycle D8 in the second response period RT2, and a high level in the third timing t3 of cycle D8 in the second response period RT2. In this case, with respect to the liquid holding tank 100A, the data terminal 210 and the power supply terminal 230 are in a short-circuit state, and therefore the determination unit 411 of the main control unit 40 determines "that a short circuit has occurred." Sixth specific example In a sixth specific example, the coupling state determination processing will be described when a short circuit occurs between data terminal 210 and reset terminal 240. FIG. Figure 18A is a ninth timing diagram illustrating the coupling state determination process. Figure 18B is a tenth timing diagram illustrating the coupling state determination process. In Figures 18A and 18B, a short circuit is assumed to occur between data terminal 210 and reset terminal 240 of the 100A liquid housing tank at timing ta before the CMT command period. As illustrated in Figure 18B, the change in the voltage output from data terminal 210 is the same as that of the signal from reset terminal 240.Therefore, the sub-control unit 50 detects, from the data terminal 210, a high level at the first timing step t1 of cycle D8 in the first response period, a high level at the second timing step t2 of cycle D8 in the second response period, and a high level at the third timing step t3 of cycle D8 in the second response period. In this case, with respect to the liquid holding tank 100A, the data terminal 210 and the reset terminal 240 are in a short-circuit state, and therefore the determination unit 411 of the main control unit 40 determines that "a short circuit has occurred." Seventh specific example In a seventh specific example, the coupling state determination processing will be described when a short circuit occurs between data terminal 210 and reset terminal 240. The seventh specific example differs from the sixth specific example in that device 130 receives the RS request signal, and then a short circuit occurs between data terminal 210 and reset terminal 240. Figure 19 is an eleventh timing diagram illustrating the coupling state determination processing. It assumes that a short circuit occurs between data terminal 210 and reset terminal 240 of the 100A liquid housing tank at timing tb of the first RT1 response period. In this case, the signal emitted from data terminal 210 is the same as the signal from reset terminal 240.Therefore, the sub-control unit 50 detects, from the data terminal 210, a high level at the first timing step t1 of cycle D8 in the first response period, a high level at the second timing step t2 of cycle D8 in the second response period, and a high level at the third timing step t3 of cycle D8 in the second response period. In this case, with respect to the liquid holding tank 100A, the data terminal 210 and the reset terminal 240 are in a short-circuit state, and therefore the determination unit 411 of the main control unit 40 determines that "a short circuit has occurred." Eighth specific example In an eighth specific example, a case will be described where the 100A liquid housing tank is in the completed assembly state. More specifically, in the eighth specific example, a case will be described where the 100A liquid housing tank is removed from housing section 4 before device 130A receives the RS request signal. Figure 20A is a twelfth timing diagram illustrating the coupling state determination process. When the 100A liquid housing tank is not mounted in housing section 4, the drive state of the HSDA1 host terminal of subcontrol unit 50 becomes low due to the pull-down resistor.Therefore, subcontrol unit 50 detects a low level at the first timing t1 of cycle D8 in the first response period RT1, a low level at the second timing t2 of cycle D8 in the second response period RT2, and a low level at the third timing t3 of cycle D8 in the second response period RT2. In this case, the liquid holding tank 100A is in the incomplete assembly state, and therefore, the determination unit 421 of the main control unit 40 determines "no tank". Ninth specific example In a ninth specific example, a case will be described in which the liquid housing tank 100A is removed from the housing section 4 during the first response period RT1. Figure 20B is a thirteenth timing diagram illustrating the coupling state determination process. The subcontrol unit 50 detects a low level at the first timing t1 of cycle D8 in the first response period RT1, a low level at the second timing t2 of cycle D8 in the second response period RT2, and a low level at the third timing t3 of cycle D8 in the second response period RT2. In this case, the liquid housing tank 100A is in the incomplete assembly state, and therefore the determination unit 421 of the main control unit 40 determines "no tank." Other specific examples In other specific examples, various coupling states and the determination results of the determination unit 421 for the respective coupling states will be described. Figure 20C is a diagram illustrating other specific examples of coupling state determination processing. In coupling state determination processing, when at least one of the values ​​detected at the first timing step t1 and the third timing step t3 differs from the expected value, the determination unit 411 of the main control unit 40 determines that "a short circuit has occurred." One case in No. 1 refers to a case where the data terminal 210 and the clock terminal 220 are short-circuited at a timing step t before the first timing step t1.In this case, board 120 emits, from data terminal 210 to printing device 20, a high-level voltage different from the first expected value in the first timing interval t1, a low-level voltage different from the second expected value in the second timing interval t2, and a high-level voltage different from the third expected value in the third timing interval t3. In this case, the determination unit 411 determines "that a short circuit has occurred". One case in No. 2 refers to a case in which data terminal 210 and clock terminal 220 are short-circuited at a time t before the second time t2 after the first time t1. In this case, board 120 outputs, from data terminal 210 to the printing apparatus 20, a low-level voltage equal to the first expected value at the first time t1, a low-level voltage different from the second expected value at the second time t2, and a high-level voltage different from the third expected value at the third time t3. In this case, the determination unit 411 determines "that a short circuit has occurred." One case in No. 3 refers to a case where data terminal 210 and clock terminal 220 are short-circuited at a timing t before the third timing t3 after the second timing t2. In this case, board 120 outputs, from data terminal 210 to the printing apparatus 20, a low-level voltage equal to the first expected value at the first timing t1, a high-level voltage equal to the second expected value at the second timing t2, and a high-level voltage different from the third expected value at the third timing t3. In this case, the determination unit 411 determines "that a short circuit has occurred." One case in No. 4 refers to a case in which a short circuit between data terminal 210 and clock terminal 220 is cleared at a timing interval t before the second timing interval t2 after the first timing interval t1. In this case, board 120 outputs, from data terminal 210 to the printing apparatus 20, a high-level voltage different from the first expected value at the first timing interval t1, a high-level voltage equal to the second expected value at the second timing interval t2, and a low-level voltage equal to the third expected value at the third timing interval t3. In this case, the determination unit 411 determines "that a short circuit has occurred." One case in No. 5 refers to a case in which a short circuit between data terminal 210 and clock terminal 220 is cleared at a timing interval t before the third timing interval t3 after the second timing interval t2. In this case, board 120 outputs, from data terminal 210 to the printing apparatus 20, a high-level voltage different from the first expected value at the first timing interval t1, a low-level voltage different from the second expected value at the second timing interval t2, and a low-level voltage equal to the third expected value at the third timing interval t3. In this case, the determination unit 411 determines "that a short circuit has occurred." One case of No. 6 refers to at least one instance where data terminal 210 and power supply terminal 230 are short-circuited at a time t before the first time t1, and one instance where data terminal 210 and reset terminal 240 are short-circuited at a time t before the first time t1. In this instance, board 120 outputs, from data terminal 210 to the printing apparatus 20, a high-level voltage different from the first expected value at the first time t1, a high-level voltage equal to the second expected value at the second time t2, and a high-level voltage different from the third expected value at the third time t3. In this instance, the determination unit 411 determines "that a short circuit has occurred." One case in No. 7 refers to at least one instance where data terminal 210 and power supply terminal 230 are short-circuited at time t before the second time t2 after the first time t1, and one instance where data terminal 210 and reset terminal 240 are short-circuited at time t before the second time t2 after the first time t1. In this instance, board 120 outputs, from data terminal 210 to the printing apparatus 20, a low-level voltage equal to the first expected value at the first time t1, a high-level voltage equal to the second expected value at the second time t2, and a high-level voltage different from the third expected value at the third time t3. In this instance, the determination unit 411 determines that "a short circuit has occurred." One case of No. 8 refers to at least one instance where data terminal 210 and power supply terminal 230 are short-circuited at time t before the third time t3 after the second time t2, and one instance where data terminal 210 and reset terminal 240 are short-circuited at time t before the third time t3 after the second time t2. In this instance, board 120 outputs, from data terminal 210 to the printing apparatus 20, a low-level voltage equal to the first expected value at the first time t1, a high-level voltage equal to the second expected value at the second time t2, and a high-level voltage different from the third expected value at the third time t3. In this instance, the determination unit 411 determines that a short circuit has occurred. Case No. 9 refers to a case in which a short circuit is cleared between data terminal 210 and power supply terminal 230, and a short circuit is cleared between data terminal 210 and reset terminal 240, at a time t before the second time t2 after the first time t1. In this case, board 120 outputs, from data terminal 210 to the printing apparatus 20, a high-level voltage different from the first expected value at the first time t1, a high-level voltage equal to the second expected value at the second time t2, and a low-level voltage equal to the third expected value at the third time t3. In this case, the determination unit 411 determines "that a short circuit has occurred." Case No. 10 refers to a case in which a short circuit is cleared between data terminal 210 and power supply terminal 230, and a short circuit is cleared between data terminal 210 and reset terminal 240, at a time t before the third time t3 after the second time t2. In this case, board 120 outputs, from data terminal 210 to the printing apparatus 20, a high-level voltage different from the first expected value at the first time t1, a high-level voltage equal to the second expected value at the second time t2, and a low-level voltage equal to the third expected value at the third time t3. In this case, the determination unit 411 determines "that a short circuit has occurred." A3-4. Other software configuration: In the first embodiment, when device 130 receives the RS request signal and the printing unit 20 receives a second print instruction during printing based on a first print instruction, device 130 can send the first FS response signal and the second SS response signal to data terminal 210 before initiating printing based on the second print instruction after printing based on the first print instruction has finished. When device 130 receives the RS request signal and the printing unit receives a printhead cleaning instruction 5, device 130 can send the first FS response signal and the second SS response signal to data terminal 210 before performing the cleaning.When device 130 receives the RS request signal, and carriage 30 is in a replacement position where replacement of the liquid housing tank 100 is possible, device 130 can send the first response signal FS and the second response signal SS to data terminal 210. Furthermore, when device 130 receives the RS request signal, and carriage 30 moves from the replacement position to a standby position where replacement of the liquid housing tank 100 is not possible, device 130 can send the first response signal FS and the second response signal SS to data terminal 210. The replacement position is, for example, the position of carriage 30 in the home position. The first response signal (FS) can also be called the first signal. The second response signal (SS) can also be called the second signal. The first low response voltage can also be called the first low voltage. The first high response voltage can also be called the first high voltage. The second low response voltage can also be called the second low voltage. The second high response voltage can also be called the second high voltage. The low clock voltage can also be called the low voltage. The high clock voltage can also be called the high voltage. The low reset voltage can also be called the low voltage. The high reset voltage can also be called the high voltage. A4. Other realizations of the first realization: A4-1. Realization 1 for the plate: Figure 21A is a diagram illustrating a board as of embodiment 1. Figure 21A illustrates an example of a combination of arrangements of a plurality of cp contact portions. The arrangement of the cpd data contact portion, cpc clock contact portion, cpvd power supply contact portion, cpr reset contact portion, and cpvs ground contact portion is not limited to the first embodiment, and another arrangement may be used as illustrated in combinations 1 to 24 in Figure 21A. 24 includes arrangements in which the clock contact portion cpc, data contact portion cpd, power supply contact portion cpvd and reset contact portion cpr are arranged in the first region Rg1, and the ground contact portion cpvs is arranged in the second region Rg2.Each row in the table describes an arrangement in which the contact portion listed in column (A) is located in the position corresponding to the projection position (A) on the virtual line C2 shown in the diagram to the left of FIG. 21A (i.e., the position of the cpc contact portion in the first possible arrangement shown). Similarly, the contact portion in column (b) is located in the position corresponding to the projection position (b) shown in the diagram, and so on. In other words, the locations of the contact portions can be changed around to match any of the arrangements given in the table in different embodiments. In combinations No. 1 through No. 18 of the cp contact portion arrangements, at least one cp contact portion between the cpc clock contact portion, the cpvd power supply contact portion, and the cpr reset contact portion is arranged to project between the swd projection position of the cpd data contact portion and the swvs projection position of the cpvs ground contact portion. In combinations No. 1 through No. 12 of the cp contact portion arrangements, any two or more cp contact portions between the cpc clock contact portion, the cpvd power supply contact portion, and the cpr reset contact portion are arranged to project between the swd projection position of the cpd data contact portion and the swvs projection position of the cpvs ground contact portion. In combinations number 1 to number 6 and number 13 to numberIn arrangement 18 of the cp contact portions, the cpd data contact portion is arranged to project between the projection positions of any two cp contact portions between the cpvd power supply contact portion, the cpr reset contact portion, and the cpc clock contact portion. In combinations 1, 3, 8, 11, 14, 15, 20, and 23 of the cp contact portion arrangements, either or both of the cpd data contact portion and the cpr reset contact portion are arranged so as to project onto the second virtual line C2 between the cpvd power supply contact portion and the cpc clock contact portion. The reset contact portion cpr is arranged so that the projection position swr is adjacent to or close to the projection position oscillation swvd of the power supply contact portion cpvd. In combinations no.In arrangements 1, 2, 6 to 8, 13, 14, 16, 23, and 24 of the cp contact portions, the cpvd power supply contact portion is arranged so that the swvd projection position is adjacent to or near the swd projection position of the cpd data contact portion. In combination no. 1 of the cp contact portions arrangements, the cpc clock contact portion is arranged to project at the position furthest from the swvs projection position swings of the cpvs ground contact portion. The data contact portion cpd, the power supply contact portion cpvd, and the reset contact portion cpr are arranged to project in that order in one direction from the projection position swc of the clock contact portion cpc to the projection position swvd of the ground contact portion cpvs on the second virtual line C2. Figure 21B illustrates examples of the arrangements indicated by numbers 2 and 3 in Figure 21A. It will be appreciated that examples 4 through 24 could be illustrated similarly. A 120b plate corresponds to the example of the arrangement indicated by number 2 in Figure 21A. The 120b plate differs from the 120 plate illustrated in Figure 5 in that the positional relationship between the clock contact portion (cpc) and the reset contact portion (cpr) is changed. A 120c plate corresponds to the example of the arrangement indicated by number 3 in Figure 21A. The 120c plate differs from the 120 plate illustrated in Figure 5 in that the positional relationship between the power supply contact portion (cpvd) and the reset contact portion (cpr) is changed. The combination of arrangements of the cp contact portions illustrated in FIG. 21A can be applied similarly to the combination of arrangements of the data terminal 210, clock terminal 220, power supply terminal 230, reset terminal 240, and earth terminal 250. The combination of arrangements of the cp contact portions illustrated in FIG. 21A can also be applied to the combination of arrangements of the device-side terminals 490. In the first embodiment and in Figures 21A and 21B, the cpvs ground contact portion is located in the second region Rg2, but one or more contact portions other than the cpvs ground contact portion may be located in the second region Rg2. For example, the cpd data contact portion, the cpvd power supply contact portion, the cpr reset contact portion, and the cpvs ground contact portion may be located in the first region Rg1, and the cpc clock contact portion may be located in the second region Rg2.For example, the data contact portion (cpd), clock contact portion (cpc), reset contact portion (cpr), and ground contact portion (cpvs) can be arranged in the first region (Rg1), and the power supply contact portion (cpvd) can be arranged in the second region (Rg2). Similarly, in the examples above, the positional relationships between the cp contact portion arranged in the first region (Rg1) and the cp contact portion arranged in the second region (Rg2) are similar to those in the first embodiment. A4-2. Realization 2 for the plate: Figure 22 is a diagram illustrating plates 120d and 120e of two patterns as embodiment 2. The arrangement of the grounding portion 250 is not limited to the first embodiment described above, and other arrangements may be used. The arrangement of the cpvs grounding portion on plate 120d differs from the arrangement on plate 120 illustrated in Figure 5. The cpvs grounding portion of plate 120d is arranged to form part of the second row R2. When plate 120d is used, the coupling mechanism 400 illustrated in Figures 7A and 7B includes a terminal on the apparatus side corresponding to the cpvs grounding portion of plate 120. The number of cpvs grounding portions is not limited to the first embodiment described above and may be two or more. The number of cpvs ground contact portions on plate 120e is different from plate 120 illustrated in FIG. 5.The 120e board includes two earth terminals, 250a and 250b, and each earth terminal includes a cpvs earth contact portion. When the 120e board is used, the 400 coupling mechanism illustrated in Figures 7A and 7B includes two device-side terminals corresponding to the two earth terminals 250a and 250b. The arrangement of the cpd data contact portion, cpc clock contact portion, cpvd power supply contact portion, and cpr reset contact portion of the 120d and 120e boards is the same as the arrangement on the 120 board illustrated in Figure 5, but it could be the same as any of the examples in Figure 21A. The same applies to the other board embodiments discussed below, e.g., 120f, 120g, 120ab, etc.The CPVS ground contact portion of ground terminal 250a and the CPVS ground contact portion of ground terminal 250b are arranged in different positions along the first virtual line C1. The CPVS ground contact portion of one ground terminal 250a is arranged to form part of the second row R2. The CPVS ground contact portion of the other ground terminal 250b is arranged to form part of the first row R1. A4-3. Realization 3 for the plate: Figure 23 is a diagram illustrating plates 120f and 120g of two patterns as in embodiment 3. The size of the ground terminal 250 is not limited to the first embodiment described above and can have other values. A ground terminal 250c on plate 120f and a ground terminal 250d on plate 120g are larger than the ground terminal 250 illustrated in Figure 5. The ground terminal 250c extends across the first row R1 and the second row R2. The ground terminal 250c is arranged to extend into a central CMP portion of plate 120f in the direction along the first virtual line C1. The ground terminal 250d on plate 120g is further formed over the first region Rg1 and the second region Rg2. The ground terminal 250d is arranged to extend into the first virtual line C1. A4-4. Realization 4 for the plate: FIG.24 is a diagram illustrating plates 120ab and 120ac of two patterns as embodiment 4. FIG. Figure 25 is a diagram illustrating boards 120ad and 120ae of two patterns as in embodiment 4. The shapes of terminals 210 to 250 are not limited to the first embodiment described above, and other shapes may be used. As illustrated in FIG. 24, terminals 210 to 250 of board 120ab are shaped to extend across the first row R1 and the second row R2, and have an elongated shape along the first virtual line C1. Terminals 210 to 250 of board 120ac have a portion that is elongated along the first virtual line C1 in addition to a rectangular portion like terminals 210 to 250 of board 120. The data terminal 210 of board 120ad has a portion bent in directions along the first virtual line C1 and the second virtual line C2.The data terminal 210 of board 120ae has portions bent in one direction along the first virtual line C1 and the second virtual line C2 to surround a portion of the power supply terminal 230. The positional relationship between the contact portions cp of terminals 210 to 250 is the same as the positional relationship between the contact portions cp illustrated in FIG.5 in the first embodiment. A4-5. Realization 5 for the plate: Figure 26 is a diagram illustrating a 120Td plate as embodiment 5. The upper portion of Figure 26 illustrates the 120Td plate. The lower portion of Figure 26 schematically illustrates a 400Td coupling mechanism corresponding to the 120Td plate. In the 120Td plate in the first embodiment, the plurality of cp contact portions are arranged to form two rows, but this disclosure is not limited to this. In the 120Td plate, the contact portions are arranged to form three rows. The cpd data contact portion and the cpvs ground contact portion form a third row. As described above, although the cp contact portions are arranged differently from the arrangement of the cp contact portions in the first embodiment in the direction along the first virtual line C1, the projection positions on the second virtual line C2 remain unchanged.When the 120TD board is mounted in one direction along the gravity direction, on the 120TD board, the clock contact portion (cpc), the power supply contact portion (cpvd), and the reset contact portion (cpr) are arranged on the +Z direction side, which is the gravity direction side of the data contact portion (cpd). At least one cpc, cpvd, or cpr contact portion between the clock contact portion (cpc), the power supply contact portion (cpvd), and the reset contact portion (cpr) is arranged to project between the swd projection position of the data contact portion (cpd) and the swvs projection position of the ground contact portion (cpvs) when the cp portions are projected onto the second virtual line C2.Similar to the cpd data contact portion and the cpvs earth contact portion in the present embodiment, the cp contact portions other than the cpd data contact portion and the cpvs earth contact portion may be arranged in positions different from the positions of the cp contact portions in the first embodiment, in the direction along the first virtual line C1. The positional relationship between the cp contact portions described above is similar to the positional relationship between the cp contact portions of the apparatus-side terminals 490.When the 120Td board is mounted in the direction along the gravity direction, the device-side clock contact portion dcpc, the device-side power supply contact portion and the device-side dcpr reset contact portion are arranged on the +Z direction side, the gravity direction side of the device-side data contact portion.At least one dcpc, depvd or dcpr contact portion between the dcpc apparatus side clock contact portion, the dcpvd apparatus side power supply contact portion, and the dcpr apparatus side reset contact portion is arranged to project between the swd projection position of the dcpd apparatus side data contact portion and the swvs projection position of the dcpvs apparatus side ground contact portion when the dcp contact portions are projected over the second virtual line C2. A4-6. Realization 6 for the plate: Figure 27 is a diagram illustrating 120U and 120V plates of two patterns, as in embodiment 6 for the plate. The shape of the 120bd base member of the 120 plate is not limited to the first embodiment described above. The 120U plate is commonly used for the four liquid housing tanks 100A to 100D. In this case, the four liquid housing tanks 100A to 100D can be integrally formed. The 120U plate includes a first plate region 120UA, a second plate region 120UB, a third plate region 120UC, and a fourth plate region 120UD. The first plate region 120UA is the region in which the 290 terminals used in the 100A liquid housing tank are arranged. The second plate region 120UB is a region in which the terminals 290 used in the liquid housing tank 100B are arranged.The third board region, 120UC, is a region where the 290 terminals used in the 100C liquid housing are located. The fourth board region, 120UD, is a region where the 290 terminals used in the 100D liquid housing are located. The first board region, 120UA, through the fourth board region, 120UD, can be considered separate boards. Four devices, 130A to 130D, used in the four 100A to 100D liquid housings, are provided on the back surface 120fb of the 120U board. The 290 terminals in each of the board regions 120UA to 120UD are connected to the corresponding devices 130A to 130D via a wiring pattern layer (not shown) or a through-hole provided in the 120U board. In this case, the VDD power supply voltage is supplied to each of the devices 130A to 130D through a common 230 power supply terminal.In the present embodiment, the common power supply terminal 230 is provided on the 290 pins of the first board region 120UA. Therefore, on the 120U board, the power supply terminal 230 is not provided on the 290 pins in the second board region 120UB through the fourth board region 120UD. As described above, some of the 290 pins can be commonly used by multiple devices 130A through 130D. In the first embodiment, the base member 120bd of the plate 120 is configured as a single member. This disclosure is not limited to this, and the base member 120bd may be configured as a plurality of base members. In the 120V plate, the device 130 and the terminals 290 are arranged on separate base members 124a and 124b instead of a single base member. The 120V plate has a first base member 124a and a second base member 124b. The first base member 124a and the second base member 124b are electrically coupled to each other by a conductive line EL or similar. The materials of the first base member 124a and the second base member 124b are different from each other. The first base member 124a is, for example, a rigid base member, and the second base member 124b is a sheet-like base member. Device 130 is molded by resin 139 on the front surface 120faa of the first base member 124a.Terminals 290 are arranged on the front surface 120fab of the second base member 124b. A4-7. Realization 7 for the plate: Figure 28 is a diagram illustrating a 120X board in embodiment 7. In the first embodiment, as illustrated in Figure 5, the 290 terminal types are five: data terminal 210, clock terminal 220, power supply terminal 230, reset terminal 240, and ground terminal 250. This disclosure is not limited to this, and the number of types may be less than five. For example, the 120X board includes data terminal 210, clock terminal 220, power supply terminal 230, and ground terminal 250. The 120X board does not include reset terminal 240. In this case, the reset signal RST is generated using the clock signal SCK, for example, in processing unit 136 of device 130. For example, power supply terminal 230 may not be provided on the 120X board.In this case, the power supply voltage VDD is generated using the clock signal SCK, for example, in the processing unit 136 of device 130. For example, on board 120X, the power supply terminal 230 may be provided, and the reset terminal 240 may not be provided. As described above, the terminals 290 in the first embodiment described above may not include at least one of the reset terminal 240 and the power supply terminal 230. In the present embodiment, among the terminals 290 of board 120, the terminals 290 other than the ground terminal 250 are referred to as "another group of terminals." In the present embodiment, the ground terminal 250 may also be referred to as the first terminal. The data terminal 210 may also be referred to as the second terminal. The clock terminal 220 may also be referred to as the third terminal.The CPVS ground contact portion can also be called the first contact portion. The CPD data contact portion can also be called the second contact portion. The CPC clock contact portion can also be called the third contact portion. A4-8. Realization 8 for the plate: In the embodiments of this disclosure, the arrangement of terminals 290 or contact portions cp may be changed to either side of the first virtual line C1. The terminals forming the first row and the terminals forming the second row may be changed. A4-9. Embodiment 1 of the liquid housing tank: The liquid housing tank in this disclosure is not limited to the liquid housing tank 100 illustrated in FIG. 3 and may have other configurations. Other embodiments of the liquid housing tank 100 are described below. Components similar to the components of the liquid housing tank 100 in the first embodiment illustrated in FIG. 3 and 4, and similar components among other embodiments of the liquid housing tank, are indicated by the same reference symbols, and their description is omitted accordingly. The printing apparatus component 20, such as the housing section 4 illustrated in FIG. 4, is changed according to the configuration of the liquid housing tank. Figure 29 is a perspective view illustrating a liquid housing reservoir 100p as embodiment 1 of the liquid housing reservoir. The liquid housing reservoir 100p includes the liquid housing body 101, the liquid supply portion 104 having the liquid supply orifice 104p, and the plate 120. The liquid housing body 101 forms the ink chamber 150 that houses the ink inside. The liquid supply portion 104 is formed in the lower wall 101wb and communicates with the ink chamber 150. The plate 120 is provided in a corner portion 89 where the third wall 101wb and the second wall 101wr of the liquid housing body 101 intersect.The fluid housing reservoir 100p is mounted in the housing section 4 such that a second protruding reservoir engagement portion 320 of the first wall 101wf engages with a recessed portion of the housing section 4, and the fluid housing reservoir 100p is then rotated and moved in a rotational mounting direction RD using the second reservoir engagement portion 320 as a fulcrum. In the completed assembly state, a first protruding reservoir engagement portion 310 of the second wall 101wr engages with a lever in the housing section 4. In the present embodiment, the mounting direction MD includes a +Z direction component and a -Y direction component, and the first direction FD includes both positive and negative Y direction components and both positive and negative Z direction components. A4-10. Realization 2 of the liquid housing tank: Figure 30 is a perspective view illustrating a liquid housing reservoir 100q as embodiment 2 of the liquid housing reservoir. Figure 31 is an enlarged view illustrating the periphery of plate 120 of the liquid housing reservoir 100q. As illustrated in Figure 30, the liquid housing reservoir 100q includes the liquid housing body 101, the liquid supply portion 104 having the liquid supply orifice 104p, and plate 120. A liquid housing bag (not illustrated) that houses the ink is disposed in the liquid housing body 101. The liquid housing bag is flexible and functions as the ink chamber 150. The liquid supply portion 104 is provided in the liquid housing bag and is disposed in an opening portion 424 formed in the front wall 101wf of the liquid housing body 101.The plate 120 is provided at the corner portion 89a where the second wall 101wr and the fourth wall 101wu of the fluid housing body 101 intersect. The corner portion 89a is a recessed portion of the fluid housing body 101, which is recessed inward. In the present embodiment, the mounting direction MD is the -Y direction, and the first direction FD includes both positive and negative Y-direction components, and both positive and negative Z-direction components. A4-11. Implementation 3 of the liquid housing tank: Figure 32 is a perspective view illustrating a liquid housing reservoir 100r as embodiment 3 of the liquid housing reservoir. In the liquid housing reservoir 100r, the -Y direction is the MD mounting direction. The liquid housing reservoir 100r includes the liquid housing body 101, the liquid supply portion 104 having the liquid supply orifice 104p, and the plate 120. A liquid housing bag (not illustrated) that houses the ink is disposed in the liquid housing body 101. The liquid housing bag is flexible and functions as the ink chamber 150. The liquid supply portion 104 is provided in the liquid housing bag and is disposed in the opening portion 424 formed in the second wall 101wr of the liquid housing body 101.Plate 120 is provided at the corner portion 89a where the second wall 101wr and the fourth wall 101wu of the liquid housing body 101 intersect. Corner portion 89a is a recessed portion of the liquid housing body 101, recessed inwards. A slot-type coupling structure 425 is formed on the third wall 101wb of the liquid housing body 101. The coupling structure 425 regulates movement in the +Y direction, which is the extraction direction of the liquid housing tank 100, engaging with a coupling structure on the protruding apparatus side of the housing section 4 in the fully assembled state of the liquid housing tank 100r.In the present embodiment, the MD assembly direction is the -Y direction, and the first FD direction includes both positive and negative Y direction components, and both positive and negative Z direction components. A4-12. Implementation 4 of the liquid housing tank: Figure 33 is a perspective view illustrating a liquid housing reservoir 100s as embodiment 4 of the liquid housing reservoir. The liquid housing reservoir 100s is detachably housed in a retractable housing 61 provided in the printing apparatus 20 and is then mounted in the printing apparatus 20 together with the housing 61. The liquid housing reservoir 100s includes the liquid housing bag 111 and a coupling member 112 attached to an end portion of the liquid housing bag 111 on the -Y direction side. In the present embodiment, the liquid housing bag 111 and the coupling member 112 function as a liquid housing body. The liquid housing bag 111 is flexible.The fluid supply portion 104, which has the fluid supply orifice 104p, is provided on the -Y direction side of the fluid housing bag 111, which functions as the ink chamber 150. The fluid supply portion 104 is arranged in the opening portion 424 formed in the second wall 101wr of the coupling member 112. The plate 120 is arranged in the corner portion 89a, which is a recessed portion formed in the second wall 101wr of the coupling member 112. In the present embodiment, the MD mounting direction is the -Y direction, and the first FD direction includes both positive and negative Y direction components, and both positive and negative Z direction components. A4-13. Implementation 5 of the liquid housing tank: Figure 34 is a perspective view illustrating a 100w liquid housing tank as embodiment 5 of the liquid housing tank. In the 100w liquid housing tank, plate 120 is arranged on the fourth wall 101wu, which is a horizontal surface, in the completed assembly state. The fourth wall 101wu forms the top wall in the completed assembly state. The 100w liquid housing tank includes the liquid housing body 101 and the liquid supply portion 104, which has the liquid supply orifice 104p, similarly to the 100 liquid housing tank illustrated in Figures 3 and 4. A flexible liquid housing bag (not illustrated) that holds the ink is arranged in the liquid housing body 101. The liquid housing bag functions as the ink chamber 150.The fluid supply portion 104 is provided in the fluid housing bag and is arranged in the opening portion 424 formed in the second wall 101wr of the fluid housing body 101. In the present embodiment, the assembly direction MD is the -Y direction, and the first direction FD is both the positive and negative Y direction. A4-14. Implementation 6 of the liquid housing tank: Figure 35 is a perspective view illustrating a liquid housing tank 100x as embodiment 6 of the liquid housing tank. In the liquid housing tank 100x, plate 120 is arranged on the fifth wall 101wsa, being a vertical surface, in the completed assembly state. The fifth wall 101wsa forms a side wall in the completed assembly state. The liquid housing tank 100x includes the liquid housing body 101 and the liquid supply portion 104 having the liquid supply orifice 104p, similarly to the liquid housing tank 100 illustrated in Figures 3 and 4. A flexible liquid housing bag (not illustrated) that holds the ink is arranged in the liquid housing body 101. The liquid housing bag functions as the ink chamber 150.The fluid supply portion 104 is provided in the fluid housing bag and is arranged in the opening portion 424 formed in the second wall 101wr of the fluid housing body 101. In the present embodiment, the mounting direction MD is the -Y direction, and the first direction FD is both the positive and negative Y direction. A4-15. Implementation 7 of the liquid housing tank: Figure 36 is a diagram illustrating a liquid housing reservoir 100y as embodiment 7 of the liquid housing reservoir. As illustrated in Figures 3 and 4, in the liquid housing reservoir 100 in the first embodiment, the liquid housing body 101 and the plate 120 are integrally configured. This disclosure is not limited to this. For example, the liquid housing reservoir 100y includes a liquid housing body 101ya that forms the ink chamber 150 and an adapter 101yb to which the plate 120 is attached. The liquid supply portion 104 is formed in the liquid housing body 101ya. The liquid housing body 101ya is housed in the recessed adapter 101yb to be removable. The adapter 101yb functions as a housing for the liquid housing body 101ya.An opening portion 134 into which the liquid supply portion 104 is inserted is formed in the third wall 101wb of the adapter 101yb. The liquid housing body 101ya can be attached to the adapter 101yb using a fastening member (not shown). The liquid housing body 101ya may not be attached to the adapter 101yb. A4-16. Implementation 8 of the liquid housing tank: Figure 37 is a diagram illustrating the liquid housing tanks 100g and 100h as embodiment 8 of the liquid housing tank. As illustrated in Figures 4 to 6, in the liquid housing tank 100 in the first embodiment, the plurality of terminals 290 and the device 130 are arranged on the base member 120bd. This disclosure is not limited to this. In the liquid housing tank 100g, the plurality of terminals 290 and the device 130 are arranged directly on the second wall 101wr of the liquid housing body 101 without the base member 120bd intervening. The plurality of terminals 290 and the device 130 are electrically coupled to each other by a wiring pattern (not illustrated) or similar. As described above, the liquid housing body 101, the plurality of terminals 290, and the device 130 can be integrally configured as the liquid housing reservoir 100g. In the liquid housing tank 100h, the plurality of terminals 290 are arranged directly on the second wall 101wr of the liquid housing body 101 without the base member 120bd intervening. The device 130 is arranged on a mounting base member 120h and is mounted on the second wall 101wr of the liquid housing body 101 via the mounting base member 120h. The plurality of terminals 290 and the device 130 are electrically coupled to each other by a wiring pattern (not illustrated) or the like. As described above, the liquid housing body 101 and the plurality of terminals 290 can be configured as a single unit, just like the liquid housing tank 100h, and the device 130 can be configured separately. A4-17. Embodiment 9 of the liquid housing tank: Figure 38 is a perspective view illustrating a liquid housing reservoir 100z as embodiment 9 of the liquid housing reservoir. Figure 39 is an enlarged view illustrating the periphery of plate 120 of the liquid housing reservoir 100z. The XYZ axes illustrated in Figures 38 and 39 in embodiment 9 are based on the state in which the liquid housing reservoir 100z is fully inserted into the housing section described later in the printing apparatus. When the liquid housing reservoir 100z is mounted in the printing apparatus, two mounting operations are performed. In the present embodiment, the first direction FD has a Y direction component and a Z direction component, and the second direction SD is the X direction. As illustrated in Figure 38, the liquid housing reservoir 100z is mounted in the printing apparatus.38, the liquid housing tank 100z includes a liquid housing body 101z, the liquid supply portion 104 having the liquid supply orifice 104p, and the plate 120. The liquid housing body 101z includes a main housing body 101za capable of housing a liquid and a cover member 101zb nested to the main housing body 101za. The liquid supply portion 104 is arranged in the opening portion 424 formed in the third wall 101wb of the liquid housing body 101z formed by the cover member 101zb. The plate 120 is provided in a corner portion 89z in which the second wall 101wr and the third wall 101wb of the liquid housing body 101z intersect each other. The corner portion 89z is a recessed portion of the fluid housing body 101z, which is recessed inwards. As illustrated in FIG. 39, the orientation of plate 120 is different from the orientation in FIG. 5, and the data terminal 210 and the reset terminal 240 are located on the -Z address side of the clock terminal 220, the power supply terminal 230, and the ground terminal 250. Figure 40 is a first diagram illustrating a mounting procedure for the 100z fluid reservoir in a 4z housing section of the printing apparatus. Figure 41 is a second diagram illustrating the mounting procedure for the 100z fluid reservoir in the 4z housing section of the printing apparatus. Figure 42 is a diagram illustrating the completed mounting state of the 100z fluid reservoir. The 4z housing section is located in a different place from the printhead (not shown). The 4z housing section and the printhead are connected by a fluid flow tube (not shown). The fluid in the 100z fluid reservoir mounted in the 4z housing section is supplied to the printhead through the fluid flow tube. As illustrated in FIG. 40, with respect to the liquid housing tank 100z, by moving the liquid housing tank 100z in a first mounting direction MD1, which is a horizontal direction, the liquid housing tank 100z is inserted into a mounting chamber 65 in the housing section 4z through a fixing / clearance opening portion 474 of the housing section 4z. The first mounting direction MD1 is the -Y direction. As illustrated in FIG. 41, the liquid housing tank 100z is pushed in the first mounting direction MD1, and contact is completed between the apparatus-side terminal 490 of the coupling mechanism 400 in the housing section 4z and the terminal 290 of plate 120. By pushing down the second wall 101wr on the side of the liquid housing tank 100z illustrated in FIG. 41, the liquid housing tank 100z rotates and moves in a second mounting direction MD2, which has a gravity direction component, around a rotational pivot point Rp provided in the housing section 4z. The second mounting direction MD2 has a +Z direction component and a +Y direction component. As illustrated in FIG. 42, when the rotational movement of the liquid housing tank 100z is completed in the second mounting direction MD2, the liquid supply portion 104 of the liquid housing tank 100z is coupled to the liquid introduction portion 6 of the housing section 4z. In the present embodiment, either of the first mounting direction MD1 and the second mounting direction MD2 is the MD mounting direction. A4-18. Implementation 10 of the liquid housing tank: In the first embodiment and other embodiments, the liquid housing reservoir 100 is an ink cartridge, but this disclosure is not limited to this. The liquid housing reservoir 100 may be, for example, a waste liquid housing reservoir. The waste liquid housing reservoir is, for example, a reservoir that holds waste liquid discharged from the printhead nozzle 5 when the printing apparatus 20 performs printhead cleaning 5. A4-19. Realization 1 of the printing system: The printing system in this disclosure is not limited to the 1000 printing system illustrated in FIG. 1. FIG. 43 is a diagram illustrating a 1000A printing system as embodiment 1 of the printing system. In the first embodiment, as illustrated in FIG. 1, an on-carriage configuration is used, in which the fluid housing reservoir 100 is mounted on the carriage 30, but this disclosure is not limited to this. An off-carriage configuration may be used, in which the fluid housing reservoir 100 is mounted in a location other than the carriage 30. The 1000A printing system is an off-carriage type printing system and includes a printing apparatus 20A and a fluid housing reservoir 100T. The printing apparatus 20A includes the carriage 30, which includes the print head 5.The 100T liquid housing tank is detachably mounted on a 600 tank mounting portion located in a different place on the carriage 30. Similar to the 100 liquid housing tank in the first embodiment, the 100T liquid housing tank also includes a liquid housing body, a liquid housing section having an ink supply orifice, and a plate. For example, the 100q to 100x liquid housing tanks illustrated in Figures 30 to 35 are mounted on the printing apparatus 20A. The printing apparatus 20A performs the coupling status determination processing in a manner similar to the printing apparatus 20. A4-20. Realization 2 of the printing system: Figure 44 is a diagram illustrating a 1000C printing system as embodiment 2 of the printing system. In the first embodiment, as illustrated in Figure 1, the housing section 4 in which the liquid housing reservoir 100 is detachably mounted is arranged in the main body of the printing apparatus 20, but the position of the housing section 4 is not limited to this. In the 1000C printing system illustrated in Figure 44, a housing section 4C of the printing apparatus 20C is arranged outside a main body 201 of the printing apparatus 20C. As illustrated in FIG. 7A and 7C, the housing section 4C includes the liquid introduction portion 6, the coupling mechanism 400, and the subcontrol plate 500. The liquid introduction portion 6 and the print head 5 arranged in the main body 201 communicate with each other via a flexible liquid flow tube 105.A plurality of liquid flow tubes 105 corresponding to the number of liquid introduction portions 6 is provided. The plurality of liquid flow tubes 105 is housed in a protective tube 106. The printing apparatus 20C includes a bus 107 that couples the subcontrol plate 500 to the main control unit 40 (not illustrated) located in the main body 201 for transmitting and receiving various signals. Similar to the liquid housing reservoir 100 in the first embodiment described above, the liquid housing reservoir 100 illustrated in FIG. 44 also includes a liquid housing body, a liquid supply portion including a liquid supply orifice, and a plate. The printing apparatus 20C performs the coupling state determination processing in a manner similar to the printing apparatus 20. A4-21. Realization 3 of the printing system: Figure 45 is a diagram illustrating a 1000D printing system as embodiment 3 of the printing system. The 1000D printing system includes the four liquid housing reservoirs 100A, 100B, 100C, and 100D and the printing apparatus 20 illustrated in Figure 1, as in the first embodiment. The liquid housing reservoirs 100A to 100D can be integrally formed or individually formed. The liquid housing reservoirs 100A to 100D are replenished with liquid via an external liquid storage portion 814 and an external liquid flow tube 812, which are arranged outside the 1000D printing system. In Figure 45, the liquid housing portion 814 and the external liquid flow tube 812 are located outside the printing system. 45, in the liquid storage portion 814 and the liquid flow tube 812, the elements corresponding to the respective liquid housing tanks 100A to 100D are given the letter "A" to "D". A4-22. Realization 4 of the printing system: Figure 46 is a diagram illustrating a 1000E printing system as embodiment 4 of the printing system. The 1000E printing system includes an adapter 101E comprising the plate 120, a liquid housing body 824 capable of holding a liquid, a liquid flow tube 822, and the printing apparatus 20 illustrated in Figure 1. The adapter 101E can be detachably mounted on the housing section 4. The liquid flow tube 822 connects the liquid housing body 824 and the liquid inlet portion 6, and functions as a liquid supply portion. A portion of the liquid flow tube 822, which is connected to the liquid inlet portion 6, functions as a liquid supply orifice. Four 101E adapters, four 822 liquid flow tubes, and four 824 liquid housing bodies are provided.In the 1000E printing system, the "assembly complete state" means a state in which the adapter 101E, which includes the board 120, is mounted on the printing unit 20 and no short circuit occurs between the terminals 290. In the present embodiment, the statement that "the board 120 is mounted on the printing unit 20" means that the board 120 is physically attached to the printing unit 20 and the cp contact portions of the terminals 290 are electrically coupled to the side terminals of the unit 490. The data terminal 210 of the board 120 is used to detect whether or not the board 120 is mounted on the printing unit 20. The mounting determination unit 412 of the printing unit 20 determines whether or not the board 120 is mounted. The first response signal RT1 and the second response signal RT2 are signals used when the printing apparatus 20 determines that the plate 120 is mounted on the printing apparatus 20. A4-23. Other realizations for electrical configuration and software configuration: In the first embodiment, as illustrated in FIG. 1, the four liquid housing tanks 100A to 100D are detachably mounted in the housing section 4, but the number of liquid housing tanks 100 detachably mounted in the housing section 4 is not limited to this. A timing diagram for the coupling state determination process in the printing system 1000, in which six liquid housing tanks 100 are detachably mounted in the housing section 4, will be described below with reference to FIG. 47A and 47B. The six liquid housing tanks 100 hold, for example, inks of different colors. FIG. 47A and 47B are timing diagrams that schematically illustrate signals introduced / emitted to / from the terminals 290 of the liquid housing tank 100 in the fully assembled state.Figure 47A is a first timing diagram in the 1000 printing system, which includes six liquid housing tanks 100A to 100F. Figure 47B is a second timing diagram in the 1000 printing system, which includes the six liquid housing tanks 100A to 100F. Figure 47A corresponds to Figure 11A, and Figure 47B corresponds to Figure 11B. VDD, RST, SCK, and SDA1 to SDA6, illustrated in Figures 47A and 47B, signify signals transmitted and received through the corresponding terminal 290 or voltages supplied by the corresponding lines LVDD, LRST, LSCK, and LSDA1 to LSDA6. The RS request signal illustrated in FIG. 47A is different from the RS request signal illustrated in FIG. 11A in those bits of cycles D4 and D3 in the CMT command period illustrated in FIG. 47A are assigned to designate the fifth liquid housing tank 100E and the sixth liquid housing tank 100F. With respect to the RS request signal transmitted through data line LSDA5 coupled to device 130E of liquid housing tank 100E, the second bit of the first identification data DB1 is high, and the remaining bits are low. With respect to the RS request signal transmitted through data line LSDA6 coupled to device 130F of liquid housing tank 100F, the first bit of the first identification data DB1 is high, and the remaining bits are low. The timing diagram illustrated in FIG. 47B differs from the timing diagram illustrated in FIG. 11B in that it includes waveforms of the first response signal (FS) and the second response signal (SS) corresponding to liquid housing tanks 100E and 100F. Device 130E of liquid housing tank 100E sends the first response signal (FS) to data terminal 210 during cycle D4 of the first response period RT1, and sends the second response signal (SS) to data terminal 210 during cycle D4 of the second response period RT2. Device 130F of liquid housing tank 100F sends the first response signal (FS) to data terminal 210 during cycle D3 of the first response period RT1, and sends the second response signal (SS) to data terminal 210 during cycle D3 of the second response period RT2. Figure 48 is a schematic diagram illustrating the electrical configuration of a 1000 printing system, including the six fluid housing tanks 100A to 100F. In Figure 48, components similar to those in the electrical configuration illustrated in Figure 8 are designated by the same reference symbols, and their descriptions are omitted accordingly. The electrical configuration in Figure 48 differs from that of Figure 8 in that the LSDA, LRST, LSCK, and LVDD lines, other than the LVSS ground line, are provided independently for the four fluid housing tanks 100A to 100D in Figure 8, whereas the LRST, LSCK, and LVDD lines, other than the LSDA data line, are commonly used by a plurality of devices 130 in Figure 48. Also in FIG.48, the LVSS ground line is commonly used by the 130A to 130F devices of the six 100A to 100F liquid housing tanks. As illustrated in FIG. 48, a power supply line LVDD2 electrically coupled to a host terminal HVDD2 of subcontrol unit 50 is electrically coupled to devices 130B and 130E in the completed assembly state. A reset line LRST2 electrically coupled to a host terminal HRST2 of subcontrol unit 50 is electrically coupled to devices 130B and 130C in the completed assembly state. A clock line LSCK2 electrically coupled to a host terminal HSCK2 of subcontrol unit 50 is electrically coupled to devices 130B and 130D in the completed assembly state. A power supply line LVDD4 electrically coupled to a host terminal HVDD4 of subcontrol unit 50 is electrically coupled to devices 130B and 130D in the completed assembly state.A reset line LRST4 electrically coupled to a host terminal HRST4 of subcontrol unit 50 is electrically coupled to devices 130D and 130E in the completed assembly state. A clock line LSCK4 electrically coupled to a host terminal HSCK4 of subcontrol unit 50 is electrically coupled to devices 130C and 130E in the completed assembly state. Lines LSDA1, LVDD1, LRST1, and LSCK1 electrically coupled to device 130A, and lines LSDA6, LVDD6, LRST6, and LSCK6 electrically coupled to device 130F, are used independently and are not used in combination with other 130 devices. Regarding the electrical configuration of the 1000 printing system illustrated in FIG. 48, parts of this configuration, such as the shared lines, can be applied to the 1000 printing system illustrated in FIG. 1, which includes the four fluid housing tanks 100A to 100D. For example, the fluid housing tanks 100B to 100E illustrated in FIG. 48 can be replaced by the fluid housing tanks 100A to 100D of the 1000 printing system illustrated in FIG. 1. A4-24. Implementation 1 for the device: In the first embodiment, as illustrated in FIG. 6, the device 130 includes the processing unit 136 and the storage unit 138, but this disclosure is not limited to this. FIG. 49 is a diagram illustrating devices 130a and 130b as embodiment 1 for device 130. Device 130a includes the processing unit 136 but does not include the storage unit 138. The storage unit 138 and device 130 can be provided separately. In this case, the storage unit 138 is electrically coupled to the processing unit 136 of device 130b. Device 130b includes a first processing unit 136a, a second processing unit 136b, and storage unit 138. The first processing unit 136a is coupled to storage unit 138. The second processing unit 136b is coupled to the first processing unit 136a and terminals 210 to 250.In this way, the first processing unit 136a and the second processing unit 136b function as the processing unit as a whole. As described above, the device 130b may include a plurality of processing units 136a and 136b. A4-25. Implementation 2 for the device: In the first embodiment, as illustrated in FIG. 11C, the first FS response signal is emitted throughout the entire period that the SCK clock signal is high, but this disclosure is not limited to this. For example, device 130 may emit the first FS response signal to data terminal 210 during a portion of the period that the SCK clock signal is high. For example, device 130 may emit the first FS response signal and then set the drive state of data terminal 210 to high impedance during the period that the SCK clock signal is high. For example, device 130 may emit the first FS response signal containing a low level during the period that the SCK clock signal is low and during the period that the SCK clock signal is high in one cycle of the SCK clock signal. A4-26. Embodiment 3 for the device: In the first embodiment, the SCK clock signal frequency is constant during the coupling state determination processing, as illustrated in Figures 11A and 11B, but it need not be constant. For example, the SCK clock signal frequency in the second response period RT2 can be set to be lower than the SCK clock signal frequency in the first response period RT1. The second response signal SS includes different voltages. In the second response period RT2, the SCK clock signal frequency can be set to be lower than the frequency in the first response period RT1, and the second response signal SS can be emitted over a longer period than the first response signal SS. A4-27. Implementation 4 for the device: In the first embodiment, the processing unit 136 of device 130 can repeatedly emit the first response signal FS and the second response signal SS in such a way that the first response period RT1 FS and the second response period RT2 are repeatedly provided in this order during a period in which the reset signal RST is at a high level. When the processing unit 136 emits a low-level voltage on the second response signal SS to data terminal 210, and then the RS request signal is fed back into data terminal 210, the processing unit 136 of device 130 can emit the first response signal FS and the second response signal SS to data terminal 210. A4-28. Implementation 5 for the device: In the first embodiment, as illustrated in FIG. 11B, the rising and falling edge times of the SCK clock signal are the same as the rising and falling edge times of the signal such as the first response signal FS in the first response period RT1 and the signal such as the second response signal SS in the second response period RT2. This disclosure is not limited to this. For example, the rising and falling edge times of the signal such as the first response signal FS in the first response period RT1 and the signal such as the second response signal SS in the second response period RT2 may be delayed from the rising and falling edge times of the SCK clock signal. A4-29. Implementation 6 for the device: In the first embodiment, processing units 136A to 136D of devices 130A to 130D send the first response signal FS and the second response signal SS to data terminal 210 on different cycles of the SCK clock signal. This disclosure is not limited to this. For example, processing units 136A to 136D of devices 130A to 130D may send the first response signal FS and the second response signal SS on the same cycle of the SCK clock signal. In the coupling status determination processing, the printing apparatus 20 transmits and receives signals via the individual data lines LSDA1 to LSDA4 electrically coupled to devices 130A to 130D, respectively.Therefore, although the first response signal FS and the second response signal SS are sent to data terminal 210 from devices 130A to 130D in the same cycle during the first response period RT1 and the second response period RT2, the subcontrol unit 50 of the printing apparatus 20 is able to detect the voltage sent from data terminal 210 during each of the first timing period t1 through the third timing period t3. In this case, the RS request signal is set to a high level in the corresponding bit during the CMT command period. For example, processing units 136A to 136D of devices 130A to 130D can send the first response signal FS and the second response signal SS to data terminal 210 in any or all of cycles D3 to D8 of the first response period RT1 and the second response period RT2. In this case, the first timing t1 can be provided in any or all of cycles D3 to D8 of the first response period RT1. The second timing t2 and the third timing t3 can be provided in any or all of cycles D3 to D8 of the second response period RT2. A4-30. Implementation 7 for the device: In the first embodiment, processing units 136A to 136D of devices 130A to 130D send the first response signal FS and the second response signal SS to data terminal 210 during cycles D8 to D5 of the first response period. This disclosure is not limited to this. For example, processing units 136A to 136D of devices 130A to 130D may send the first response signal FS and the second response signal SS to data terminal 210 during cycles D5 to D8 of the first response period. In this case, the RS request signal is set to a high level in the corresponding bit during the CMT command period. A4-31. Implementation 8 for the device: In the first embodiment, device 130 is configured so that the RS request signal is input to data terminal 210, and the first FS response signal and the second SS response signal are output to data terminal 210. The terminal into which the RS request signal is input may be a terminal other than data terminal 210. Similarly, the terminal that outputs the first FS response signal and the second SS response signal may be a terminal other than data terminal 210. In this case, device 130 is coupled to such a terminal. B. Other achievements: This disclosure is not limited to the foregoing embodiments and may be implemented in various configurations without departing from the scope of the invention as defined by the claims. For example, the technical features in the embodiments corresponding to the technical features in each form described below may be appropriately replaced and combined to solve some or all of the foregoing problems or to achieve some or all of the foregoing objectives. Furthermore, technical features may be appropriately omitted, provided that the technical features are not described as essential in this disclosure. Each form below need not have all the configurations in this disclosure. Each form below may have a minimal configuration to solve the foregoing problems or achieve the foregoing objectives.Unless otherwise stated, the effect corresponding to one form is independent of the effect corresponding to the other form. In the combined form, the effect corresponding to the combined form is exhibited. 1. Pursuant to a first aspect of this disclosure, a device is provided that is configured to be electrically coupled to a plurality of terminals of a liquid housing reservoir mounted in a housing section of a printing apparatus that includes a printhead, a liquid introduction portion that introduces liquid to the printhead, the housing section provided with the liquid introduction portion, and a plurality of apparatus-side terminals provided on the housing section. The device is configured to comply with I, II, III, and IV as follows. 1. I: The device emits a first signal containing a first low voltage and a second signal containing a second low voltage and a second high voltage higher than the second low voltage to a first terminal provided in the plurality of terminals. 2. II: The first and second signals are used when the printing apparatus determines that the first terminal is not short-circuited with any other terminals among the plurality of terminals and that the liquid housing reservoir is being mounted on the printing apparatus. 3. III: The device emits the first signal to the first terminal and, once the device emits the first signal, the device emits the second signal to the first terminal. 4. IV: A clock signal, consisting of alternating low and high voltages with a predetermined period, is input to a second terminal. The device outputs the first low voltage to the first terminal during a first timing interval, while the input voltage at the second terminal is high. After the device outputs the first low voltage, it outputs the second high voltage to the first terminal during a second timing interval, while the input voltage at the second terminal is low. After the device outputs the second high voltage, it outputs the second low voltage to the first terminal during a third timing interval, while the input voltage at the second terminal is high.According to this procedure, the device outputs the first low voltage to the first terminal at the first predetermined time interval, during the period when the voltage input to the second terminal is high. After the device outputs the first low voltage, it outputs the second high voltage to the first terminal at the second time interval, during the period when the voltage input to the second terminal is low. After the device outputs the second high voltage, it outputs the second low voltage to the first terminal at the third time interval, during the period when the voltage input to the second terminal is high. Therefore, it is possible that the device outputs the signal used to determine that the first terminal of the liquid housing tank is not short-circuited with other terminals and that the liquid housing tank is mounted on the printing apparatus.Regardless of whether the fluid reservoir is mounted on the printing unit, it is possible to reduce the likelihood of the printing unit malfunctioning and the possibility of being unable to read from and write to the fluid reservoir. In this respect, the device offers improvements beyond the related technical aspects. 2. In the previous aspect, when the first terminal is not short-circuited with the other terminals, in one clock cycle, the device can output the first low voltage to the first terminal before the first timing interval during the high-voltage period. Generally, the voltage after a predetermined period has elapsed since the start of the output is more stable than the voltage immediately after the start of the output. Therefore, since the device outputs the first low voltage to the first terminal before the first timing interval during the high-voltage period in one clock cycle, it is possible for the device to output the signal to the printer at the first timing interval in a state where the first low-voltage output to the first terminal is stable. 3. In the previous aspect, when the first terminal is not short-circuited with the other terminals, in one clock signal cycle, the device can output the second high voltage to the first terminal before the second timing interval during the low voltage period. Therefore, since the device outputs the first high voltage to the first terminal before the second timing interval during the low voltage period in one clock signal cycle, it is possible for the device to output the signal to the printer during the second timing interval in a state where the first high-voltage output to the first terminal is stable. 4. In the previous aspect, when the first terminal is not short-circuited with the other terminals, in one clock signal cycle, the device can output the second low voltage to the first terminal before the third timing interval during the high-voltage period. Therefore, since the device outputs the second low voltage to the first terminal before the third timing interval during the high-voltage period in one clock signal cycle, it is possible for the device to output the signal to the printer during the third timing interval in a state where the second low-voltage output to the first terminal is stable. 5. In the previous aspect, when the first terminal is not short-circuited with the other terminals, in one clock signal cycle, the device can output a second high voltage to the first terminal when the voltage input to the second terminal changes from high to low, and vice versa. Therefore, the voltage output to the first terminal is different from the voltage input to the second terminal. When the first and second terminals are short-circuited, the voltage at the first terminal is equal to the voltage at the second terminal. Thus, a case where the first and second terminals are not short-circuited and a case where they are short-circuited are distinct.Therefore, it is possible that the device will emit the signal indicating that the first terminal is not shorted to the other terminals and that the liquid housing reservoir is being mounted on the printing apparatus. 6. In the previous section, when the first terminal is not short-circuited with the other terminals, and when the voltage input to the second terminal changes from low to high voltage, the device can output the first low voltage to the first terminal. Therefore, the voltage output to the first terminal is different from the voltage input to the second terminal. When the first and second terminals are short-circuited, the voltage at the first terminal is equal to the voltage at the second terminal. Thus, a case where the first and second terminals are not short-circuited and a case where they are short-circuited are distinct. Therefore, the device may output a signal indicating that the first terminal is not short-circuited with the other terminals and that the liquid housing is being installed in the printing apparatus. 7. In the above, steps III and IV may be performed multiple times. The first signal may not be correctly received from the printing device due to static electricity or similar influences. Accordingly, even with static electricity or similar influences, performing steps III and IV multiple times may result in the device emitting a signal indicating that the first terminal is not short-circuited with the other terminals and that the liquid housing is being assembled. 8. In the preceding aspect, when the printing apparatus receives a second print instruction during printing based on a first print instruction, the device may emit the first and second signals to the first terminal before initiating printing based on the second print instruction, after printing based on the first print instruction has finished. Accordingly, the device may emit the first and second signals to the first terminal before initiating printing based on the second print instruction, after printing based on the first print instruction has finished. Therefore, even during consecutive printing, the device may emit the signal indicating that the first terminal is not short-circuited with the other terminals and that the liquid housing reservoir is being mounted on the printing apparatus. 9. In the previous section, when the printing device receives a printhead cleaning instruction, it can send the first and second signals to the first terminal before performing the cleaning. According to this section, when the printing device receives a printhead cleaning instruction, it sends a signal indicating that the first terminal is not short-circuited with the other terminals and that the fluid reservoir is being installed in the printing device. Therefore, it is possible to eliminate the cleaning failure caused by poor communication. 10. In the previous aspect, the device can emit the first and second signals to the first terminal when the housing section is in a replacement position where the liquid housing reservoir can be replaced. When the housing section moves from the replacement position to a standby position where replacement of the liquid housing reservoir is not possible, the device can emit the first and second signals to the first terminal. Accordingly, the mounting position of the liquid housing reservoir may be unstable immediately after replacement. The mounting position of the liquid housing reservoir may change while it is moving to the standby position.Changing the mounting position can cause a short circuit between the first terminal and the other terminals, or poor contact between the fluid housing and the printing unit. Therefore, by sending the first and second signals to the first terminal, even in the replacement position, and then immediately afterward sending the first and second signals to the first terminal, even in the standby position, the device may send a signal indicating that the first terminal is not short-circuited with the other terminals and that the fluid housing is being mounted in the printing unit. Alternatively, the fluid housing replacement may not yet be complete in the replacement position, but the housing section may be moved to the standby position by a user operation.In such a case, by emitting the first and second signals to the first terminal when the housing section moves to the standby position, it is possible that the device emits the signal indicating that the first terminal is not shorted to the other terminals and that the liquid housing reservoir is being mounted on the printing apparatus. 11. In the above aspect, the first terminal can be a data terminal, the second terminal can be a clock terminal, the first signal can be a first response signal as a response to the printing apparatus, and the second signal can be a second response signal as a response to the printing apparatus. 12. 12. In the above aspect, the device can store information about a liquid housed in the liquid housing tank. 13. In the above aspect, a reset signal containing a low voltage and a high voltage can be entered into a third terminal provided at the other terminals, and a power supply voltage can be entered into a fourth terminal provided at the other terminals. 14. In the above aspect, after the power supply voltage is applied to the fourth terminal, the high voltage can be applied to the third terminal by the reset signal, changing from low to high voltage. After the high voltage of the reset signal is applied to the third terminal, the clock signal can be applied to the second terminal. After the high voltage of the reset signal is applied to the third terminal, the first signal can be applied to the first terminal. 15. 15. In the above aspect, the power supply voltage supplied to the fourth terminal can be used to operate the device. 16. In the above aspect, the third terminal can be a reset terminal, and the fourth terminal can be a power supply terminal. 17. Pursuant to a second aspect of this disclosure, a plate is provided that is mounted on a printing apparatus and configured to contact a plurality of terminals on the apparatus side. The printing apparatus includes a printhead, a liquid introduction portion that introduces liquid to the printhead, a housing section that houses a liquid housing reservoir provided with the liquid introduction portion, and the plurality of terminals on the apparatus side provided on the housing section. The plate includes a base member, a device provided on the base member, and a plurality of terminals provided on the base member and electrically coupled to the device. The plurality of terminals includes a first terminal and other terminals including a second terminal, and the plate is configured to comply with I, II, III, and IV as follows. 1. I: The device emits a first signal containing a first low voltage and a second signal containing a second low voltage and a second high voltage higher than the second low voltage from the first terminal to the printing apparatus. 2. II: The first signal and the second signal are used when the printing apparatus determines that the first terminal is not shorted to the other terminals and that the board is being mounted on the printing apparatus. 3. III: The device emits the first signal to the first terminal and then emits the second signal to the first terminal. 4. IV: When the first terminal is not short-circuited with the other terminals, a clock signal is applied, consisting of a low voltage and a high voltage, which are alternately repeated at a predetermined interval from the printer to the second terminal. The device outputs the first low voltage as the first expected value from the first terminal to the printer during a first timing interval, while the voltage input to the second terminal is high. After the device outputs the first low voltage, it outputs the second high voltage as the second expected value from the first terminal to the printer during a second timing interval, while the voltage input to the second terminal is low.After the device outputs the second high voltage, it then outputs the second low voltage as a third expected value from the first terminal to the printer during a third timing interval, while the voltage input to the second terminal is high. Accordingly, the device outputs the first low voltage from the first terminal to the printer during the first predetermined timing interval, while the voltage input to the second terminal is high. After the device outputs the first low voltage, it then outputs the second high voltage from the first terminal to the printer during the second timing interval, while the voltage input to the second terminal is low.After the device outputs the second high voltage, it outputs the second low voltage from the first terminal to the printer during the third timing cycle, while the voltage input to the second terminal is high. Therefore, the device may be emitting the signal used to determine that the first terminal of the liquid housing is not short-circuited with the other terminals and that the liquid housing is being mounted on the printer. The board then relays the signal emitted by the device from the first terminal to the printer.Regardless of whether the fluid reservoir is mounted on the printing unit, it is possible to reduce the likelihood of the printing unit malfunctioning and the possibility of being unable to read from and write to the fluid reservoir. The board offers improvements in this respect beyond the related technical aspects. 18. In the previous aspect, when the first and second terminals are short-circuited, during the first timing step, the device may output a voltage with a value different from the expected value of the first terminal to the printer. During the second timing step, the device may output a voltage with a value different from the expected value of the first terminal to the printer. During the third timing step, the device may output a voltage with a value different from the expected value of the first terminal to the printer. Accordingly, it is possible to output a voltage indicating a short circuit from the board. 19. In the preceding aspect, when the first terminal and the second terminal are short-circuited during a period before the second timing interval after the first timing interval, in the first timing interval, the device may output a voltage equal to the first expected value from the first terminal to the printing apparatus. In the second timing interval, the device may output a voltage different from the second expected value from the first terminal to the printing apparatus. In the third timing interval, the device may output a voltage different from the third expected value from the first terminal to the printing apparatus. According to this aspect, the effect exhibited is similar to the effect in aspect (18) above. 20. In the preceding aspect, when the first and second terminals are short-circuited during a period before the third timing step after the second timing step, in the first timing step, the device may output a voltage equal to the first expected value from the first terminal to the printing apparatus. In the second timing step, the device may output a voltage equal to the second expected value from the first terminal to the printing apparatus. In the third timing step, the device may output a voltage different from the third expected value from the first terminal to the printing apparatus. According to this aspect, the effect exhibited is similar to the effect in aspect (18) above. 21. In the preceding aspect, when a short circuit between the first terminal and the second terminal is removed during a period before the second timing interval after the first timing interval, the device may output a voltage with a value different from the first expected value from the first terminal to the printing apparatus during the first timing interval. During the second timing interval, the device may output a voltage with a value equal to the second expected value from the first terminal to the printing apparatus. During the third timing interval, the device may output a voltage with a value equal to the third expected value from the first terminal to the printing apparatus. According to this aspect, the effect exhibited is similar to the effect in aspect (18) above. 22. In the preceding aspect, when a short circuit between the first terminal and the second terminal is removed during a period before the third timing interval after the second timing interval, in the first timing interval, the device may output a voltage with a value different from the first expected value from the first terminal to the printing apparatus. In the second timing interval, the device may output a voltage with a value different from the second expected value from the first terminal to the printing apparatus. In the third timing interval, the device may output a voltage with a value equal to the third expected value from the first terminal to the printing apparatus. According to this aspect, the effect exhibited is similar to the effect in aspect (18) above. 23. In the above aspect, the first terminal can be a data terminal, the second terminal can be a clock terminal, the first signal can be a first response signal as a response to the printing apparatus, and the second signal can be a second response signal as a response to the printing apparatus. 24. In the above aspect, the other terminals may include a third terminal and a fourth terminal. A reset signal containing a low voltage and a high voltage may be applied to the third terminal, and a power supply voltage may be applied to the fourth terminal. Based on this aspect, the printing apparatus may determine that the first terminal is not short-circuited with the second terminal, the third terminal, and the fourth terminal (which are included among the other terminals), and that the fluid reservoir is mounted on the printing apparatus, using the device. 25. In the preceding aspect, in at least one case where the first and third terminals are short-circuited and one case where the first and fourth terminals are short-circuited, during the first timing step, the device may output a voltage that differs from the first expected value from the first terminal to the printing apparatus. During the second timing step, the device may output a voltage equal to the second expected value from the first terminal to the printing apparatus. During the third timing step, the device may output a voltage different from the third expected value from the first terminal to the printing apparatus. According to this aspect, the effect exhibited is similar to the effect in aspect (18) above. 26. In the above aspect, during a period before the second timing step after the first timing step, in at least one case where the first and third terminals are short-circuited and one case where the first and fourth terminals are short-circuited, during the first timing step, the device may output a voltage equal to the first expected value from the first terminal to the printing apparatus. During the second timing step, the device may output a voltage equal to the second expected value from the first terminal to the printing apparatus. During the third timing step, the device may output a voltage different from the third expected value from the first terminal to the printing apparatus. According to this aspect, the effect exhibited is similar to the effect in aspect (18) above. 27. In the above aspect, during a period before the third timing step after the second timing step, in at least one case where the first and third terminals are short-circuited and one case where the first and fourth terminals are short-circuited, during the first timing step, the device may output a voltage equal to the first expected value from the first terminal to the printing apparatus. During the second timing step, the device may output a voltage equal to the second expected value from the first terminal to the printing apparatus. During the third timing step, the device may output a voltage different from the third expected value from the first terminal to the printing apparatus. According to this aspect, the effect exhibited is similar to the effect in aspect (18) above. 28. In the preceding aspect, during a period before the second timing step after the first timing step, when a short circuit between the first and third terminals is removed, and a short circuit between the first and fourth terminals is removed, the device may output a voltage with a value different from the first expected value of the first terminal to the printing apparatus. In the second timing step, the device may output a voltage with a value equal to the second expected value of the first terminal to the printing apparatus. In the third timing step, the device may output a voltage with a value equal to the third expected value of the first terminal to the printing apparatus. According to this aspect, the effect exhibited is similar to the effect in aspect (18) above. 29. In the preceding aspect, during a period before the third timing step after the second timing step, when a short circuit between the first and third terminals is removed, and a short circuit between the first and fourth terminals is removed, the device may output a voltage with a value different from the first expected value of the first terminal to the printing apparatus. In the second timing step, the device may output a voltage with a value equal to the second expected value of the first terminal to the printing apparatus. In the third timing step, the device may output a voltage with a value equal to the third expected value of the first terminal to the printing apparatus. According to this aspect, the effect exhibited is similar to the effect in aspect (18) above.

Claims

1. A liquid housing reservoir (100) configured to be mounted in a housing section (4) of a printing apparatus (20) comprising a print head (5), a liquid inlet portion (6) injecting liquid into the print head, the housing section provided with the liquid inlet portion, and a plurality of apparatus-side terminals (490) provided in the housing section,comprising the liquid housing reservoir: a liquid housing body (101) configured to house a liquid; a liquid supply portion (104) mounted on the liquid introduction portion of the printing apparatus and including a liquid supply orifice (104p) for supplying a liquid from the liquid housing body to the liquid introduction portion of the printing apparatus; a device (130); and a plurality of terminals (290) electrically coupled to the device, wherein the plurality of terminals includes a data terminal (210) and other terminals including a clock terminal (220), characterized in that the liquid housing reservoir is configured to comply with I, II, III, and IV as follows,I: The device (130) emits a first response signal (FS) containing a low first response signal voltage and a second response signal (SS) containing a low second response signal voltage and a high second response signal voltage higher than the low second response signal voltage, from the data terminal (210) to the printing apparatus (20), II: The first response signal (FS) and the second response signal (SS) emitted to the printing apparatus in use indicate that the data terminal (210) is not short-circuited with the other terminals and that the liquid housing reservoir is mounted on the printing apparatus, III: The device (130) emits the first response signal (FS) from the data terminal (210) to the printing apparatus (20), and once the device (130) emits the first response signal (FS),the device emits the second response signal (SS) from the data terminal (210) to the printing apparatus (20), and IV: when the data terminal (210) is not short-circuited with the other terminals, while the device (130) receives a clock signal (SCK) in which a low voltage and a high voltage are alternately repeated with a predetermined period that is introduced from the printing apparatus (20) to the clock terminal (220), the device (130) emits the first response signal low voltage as a first expected value from the data terminal (210) to the printing apparatus (20) in a first timing in a period in which a voltage introduced at the clock terminal (220) is the high voltage, once the device (130) emits the first response signal low voltage,The device emits the high voltage of the second response signal as a second expected value from the data terminal (210) to the printing apparatus (20) in a second timing cycle during a period in which the voltage applied to the clock terminal (220) is low voltage, and once the device (130) emits the high voltage of the second response signal, the device emits the low voltage of the second response signal as a third expected value from the data terminal (210) to the printing apparatus (20) in a third timing cycle during a period in which the voltage applied to the clock terminal (220) is high voltage.

2. The liquid housing reservoir according to claim 1, wherein when the data terminal (210) is not short-circuited with the other terminals, in one cycle of the clock signal (SCK),The device (130) emits the first low-voltage response signal to the data terminal before the first timing interval in the high-voltage period.

3. The liquid housing reservoir according to claim 1 or 2, wherein when the data terminal (210) is not short-circuited with the other terminals, in one cycle of the clock signal (SCK), the device (130) emits the second high-voltage response signal to the data terminal before the second timing interval in the low-voltage period.

4. The liquid housing reservoir according to any one of claims 1 to 3, wherein when the data terminal (210) is not short-circuited with the other terminals, in one cycle of the clock signal (SCK),The device (130) emits the low-voltage second response signal to the data terminal before the third timing event in the high-voltage period.

5. The liquid housing according to any one of claims 1 to 4, wherein when the data terminal (210) is not short-circuited with the other terminals, in one cycle of the clock signal (SCK), the device (130) emits the high-voltage second response signal to the data terminal (210) when the voltage applied to the clock terminal (220) changes from high voltage to low voltage, and the device (130) emits the low-voltage second response signal to the data terminal (210) when the voltage applied to the clock terminal (220) changes from low voltage to high voltage.

6. The liquid housing according to any one of claims 1 to 5,wherein when the data terminal (210) is not short-circuited with the other terminals, and when the voltage applied to the clock terminal (220) changes from low voltage to high voltage, the device (130) outputs the first low-voltage response signal to the data terminal.

7. The liquid housing reservoir according to any one of claims 1 to 6, wherein when the data terminal (210) and the clock terminal (220) are short-circuited, in the first timing step, the data terminal (210) outputs a voltage having a value different from the first expected value to the printing apparatus (20), in the second timing step, the data terminal (210) outputs a voltage having a value different from the second expected value to the printing apparatus (20), and in the third timing step,The data terminal (210) outputs a voltage having a value different from the third expected value to the printing apparatus (20).

8. The liquid housing reservoir according to any one of claims 1 to 7, wherein when the data terminal (210) and the clock terminal (220) are short-circuited during a period before the second timing interval after the first timing interval, during the first timing interval, the data terminal (210) outputs a voltage having a value equal to the first expected value to the printing apparatus (20), during the second timing interval, the data terminal (210) outputs a voltage having a value different from the second expected value to the printing apparatus (20), and during the third timing interval, the data terminal (210) outputs a voltage having a value different from the third expected value to the printing apparatus (20).

9. The liquid housing reservoir according to any one of claims 1 to 8,wherein when the data terminal (210) and the clock terminal (220) are short-circuited during a period before the third timing interval after the second timing interval, during the first timing interval, the data terminal (210) outputs a voltage equal to the first expected value to the printing apparatus (20), during the second timing interval, the data terminal (210) outputs a voltage equal to the second expected value to the printing apparatus (20), and during the third timing interval, the data terminal (210) outputs a voltage different from the third expected value to the printing apparatus (20).

10. The liquid housing reservoir according to any one of claims 1 to 9, wherein when a short circuit between the data terminal (210) and the clock terminal (220) is cleared during a period before the second timing interval after the first timing interval, during the first timing interval,The data terminal (210) outputs a voltage with a value different from the first expected value to the printing apparatus (20). In the second timing interval, the data terminal (210) outputs a voltage with a value equal to the second expected value to the printing apparatus (20). In the third timing interval, the data terminal (210) outputs a voltage with a value equal to the third expected value to the printing apparatus (20).

11. The liquid housing reservoir according to any one of claims 1 to 10, wherein when a short circuit between the data terminal (210) and the clock terminal (220) is removed during a period prior to the third timing interval after the second timing interval, in the first timing interval, the data terminal (210) outputs a voltage with a value different from the first expected value to the printing apparatus (20). In the second timing interval,The data terminal (210) outputs a voltage that has a different value from the second expected value to the printing apparatus (20), and in the third timing step, the data terminal (210) outputs a voltage that has a value equal to the third expected value to the printing apparatus (20).

12. The liquid housing reservoir according to claims 1 to 11, wherein the other terminals include a reset terminal (240) and a power supply terminal (230), the device (130) is configured to receive a reset signal (rst) containing a low-voltage input and a high-voltage input at the reset terminal (240), and to receive a power supply voltage (VDD) applied at the power supply terminal (230).

13. The liquid housing reservoir according to claim 12,wherein in at least one instance where the data terminal (210) and the reset terminal (240) are short-circuited and in one instance where the data terminal and the power supply terminal (230) are short-circuited, during the first timing interval, the data terminal (210) outputs a voltage having a value different from the first expected value to the printing apparatus (20), during the second timing interval, the data terminal (210) outputs a voltage having a value equal to the second expected value to the printing apparatus (20), and during the third timing interval, the data terminal (210) outputs a voltage having a value different from the third expected value to the printing apparatus (20).

14. The liquid holding reservoir according to claim 12 or 13, wherein during a period prior to the second timing interval after the first timing interval,In at least one instance where the data terminal (210) and the reset terminal (240) are short-circuited, and in one instance where the data terminal and the power supply terminal (230) are short-circuited, during the first timing interval, the data terminal (210) outputs a voltage equal to the first expected value to the printing apparatus (20); during the second timing interval, the data terminal (210) outputs a voltage equal to the second expected value to the printing apparatus (20); and during the third timing interval, the data terminal (210) outputs a voltage different from the third expected value to the printing apparatus (20).

15. The liquid holding tank according to any one of claims 12 to 14, wherein during a period prior to the third timing interval after the second timing interval,In at least one instance where the data terminal (210) and the reset terminal (240) are short-circuited, and in one instance where the data terminal and the power supply terminal (230) are short-circuited, during the first timing interval, the data terminal (210) outputs a voltage equal to the first expected value to the printing apparatus (20); during the second timing interval, the data terminal (210) outputs a voltage equal to the second expected value to the printing apparatus (20); and during the third timing interval, the data terminal (210) outputs a voltage different from the third expected value to the printing apparatus (20).

16. The liquid holding tank according to any one of claims 12 to 15, wherein during a period before the second timing interval after the first timing interval,When a short circuit between the data terminal (210) and the reset terminal (240) is removed, and a short circuit between the data terminal and the power supply terminal (230) is removed, in the first timing interval, the data terminal (210) outputs a voltage having a value different from the first expected value to the printing apparatus (20); in the second timing interval, the data terminal (210) outputs a voltage having a value equal to the second expected value to the printing apparatus (20); and in the third timing interval, the data terminal (210) outputs a voltage having a value equal to the third expected value to the printing apparatus (20).

17. The liquid holding tank according to any one of claims 12 to 16, wherein in a period before the third timing interval after the second timing interval,When a short circuit between the data terminal (210) and the reset terminal (240) is removed, and a short circuit between the data terminal and the power supply terminal (230) is removed, in the first timing step, the data terminal (210) emits a signal having a value different from the first expected value to the printing apparatus (20); in the second timing step, the data terminal (210) emits a signal having a value equal to the second expected value to the printing apparatus (20); and in the third timing step, the data terminal (210) emits a signal having a value equal to the third expected value to the printing apparatus (20).

18. The liquid holding tank according to any one of claims 12 to 17, wherein the device (130) is configured such that: after the power supply voltage (VDD) is applied to the power supply terminal (230),The high voltage is subsequently introduced into the reset terminal (240) by the reset signal (RST), changing from low voltage to high voltage, and the clock signal (SCK) is subsequently introduced into the clock terminal (220). The device (130) is configured to output the first answer signal (FS) to the data terminal (210).

19. The liquid housing reservoir according to any one of claims 12 to 18, wherein the power supply voltage (VDD) supplied to the power supply terminal (230) is used to operate the device (130).

20. The liquid housing reservoir according to any one of claims 1 to 19,wherein the device (130) is configured to be electrically coupled to additional terminals of the liquid housing reservoir in addition to the data terminal (210) and the other terminals.

21. The liquid housing reservoir according to any one of claims 1 to 20, wherein the device (130) is configured to perform the steps described in III and IV a plurality of times in at least one of (i) to (iii), (i) wherein, in the first timing, the data terminal (210) outputs a voltage having a value different from the first expected value of the first terminal to the printing apparatus (20), (ii) wherein, in the second timing, the data terminal (210) outputs a voltage having a value different from the second expected value of the first terminal to the printing apparatus (20), and (iii) wherein, in the third timing,The data terminal (210) outputs a voltage that has a different value from the third expected value of the first terminal to the printing apparatus (20).

22. The liquid housing reservoir according to any one of claims 1 to 21, wherein when the printing apparatus (20) receives a second print instruction while printing based on a first print instruction, the device (130) outputs the first response signal (FS) and the second response signal (SS) to the data terminal (210) before printing based on the second print instruction begins, after printing based on the first print instruction has ended.

23. The liquid housing reservoir according to any one of claims 1 to 22, wherein when the printing apparatus (20) receives a print head cleaning instruction (5),The device (130) emits the first response signal (FS) and the second response signal (SS) to the data terminal (210) before cleaning.

24. The liquid housing reservoir according to any one of claims 1 to 23, wherein the device (130) emits the first response signal (FS) and the second response signal (SS) to the data terminal (210) when the housing section (4) is located in a replacement position where replacement of the liquid housing reservoir is possible, and when the housing section (4) is moved from the replacement position to a standby position where replacement of the liquid housing reservoir is not possible, the device (130) emits the first response signal (FS) and the second response signal (SS) to the data terminal (210).

25. The liquid housing reservoir according to any one of claims 1 to 24,wherein the device (130) stores information relating to a liquid housed in the liquid housing tank.

26. The liquid housing tank according to any one of claims 1 to 25, wherein the device (130) is configured such that the first response signal (FS) and the second response signal (SS) are emitted to the data terminal (210) in response to a request signal (RS) input to the data terminal (210).

27. The liquid housing tank according to any one of claims 1 to 26, wherein the device (130) comprises a processor.

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