Serial communication cable, communication system and communication method

Abstract

The application discloses a serial communication cable, a communication system and a communication method. The serial communication cable comprises a power line, a grounding line, a first differential signal line, at least two second differential signal lines, an insulating outer cover and an insulating medium. The power line, the grounding line, the first differential signal line, the second differential signal lines and the insulating medium are located in the insulating outer cover. The power line, the grounding line, the first differential signal line and the second differential signal lines are insulated and separated by the insulating medium. The second differential signal lines are insulated and separated by the insulating medium. The first differential signal line can be combined with different second differential signal lines to form different differential signal line groups. During each communication, the elevator master control communicates with the external calling devices in an external calling group instead of all external calling devices. The increase of the communication nodes only affects the number of groups and does not affect the load capacity of the hardware communication circuit and the communication terminal resistance matching, thereby improving the communication quality.

Description

Technical Field

[0001] This invention relates to communication technology, and more particularly to a serial communication cable, a communication system, and a communication method. Background Technology

[0002] Currently, elevator call devices and elevator main control systems generally use a master-slave serial communication method to exchange data, with all call devices connected in parallel on a single serial communication bus. In high-rise buildings, due to the large number of elevator floors and call devices, the number of communication nodes on a single channel increases as they are connected to the existing serial communication bus.

[0003] When there are many communication nodes and the transmission distance is long, there will be some problems with the communication of the serial communication bus. For example, it is easily affected by external interference. The increase in nodes affects the load capacity of the hardware communication circuit. The increase in nodes affects the signal reflection of the serial communication bus. The increase in nodes affects the resistance value of the terminal matching resistor. All of these will lead to a decrease in communication quality. Summary of the Invention

[0004] This invention provides a serial communication cable, a communication system, and a communication method that do not affect the load-carrying capacity of the hardware communication circuit or the resistance matching of the communication terminal, thereby improving communication quality.

[0005] In a first aspect, the present invention provides a serial communication cable, comprising a power line, a ground line, a first differential signal line, at least two second differential signal lines, an insulating jacket, and an insulating medium;

[0006] The power line, the grounding line, the first differential signal line, the second differential signal line, and the insulating medium are all located inside the insulating jacket. The power line, the grounding line, the first differential signal line, and the second differential signal line are insulated and isolated from each other by the insulating medium. The second differential signal lines are also insulated and isolated from each other by the insulating medium.

[0007] The first differential signal line can be combined with different second differential signal lines to form different differential signal line groups.

[0008] Optionally, the grounding wire is located at the center of the insulating jacket, and the power line, the first differential signal line, and the second differential signal line are evenly arranged around the grounding wire.

[0009] Optionally, the insulating medium covers the power line, the grounding line, the first differential signal line, and the second differential signal line. The serial communication cable also includes a shielding layer, which covers the insulating medium, and the insulating jacket covers the shielding layer.

[0010] Optionally, the serial communication cable includes four of the second differential signal lines.

[0011] In a second aspect, the present invention also provides a communication system, including the serial communication cable provided in the first aspect, and further including an elevator main control, a first switching module and multiple outbound call devices, all of which are divided into multiple outbound call groups, and each outbound call group includes at least one outbound call device.

[0012] The power output terminal of the elevator main control unit is connected to the power input terminal of the external call device through the power line in the serial communication cable, and the grounding terminal of the elevator main control unit is connected to the grounding terminal of the external call device through the grounding line in the serial communication cable.

[0013] The first end of the first differential signal line in the serial communication cable is connected to the elevator main control, the second end of the first differential signal line is connected to all the outbound call devices, the first end of the second differential signal line in the serial communication cable is connected to the first switching module, and the second end of the second differential signal line is connected to the outbound call device in a corresponding outbound call group.

[0014] The elevator main control is connected to the first switching module. The elevator main control sends a switching signal to the first switching module, sequentially turning on the second differential signal lines, so that the first differential signal lines are combined with different second differential signal lines to form different differential signal line groups, thereby enabling the elevator main control to communicate with the outbound call devices in each of the outbound call groups.

[0015] Optionally, the first switching module is integrated into the elevator main control unit;

[0016] The elevator main control system includes a first main control module, a first communication module, a first switching module, and a first power supply module;

[0017] The first main control module is connected to the first switching module and the first communication module respectively;

[0018] The power output terminal of the first power module is connected to the power input terminal of the outbound calling device through the power line, and the ground terminal of the first power module is connected to the ground terminal of the outbound calling device through the grounding wire.

[0019] The first communication module is connected to the first switching module.

[0020] Thirdly, the present invention also provides a communication system, including the serial communication cable provided in the first aspect of the present invention, and further including an elevator main control, a plurality of second switching modules and a plurality of outbound call devices, all of the outbound call devices being divided into a plurality of outbound call groups, each of the outbound call groups including at least one outbound call device, all of the second switching modules being divided into a plurality of switching groups, and one of the second switching modules in each of the switching groups being connected to one of the outbound call devices in a corresponding outbound call group.

[0021] The power output terminal of the elevator main control unit is connected to the power input terminal of the external call device through the power line in the serial communication cable, and the grounding terminal of the elevator main control unit is connected to the grounding terminal of the external call device through the grounding line in the serial communication cable.

[0022] The first end of the first differential signal line in the serial communication cable is connected to the elevator main control, the second end of the first differential signal line is connected to all the external call devices, the first end of the second differential signal line in the serial communication cable is connected to the elevator main control, and the second end of the second differential signal line is connected to one of the second switching modules.

[0023] The elevator main control unit is connected to the second switching module via an enable signal line. The external call device sends a switching signal to the second switching module, sequentially activating the second differential signal lines. This allows the first differential signal line to be combined with different second differential signal lines to form different differential signal line groups, enabling the elevator main control unit to communicate with the external call devices in each of the external call groups.

[0024] Optionally, the second switching module is integrated into the corresponding outbound calling device;

[0025] The outbound calling device includes a second main control module, a second communication module, a second switching module, a second power module, a display module, and a button module;

[0026] The second main control module is connected to the second switching module, the second communication module, the display module, and the button module, respectively, and the elevator main control module is connected to the second switching module;

[0027] The power input terminal of the second power module is connected to the power output terminal of the elevator main control via the power line, and the ground input terminal of the second power module is connected to the ground terminal of the elevator main control via the grounding wire.

[0028] The second switching module is connected to a corresponding second communication module.

[0029] Fourthly, the present invention also provides a communication method based on the communication system provided in the second aspect of the present invention, the communication method comprising:

[0030] The elevator main control sends a switching signal to the first switching module, and the first switching module connects the first second differential signal line. The first differential signal line and the first second differential signal line form a differential signal line group.

[0031] The elevator main control unit communicates sequentially with the outbound call devices in the outbound call group connected to the first second differential signal line.

[0032] When the last outgoing call device in the outgoing call group connected by the first second differential signal line finishes communication, the elevator main control sends a switching signal to the first switching module, and the first switching module connects the second second differential signal line. This cycle repeats to enable the elevator main control to communicate with the outgoing call devices in all outgoing call groups connected by the second differential signal line.

[0033] When the last outbound call device in the outbound call group connected by the last second differential signal line completes communication, the process returns to the step of the elevator main control sending a switching signal to the first switching module, and the first switching module connecting the first second differential signal line.

[0034] Fifthly, the present invention also provides a communication method based on the communication system provided in the third aspect of the present invention, the communication method comprising:

[0035] The elevator main control sends an enable signal to the second switching module in the first switching group via the enable signal line, thereby enabling the second switching module in the first switching group.

[0036] The first outbound call device in the first outbound call group sends a switching signal to the first second switching module in the first switching group, connecting the first second differential signal line;

[0037] The elevator main control unit communicates with the first outbound call device in the first outbound call group;

[0038] When the elevator main control completes communication with the first outgoing device in the first outgoing call group, the second outgoing device in the first outgoing call group sends a switching signal to the second second switching module in the first switching group. This cycle is repeated to achieve communication between the elevator main control and all outgoing devices in the first outgoing call group.

[0039] When the elevator main control finishes communicating with the last outgoing call device in the first outgoing call group, the elevator main control sends an enable signal to the second switching module in the second switching group through the enable signal line. This cycle is repeated to enable the elevator main control to communicate with all outgoing call devices.

[0040] When the elevator main control has finished communicating with all the outgoing call devices in the last outgoing call group, it returns to the step of sending an enable signal to the second switching module in the first switching group through the enable signal line.

[0041] The serial communication cable provided by this invention includes a power line, a ground line, one first differential signal line, at least two second differential signal lines, an insulating jacket, and an insulating medium. The power line, ground line, first differential signal line, second differential signal line, and insulating medium are all located within the insulating jacket. The power line, ground line, first differential signal line, and second differential signal line are insulated from each other by the insulating medium. The second differential signal lines are also insulated from each other by the insulating medium. The first differential signal line can be combined with different second differential signal lines to form different differential signal line groups. During each communication, the elevator main control does not communicate with all outgoing call devices, but only with the outgoing call devices within a single outgoing call group. The increase in communication nodes only affects the number of groups and does not affect the load capacity of the hardware communication circuit or the resistance matching of the communication terminal, thus improving communication quality. Attached Figure Description

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0043] Figure 1 This is a schematic diagram of the structure of a serial communication cable provided in an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of the structure of a communication system provided in an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of an elevator main control system in another communication system provided by an embodiment of the present invention;

[0046] Figure 4 A schematic diagram of another communication system provided in an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of an outbound calling device in another communication system provided by an embodiment of the present invention. Detailed Implementation

[0048] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Moreover, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0051] Figure 1 This is a schematic diagram of the structure of a serial communication cable provided in an embodiment of the present invention, as shown below. Figure 1 As shown, it includes a power line VCC, a ground line GND, a first differential signal line R1, at least two second differential signal lines R2, an insulating jacket CL, and an insulating dielectric DL. For example, in... Figure 1 The following example illustrates a serial communication cable comprising four second differential signal lines R2.

[0052] Among them, the power line VCC, the ground line GND, the first differential signal line R1, the second differential signal line R2 and the insulating medium DL are all located inside the insulating jacket CL. The power line VCC, the ground line GND, the first differential signal line R1 and the second differential signal line R2 are insulated and isolated from each other by the insulating medium DL. The second differential signal lines R2 are also insulated and isolated from each other by the insulating medium DL.

[0053] The first differential signal line R1 can be combined with different second differential signal lines R2 to form different differential signal line groups.

[0054] For example, the serial communication cable is used for communication between the elevator main control and the call devices. The elevator main control is connected to all call devices via a power supply line VCC. The elevator main control supplies power to the call devices via VCC. The elevator main control and all call devices are connected via a grounding line GND, ensuring that the elevator main control and all call devices share a common ground. All call devices can be divided into multiple call groups, each containing multiple call devices. For example, with 96 call devices and the serial communication cable including four second differential signal lines R2, the 96 call devices are divided into 4 call groups, each containing 24 call devices. The elevator main control is connected to all call devices via a first signal line R1. Call devices within a call group are connected to the elevator main control via a second signal line R2. During elevator operation, the first second differential signal line R2 is first activated, forming a differential signal line group with the first signal line R1, enabling communication between the elevator main control and the call devices in the call group corresponding to the second differential signal line R2. Next, the second differential signal line R2 is connected, forming a differential signal line group with the first signal line R1. This enables communication between the elevator main control and the call devices in the call group corresponding to the second differential signal line R2. This process is repeated to achieve communication between the elevator main control and all call devices. In this embodiment, during each communication, the elevator main control does not communicate with all call devices, but only with the call devices within a single call group. The increase in communication nodes only affects the number of groups and does not affect the load capacity of the hardware communication circuit or the resistance matching of the communication terminal, thus improving communication quality.

[0055] The serial communication cable provided in this embodiment of the invention includes a power line, a ground line, one first differential signal line, at least two second differential signal lines, an insulating jacket, and an insulating medium. The power line, ground line, first differential signal line, second differential signal lines, and insulating medium are all located within the insulating jacket. The power line, ground line, first differential signal line, and second differential signal lines are insulated from each other by the insulating medium. The second differential signal lines are also insulated from each other by the insulating medium. The first differential signal line can be combined with different second differential signal lines to form different differential signal line groups. During each communication, the elevator main control does not communicate with all outgoing call devices, but only with the outgoing call devices within a single outgoing call group. The increase in communication nodes only affects the number of groups and does not affect the load capacity of the hardware communication circuit or the resistance matching of the communication terminal, thus improving communication quality.

[0056] In some embodiments of the present invention, such as Figure 1 As shown, the grounding wire GND is located at the center of the insulating jacket CL, and the power supply line VCC, the first differential signal line R1, and the second differential signal line R2 are evenly arranged around the grounding wire GND.

[0057] In some embodiments of the present invention, such as Figure 1 As shown, the insulating medium DL covers the power line VCC, the ground line GND, the first differential signal line R1, and the second differential signal line R2. The serial communication cable also includes a shielding layer SL, which covers the insulating medium, and an insulating outer jacket CL covers the shielding layer SL. The shielding layer SL can be a metal layer, used to shield external signals from interference to the communication of the first differential signal line R1 and the second differential signal line R2 in the serial communication cable.

[0058] For example, in an embodiment of the invention, taking an elevator with one call device per floor as an example, and each call group connected by a second differential signal line R2 comprising 24 call devices, i.e., 24 floors as a group, then when there are more than 24 floors, an additional second differential signal line R2 is added to the cable; when there are more than 48 floors, another second differential signal line R2 is added, and so on. Generally, elevators do not exceed 100 floors; therefore, the number of second differential signal lines R2 usually does not exceed four. For example, in an embodiment of the invention, the serial communication cable includes four second differential signal lines R2.

[0059] This invention also provides a communication system. Figure 2 A schematic diagram of the structure of a communication system provided in an embodiment of the present invention is shown below. Figure 2 As shown, the communication system includes the serial communication cable 110 provided in any of the foregoing embodiments of the present invention, and also includes an elevator main control unit 120, a first switching module 130, and multiple outbound call devices 140. All outbound call devices 140 are divided into multiple outbound call groups, and each outbound call group includes at least one outbound call device. For example, as... Figure 2 As shown, it includes 96 outbound calling devices, which are divided into 4 outbound calling groups: group 1, group 2, group 3 and group 4. Each outbound calling group includes 24 outbound calling devices.

[0060] The power output terminal of the elevator main control unit 120 is connected to the power input terminal of all external call devices 140 through the power line VCC in the serial communication cable 110, and the ground terminal of the elevator main control unit 120 is connected to the ground terminal of the external call device 140 through the ground line GND in the serial communication cable 110.

[0061] The first end of the first differential signal line R1 in the serial communication cable 110 is connected to the elevator main control 120, and the second end of the first differential signal line R1 is connected to all outbound call devices 140. The first end of the second differential signal line in the serial communication cable 110 is connected to the first switching module 130, and the second end of the second differential signal line is connected to the outbound call device 140 in a corresponding outbound call group. For example, for ease of explanation, in this embodiment of the invention, the four second differential signal lines are labeled as R21, R22, R23, and R24, wherein R21 connects to the outbound call device in group 1, R22 connects to the outbound call device in group 2, R23 connects to the outbound call device in group 3, and R24 connects to the outbound call device in group 4.

[0062] The elevator main control unit 120 is connected to the first switching module 130. The elevator main control unit 120 sends a switching signal to the first switching module 130, sequentially activating the second differential signal lines. This allows the first differential signal line R1 to be combined with different second differential signal lines to form different differential signal line groups, enabling the elevator main control unit 120 to communicate with the call devices 140 in each call group. For example, the first switching module 130 may include multiple switching switches (e.g., relays, solid-state relays, etc.), which, through the operation of the switching switches, achieve switching between the various second differential signal lines.

[0063] For example, the communication method of this communication system is as follows:

[0064] 1. The elevator main control 120 sends a switching signal to the first switching module 130. The first switching module 130 connects the first second differential signal line R21. The first differential signal line R1 and the first second differential signal line R21 form a differential signal line group.

[0065] 2. The elevator main control unit 120 communicates sequentially with the 24 outbound call devices in the outbound call group (i.e., group 1) connected to the first second differential signal line R21.

[0066] 3. When the last call device in the call group connected by the first second differential signal line R21 completes communication, the elevator main control 120 sends a switching signal to the first switching module 130. The first switching module 130 then connects the second second differential signal line R22 to enable communication with the call devices in group 2. This process is repeated to enable communication between the elevator main control 120 and all call devices in the call groups connected by the second differential signal lines.

[0067] 4. When the last outgoing call device in the outgoing call group (group 4) connected by the last second differential signal line R24 finishes communication, return to the step of the elevator main control 120 sending a switching signal to the first switching module 130, and the first switching module 130 connecting the first second differential signal line R21, and so on.

[0068] Figure 3 This is a schematic diagram of the structure of an elevator main control system in another communication system provided by an embodiment of the present invention. Figure 2 A further improvement upon the aforementioned embodiment is made in this embodiment, where the first switching module is integrated into the elevator main control unit. Figure 2 The same parts as those in the described embodiments will not be repeated here. For example, as shown... Figure 3 As shown, the first switching module 130 is integrated into the elevator main control 120. The elevator main control 120 includes a first main control module 121, a first communication module 122, a first switching module 130, and a first power module 123.

[0069] The first main control module 121 is connected to the first switching module 130 and the first communication module 122 respectively. The power output terminal of the first power module 123 is connected to the power input terminal of the outbound calling device through the power line VCC, and the ground terminal of the first power module 123 is connected to the ground terminal of the outbound calling device through the grounding wire GND. The first communication module 122 is connected to the first switching module 130.

[0070] Figure 4 A schematic diagram of another communication system provided in an embodiment of the present invention, such as... Figure 4 As shown, the communication system includes the serial communication cable 210 provided in any of the foregoing embodiments of the present invention, and also includes an elevator main control unit 220, multiple second switching modules 230, and multiple outbound call devices 240. All outbound call devices 240 are divided into multiple outbound call groups, each outbound call group including at least one outbound call device 240. All second switching modules 230 are divided into multiple switching groups, and one second switching module 230 in each switching group is connected to one outbound call device 240 in the corresponding outbound call group. For example, as... Figure 2 As shown, the system includes 96 outbound calling devices and 96 second switching modules 230. The 96 outbound calling devices are divided into four outbound calling groups: Group 1, Group 2, Group 3, and Group 4. Each outbound calling group includes 24 outbound calling devices. The 96 second switching modules 230 are also divided into four groups.

[0071] The power output terminal of the elevator main control unit 120 is connected to the power input terminal of all external call devices 240 through the power line VCC in the serial communication cable 210, and the ground terminal of the elevator main control unit 220 is connected to the ground terminal of all external call devices 240 through the ground line GND in the serial communication cable 210.

[0072] The first end of the first differential signal line R1 in the serial communication cable 210 is connected to the elevator main control 210, and the second end of the first differential signal line R1 is connected to all external call devices 240. The first end of the second differential signal line R2 in the serial communication cable 210 is connected to the elevator main control 220, and the second end of the second differential signal line R2 is connected to a second switching module 230. For illustrative purposes, in this embodiment of the invention, the four second differential signal lines are labeled R21, R22, R23, and R24, wherein R21 is connected to the second switching module 230 of group 1, R22 is connected to the second switching module 230 of group 2, R23 is connected to the second switching module 230 of group 3, and R24 is connected to the second switching module 230 of group 4.

[0073] The elevator main control unit 220 and the second switching module 230 are connected via an enable signal line (not shown in the figure). The external call device 240 sends a switching signal to the second switching module 230, sequentially activating the second differential signal lines R2. This allows the first differential signal line R1 to combine with different second differential signal lines R2 to form different differential signal line groups, enabling the elevator main control unit 220 to communicate with the external call devices 240 in each external call group. For example, the second switching module 230 may include a switching switch (e.g., a relay, a solid-state relay, etc.), which, through the operation of the switching switch, enables switching between the different second differential signal lines R2.

[0074] For example, the communication method of this communication system is as follows:

[0075] 1. The elevator main controller 220 sends an enable signal to the second switching module 230 in the first switching group (group 1) via the enable signal line, enabling the second switching module 230 in the first switching group (group 1).

[0076] 2. The first outbound call device 240 in the first outbound call group (group 1) sends a switching signal to the first second switching module 230 in the first switching group (group 1) to connect the first second differential signal line R21.

[0077] 3. The elevator main control unit 220 communicates with the first outbound call device 240 in the first outbound call group (group 1).

[0078] 4. When the elevator main control 220 finishes communicating with the first outgoing call device 240 in the first outgoing call group (group 1), the second outgoing call device 240 in the first outgoing call group (group 1) sends a switching signal to the second second switching module 230 in the first switching group (group 1), thereby realizing communication between the elevator main control 220 and the second outgoing call device 240 in the first outgoing call group (group 1). This process is repeated to realize communication between the elevator main control 220 and all outgoing call devices 240 in the first outgoing call group (group 1).

[0079] 5. When the elevator main control unit 220 finishes communicating with the last call device 240 in the first call group (Group 1), the elevator main control unit 220 sends an enable signal to the second switching module 240 in the second switching group (Group 2) via the enable signal line. Similarly, this enables the elevator main control unit 220 to communicate with all call devices 240 in the second call group (Group 2). This process is repeated to achieve communication between the elevator main control unit 220 and all call devices 240.

[0080] 6. When the elevator main control 220 has finished communicating with all the call devices 240 in the last call group (group 4), return to the step of sending an enable signal from the elevator main control 220 to the second switching module 230 in the first switching group (group 1) through the enable signal line, and repeat this process.

[0081] Figure 5 This is a schematic diagram of the structure of an outbound calling device in another communication system provided by an embodiment of the present invention. Figure 4 A further improvement upon the aforementioned embodiment is made in this embodiment, where the second switching module is integrated into the outbound calling device. Figure 4 The same parts as those in the described embodiments will not be repeated here. For example, as shown... Figure 5 As shown, the second switching module 230 is integrated into the corresponding outbound calling device 240. The outbound calling device 240 includes a second main control module 241, a second communication module 242, a second switching module 230, a second power module 243, a display module 244, and a keypad module 245.

[0082] The second main control module 241 is connected to the second switching module 230, the second communication module 242, the display module 244 and the button module 245 respectively, and the elevator main control module 241 is connected to the second switching module 230.

[0083] The power input terminal of the second power module 243 is connected to the power output terminal of the elevator main control via a power line VCC. The ground input terminal of the second power module 243 is connected to the ground terminal of the elevator main control via a grounding wire GND. The second switching module 230 is connected to a corresponding second communication module 242. The second switching module 230 is connected to the elevator main control via an enable signal line EN. For example, the second switching module 230 is connected to the elevator main control via a corresponding second differential signal line R2, and the second differential signal line R2 is connected to the second communication module 242 after passing through the second switching module 230. The second communication module 242 is connected to the elevator main control via a first differential signal line R1.

[0084] The button module 245 can respond to the user's call action, generate a call signal, and transmit it to the elevator main control via the second communication module 242 and a serial communication cable. The elevator main control can transmit the elevator's operating information (e.g., the current floor of the car and the direction of elevator travel) to the external call device via the second communication module 242 and the serial communication cable, and display it on the display module 244.

[0085] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0086] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0087] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0088] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A serial communication cable, characterized in that, Includes a power line, a grounding wire, a first differential signal line, at least two second differential signal lines, an insulating jacket, and an insulating dielectric. The power line, the grounding line, the first differential signal line, the second differential signal line, and the insulating medium are all located inside the insulating jacket. The power line, the grounding line, the first differential signal line, and the second differential signal line are insulated and isolated from each other by the insulating medium. The second differential signal lines are also insulated and isolated from each other by the insulating medium. The first differential signal line can be combined with different second differential signal lines to form different differential signal line groups.

2. The serial communication cable according to claim 1, characterized in that, The grounding wire is located at the center of the insulating jacket, and the power line, the first differential signal line, and the second differential signal line are evenly arranged around the grounding wire.

3. The serial communication cable according to claim 1, characterized in that, The insulating medium covers the power line, the grounding line, the first differential signal line, and the second differential signal line. The serial communication cable also includes a shielding layer, which covers the insulating medium, and the insulating jacket covers the shielding layer.

4. The serial communication cable according to any one of claims 1-3, characterized in that, The serial communication cable includes four second differential signal lines.

5. A communication system, characterized in that, The system includes the serial communication cable as described in any one of claims 1-4, and also includes an elevator main control unit, a first switching module, and multiple outbound call devices. All the outbound call devices are divided into multiple outbound call groups, and each outbound call group includes at least one outbound call device. The power output terminal of the elevator main control unit is connected to the power input terminal of the external call device through the power line in the serial communication cable, and the grounding terminal of the elevator main control unit is connected to the grounding terminal of the external call device through the grounding line in the serial communication cable. The first end of the first differential signal line in the serial communication cable is connected to the elevator main control, the second end of the first differential signal line is connected to all the outbound call devices, the first end of the second differential signal line in the serial communication cable is connected to the first switching module, and the second end of the second differential signal line is connected to the outbound call device in a corresponding outbound call group. The elevator main control is connected to the first switching module. The elevator main control sends a switching signal to the first switching module, sequentially turning on the second differential signal lines, so that the first differential signal lines are combined with different second differential signal lines to form different differential signal line groups, thereby enabling the elevator main control to communicate with the outbound call devices in each of the outbound call groups.

6. The communication system according to claim 5, characterized in that, The first switching module is integrated into the elevator main control unit; The elevator main control system includes a first main control module, a first communication module, a first switching module, and a first power supply module; The first main control module is connected to the first switching module and the first communication module respectively; The power output terminal of the first power module is connected to the power input terminal of the outbound calling device through the power line, and the ground terminal of the first power module is connected to the ground terminal of the outbound calling device through the grounding wire. The first communication module is connected to the first switching module.

7. A communication system, characterized in that, The system includes the serial communication cable as described in any one of claims 1-4, and further includes an elevator main control unit, multiple second switching modules, and multiple outbound call devices. All the outbound call devices are divided into multiple outbound call groups, and each outbound call group includes at least one outbound call device. All the second switching modules are divided into multiple switching groups, and one of the second switching modules in each switching group is connected to one of the outbound call devices in the corresponding outbound call group. The power output terminal of the elevator main control unit is connected to the power input terminal of the external call device through the power line in the serial communication cable, and the grounding terminal of the elevator main control unit is connected to the grounding terminal of the external call device through the grounding line in the serial communication cable. The first end of the first differential signal line in the serial communication cable is connected to the elevator main control, the second end of the first differential signal line is connected to all the external call devices, the first end of the second differential signal line in the serial communication cable is connected to the elevator main control, and the second end of the second differential signal line is connected to one of the second switching modules. The elevator main control unit is connected to the second switching module via an enable signal line. The external call device sends a switching signal to the second switching module, sequentially activating the second differential signal lines. This allows the first differential signal line to be combined with different second differential signal lines to form different differential signal line groups, enabling the elevator main control unit to communicate with the external call devices in each of the external call groups.

8. The communication system according to claim 7, characterized in that, The second switching module is integrated into the corresponding outbound calling device; The outbound calling device includes a second main control module, a second communication module, a second switching module, a second power module, a display module, and a button module; The second main control module is connected to the second switching module, the second communication module, the display module, and the button module, respectively, and the elevator main control module is connected to the second switching module; The power input terminal of the second power module is connected to the power output terminal of the elevator main control via the power line, and the ground input terminal of the second power module is connected to the ground terminal of the elevator main control via the grounding wire. The second switching module is connected to a corresponding second communication module.

9. A communication method, characterized in that, Based on the communication system of claim 5 or 6, the communication method includes: The elevator main control sends a switching signal to the first switching module, and the first switching module connects the first second differential signal line. The first differential signal line and the first second differential signal line form a differential signal line group. The elevator main control unit communicates sequentially with the outbound call devices in the outbound call group connected to the first second differential signal line. When the last outgoing call device in the outgoing call group connected by the first second differential signal line finishes communication, the elevator main control sends a switching signal to the first switching module, and the first switching module connects the second second differential signal line. This cycle repeats to enable the elevator main control to communicate with the outgoing call devices in all outgoing call groups connected by the second differential signal line. When the last outbound call device in the outbound call group connected by the last second differential signal line completes communication, the process returns to the step of the elevator main control sending a switching signal to the first switching module, and the first switching module connecting the first second differential signal line.

10. A communication method, characterized in that, Based on the communication system of claim 7 or 8, the communication method includes: The elevator main control sends an enable signal to the second switching module in the first switching group via the enable signal line, thereby enabling the second switching module in the first switching group. The first outbound call device in the first outbound call group sends a switching signal to the first second switching module in the first switching group, connecting the first second differential signal line; The elevator main control unit communicates with the first outbound call device in the first outbound call group; When the elevator main control completes communication with the first outgoing device in the first outgoing call group, the second outgoing device in the first outgoing call group sends a switching signal to the second second switching module in the first switching group. This cycle is repeated to achieve communication between the elevator main control and all outgoing devices in the first outgoing call group. When the elevator main control finishes communicating with the last outgoing call device in the first outgoing call group, the elevator main control sends an enable signal to the second switching module in the second switching group through the enable signal line. This cycle is repeated to enable the elevator main control to communicate with all outgoing call devices. When the elevator main control has finished communicating with all the outgoing call devices in the last outgoing call group, it returns to the step of sending an enable signal to the second switching module in the first switching group through the enable signal line.

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