RS485 communication remote communication control module

Abstract

The utility model discloses an RS485 communication remote communication control module, which belongs to the field of communication, and comprises an RS485 interface, the RS485 interface comprises a 9-core plug seat of a DB-9, the plug seat comprises a support plate, a shell and a joint arranged in the shell, the shell is arranged on one side plate surface of the support plate, a positioning block is arranged in front of a jack of the shell, and the jack of the shell is connected with the joint. A clamping groove is formed in the bottom of the positioning block, the clamping groove is matched with the upper half part of the plug in shape, the upper half part of the plug is clamped in the clamping groove, the width of the clamping groove is smaller than that of the corresponding part of the plug, and the clamping groove is detachably connected with the upper half part of the plug; a horizontally-placed horizontal telescopic rod is installed on the top face of the positioning block, the fixed end of the horizontal telescopic rod is installed on a vertically-placed lifting column, and the fixed end of the lifting column is installed on the top face of the shell. The DB-9 connector assembly solves the problem that the DB-9 connector assembly cannot be used normally due to the fact that the pins on the DB-9 connector assembly and the holes on the plug are easy to misplace and the pins are easy to bend and deform after misplacement.

Description

Technical Field

[0001] The utility model belongs to the field of communication and relates to an RS485 communication remote communication control module. Background Art

[0002] The RS485 communication remote communication control module is mainly used to realize the conversion between serial port RS485 data and IP data and is widely used in the Internet of Things industry. The RS485 communication remote communication control module mainly includes the following hardware devices: an RS485 interface, an Ethernet interface, a wireless module, a power supply module, etc. Among them, the RS485 interface is connected using a DB-9 (also known as D-sub 9) plug socket. DB-9 is a 9-pin connector. Currently, when in use, since DB-9 is a 9-pin connector with a relatively large number of pins, when the plug is inserted, the pins on the DB-9 plug socket are prone to misalignment with the holes on the plug. After misalignment, the pins are easily bent and deformed, making the DB-9 plug socket unable to be used normally. Content of the Utility Model

[0003] The purpose of the utility model is to provide an RS485 communication remote communication control module, which solves the problem that since DB-9 is a 9-pin connector with a relatively large number of pins, when the plug is inserted, the pins on the DB-9 plug socket are prone to misalignment with the holes on the plug. After misalignment, the pins are easily bent and deformed, making the DB-9 plug socket unable to be used normally.

[0004] The technical solution adopted by the utility model is as follows:

[0005] The RS485 communication remote communication control module includes an RS485 interface. The RS485 interface includes a 9-core plug socket of DB-9. The plug socket includes a support plate, a housing provided with insertion holes, and a connector installed inside the insertion holes of the housing. The housing is installed on one side surface of the support plate. There are 9 pins on the connector. A positioning block is provided in front of the insertion holes of the housing. A card slot is opened at the bottom of the positioning block. The card slot matches the shape of the plug inserted into the housing and connected to the connector. The bottom surface of the card slot is completely open. The card slot matches the shape of the upper half of the plug and the upper half of the plug is clamped in the card slot. The width of the card slot is smaller than the width of the corresponding part of the plug. The card slot is detachably connected to the upper half of the plug. A horizontally placed horizontal telescopic rod is installed on the top surface of the positioning block. The movable end of the horizontal telescopic rod is fixedly connected to the top surface of the positioning block. The fixed end of the horizontal telescopic rod is installed on a vertically placed lifting column. The movable end of the lifting column is fixedly connected to the fixed end of the horizontal telescopic rod. The fixed end of the lifting column is installed on the top surface of the housing.

[0006] When the lifting column sinks to the lowest position, the insertion holes on the plug clamped into the card slot are aligned with the pins on the connector one by one, and the central axes of the mutually aligned insertion holes and pins coincide.

[0007] In the utility model, a positioning block with a card slot is arranged on the outer shell of the connector. The positioning block is fixedly connected to the outer shell through a horizontal telescopic rod and a lifting column. When the lifting column is in the initial state (the shortest length), the card slot on the positioning block is aligned with the connector. After the upper half of the plug is clamped into the card slot, the jacks on the plug correspond one by one with the pins on the connector, and the corresponding jacks and pins are in alignment. Pushing the positioning block along the flattening direction can make the pins on the connector correspondingly insert into the holes on the plug one by one, in one-to-one correspondence without misalignment, solving the problem that the DB-9 is a 9-pin connector. Due to the large number of pins, when the plug is inserted, the pins on the DB-9 plug socket are easily misaligned with the holes on the plug. After misalignment, the pins are easily bent and deformed, making the DB-9 plug socket unable to be used normally.

[0008] In the utility model, the positioning block is used to clamp the plug. The horizontal telescopic rod and the lifting column are the connection structures between the positioning block and the outer shell, realizing the vertical and horizontal movement of the positioning block. In the initial state, the lifting column sinks to the shortest, and the upper half of the plug is clamped into the card slot of the positioning block. The clamping direction can be from bottom to top or horizontally pushed in. After the upper half of the plug is clamped into the card slot, the side surface of the plug with jacks is located outside the card slot. Subsequently, pushing the positioning block in the direction of the connector, the horizontal telescopic rod shortens in the direction of the connector, and the positioning block drives the plug to move in the direction of the connector until the pins on the connector correspondingly insert into the jacks on the plug. At this time, only part of the pins are inserted into the jacks. When the positioning block is blocked by the outer shell and cannot move further, operate the lifting column to make the movable end of the lifting column move upward. During the upward movement of the movable end of the lifting column, the positioning block can be pulled upward, separating the positioning block from the plug. Subsequently, pushing the plug further in the direction of the connector can make the pins on the connector completely insert into the corresponding jacks, accurately completing the insertion of the 9-core plug socket of the DB-9.

[0009] Further, the horizontal telescopic rod includes a cylindrical tube with a hollow interior. One end of the cylindrical tube is provided with a through hole for the sliding rod to insert. Part of the sliding rod enters the interior of the cylindrical tube through the through hole. The sliding rod is coaxial with the cylindrical tube and is slidably connected. The inner diameter of the cylindrical tube is larger than the diameter of the sliding rod. A circular limiting plate coinciding with the central axis of the sliding rod is installed outside the sliding rod. The circular limiting plate is located inside the cylindrical tube and the outer diameter of the circular limiting plate is larger than the diameter of the through hole on the end face of the cylindrical tube. The circular limiting plate is slidably connected to the cylindrical tube. The end of the sliding rod located outside the cylindrical tube is fixedly connected to the top surface of the positioning block. The end face of the cylindrical tube opposite to the through hole is fixedly connected to the movable end of the lifting column.

[0010] In the present utility model, the cylindrical tube and the sliding rod are the main parts of the horizontal telescopic rod. The sliding rod reciprocates axially inside the cylindrical tube. The sliding rod is fixedly connected to the positioning block. When the sliding rod makes a linear reciprocating motion inside the cylindrical tube, it can drive the positioning block to make a linear reciprocating motion. The operation is simple and the equipment maintenance cost is low. The circular limiting plate outside the sliding rod is used to prevent the sliding rod from being completely pulled out of the cylindrical tube and separating the sliding rod from the cylindrical tube.

[0011] Further, the lifting column includes a vertically placed sleeve. An activity rod coinciding with the central axis of the sleeve is inserted inside the sleeve. The activity rod is slidably connected to the sleeve. A spring button is arranged on the tube wall of the activity rod. Two locking holes arranged in sequence along the axial direction of the sleeve are arranged on the tube wall of the sleeve. The locking holes are through holes matching the shape of the spring button and for the spring button to pop into. The upper end of the activity rod is fixedly connected to the fixed end of the horizontal telescopic rod. The lower end of the sleeve is installed on the top surface of the housing. When the activity rod slides to the spring button popping into the lowermost locking hole, the jacks on the plug inserted into the card slot are aligned with the pins on the connector one by one, and the central axes of the mutually aligned jacks and pins coincide.

[0012] In the present utility model, the sleeve and the activity rod are the main structures of the lifting column. The up and down movement of the activity rod inside the sleeve drives the up and down movement of the positioning block. The activity rod and the sleeve are locked tightly through the matching spring button and locking hole. Pressing down the spring button can pull the activity rod. When the activity rod moves to the current position, the spring button will pop into the corresponding locking hole for locking. The operation is simple. The present utility model is provided with two locking holes. When the spring button is stuck into the upper locking hole, the positioning block is completely separated from the plug. When the spring button is stuck into the lower locking hole, the card slot on the positioning block is aligned with the connector for plugging the plug into the connector.

[0013] Further, the horizontal telescopic rod and the lifting column are fixedly connected by bolts.

[0014] Further, the positioning block is an elastic rubber block. The elastic rubber block has a certain elastic deformation. When the positioning block is pulled up, it can buffer the extrusion force between the positioning block and the plug to a certain extent.

[0015] Further, the outer diameter of the circular limiting plate is equal to the inner diameter of the cylindrical tube and the circular limiting plate is slidably connected to the inside of the cylindrical tube.

[0016] The outer diameter of the circular limiting plate is equal to the inner diameter of the cylindrical tube, so the circular limiting plate is in close contact with the inner wall of the cylindrical tube. The cylindrical tube plays a supporting role for the circular limiting plate and the sliding rod on the circular limiting plate, and the stability of the sliding rod during use is higher.

[0017] To sum up, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are:

[0018] 1. In the RS485 communication remote communication control module of the present utility model, a positioning block with a card slot is provided on the outer shell of the connector, which can enable the pins on the connector to be inserted into the holes on the plug one by one, corresponding to each other without misalignment, solving the problem that the DB-9 is a 9-pin connector. Due to the large number of pins, when the plug is inserted, the pins on the DB-9 plug socket are prone to misalignment with the holes on the plug. After misalignment, the pins are easily bent and deformed, making the DB-9 plug socket unable to be used normally.

[0019] 2. In the present utility model, the cylindrical barrel and the sliding rod are the main parts of the horizontal telescopic rod. The sliding rod reciprocates along the axial direction inside the cylindrical barrel. The sliding rod is fixedly connected to the positioning block. When the sliding rod makes a linear reciprocating motion inside the cylindrical barrel, it can drive the positioning block to make a linear reciprocating motion. The operation is simple and the equipment maintenance cost is low.

[0020] 3. In the present utility model, the sleeve and the movable rod are the main structures of the lifting column. When the movable rod moves up and down inside the sleeve, it drives the positioning block to move up and down. The movable rod and the sleeve are locked by a matching spring button and lock hole. Pressing down the spring button can pull the movable rod. When the movable rod moves to the current position, the spring button will pop into the corresponding lock hole for locking. The operation is simple.

[0021] 4. In the present utility model, the outer diameter of the circular limiting plate is equal to the inner diameter of the cylindrical barrel. The circular limiting plate is in close contact with the inner wall of the cylindrical barrel. The cylindrical barrel plays a supporting role for the circular limiting plate and the sliding rod on the circular limiting plate. The stability of the sliding rod during use is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings, where:

[0023] Figure 1 is a schematic structural diagram of the 9-pin plug socket of DB-9 in the RS485 communication remote communication control module;

[0024] Figure 2 is a schematic structural diagram of the 9-pin plug socket of DB-9 and the matching plug of the present utility model;

[0025] Figure 3 is a schematic structural diagram of the separated positioning block and the corresponding plug of the present utility model;

[0026] Figure 4 is a schematic structural diagram of the clamped positioning block and the corresponding plug of the present utility model;

[0027] Figure 5 is a schematic structural view of the horizontal telescopic rod of the present utility model;

[0028] Figure 6 is a schematic structural view of the lifting column of the present utility model.

[0029] Reference numerals in the figure: 1 - support plate, 2 - housing, 3 - joint, 4 - positioning block, 5 - plug, 6 - horizontal telescopic rod, 7 - lifting column, 31 - needle, 41 - card slot, 61 - cylindrical barrel, 62 - sliding rod, 63 - circular limiting plate, 71 - sleeve, 72 - movable rod, 73 - spring button, 74 - lock hole. Specific embodiments

[0030] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model, that is, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings herein is not intended to limit the scope of the claimed present utility model, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0032] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0033] The features and performance of the present utility model will be further described in detail below with reference to the embodiments.

[0034] Embodiment 1

[0035] AsFigures 1-4 As described above, the RS485 communication remote communication control module provided by the preferred embodiment of the present utility model includes an RS485 interface. The RS485 interface includes a 9-pin plug socket of DB-9. The plug socket includes a support plate 1, a housing 2 with jacks, and a connector 3 installed inside the jacks of the housing 2. The housing 2 is installed on one side surface of the support plate 1. There are 9 pins 31 on the connector 3. A positioning block 4 is arranged in front of the jacks of the housing 2. A card slot 41 is opened at the bottom of the positioning block 4. The card slot 41 matches the shape of the plug 5 inserted into the housing 2 and connected to the connector 3. The bottom surface of the card slot 41 is completely open. The card slot 41 matches the shape of the upper half of the plug 5 and the upper half of the plug 5 is clamped in the card slot 41. The width of the card slot 41 is smaller than the width of the corresponding part of the plug 5. The card slot 41 is detachably connected to the upper half of the plug 5. A horizontally placed horizontal telescopic rod 6 is installed on the top surface of the positioning block 4. The movable end of the horizontal telescopic rod 6 is fixedly connected to the top surface of the positioning block 4. The fixed end of the horizontal telescopic rod 6 is installed on a vertically placed lifting column 7. The movable end of the lifting column 7 is fixedly connected to the fixed end of the horizontal telescopic rod 6. The fixed end of the lifting column 7 is installed on the top surface of the housing 2.

[0036] When the lifting column 7 sinks to the lowest position, the jacks on the plug 5 clamped inside the card slot 41 are aligned with the pins 31 on the connector 3 one by one, and the central axes of the aligned jacks and pins 31 coincide.

[0037] The horizontal telescopic rod 6 and the lifting column 7 are fixedly connected by bolts.

[0038] The positioning block 4 is an elastic rubber block.

[0039] In the present utility model, the positioning block is used to clamp the plug, and the horizontal telescopic rod and the lifting column are the connection structures between the positioning block and the housing, realizing the vertical and horizontal movement of the positioning block; in the initial state, the lifting column sinks to the shortest, and the upper half of the plug is clamped into the card slot of the positioning block, and the clamping direction can be from bottom to top or horizontally pushed in. When the upper half of the plug is clamped into the card slot, the side surface of the plug with jacks is located outside the card slot; then, the positioning block is pushed towards the direction of the connector, the horizontal telescopic rod shortens towards the direction of the connector, and the positioning block drives the plug to move towards the connector until the pins on the connector are inserted into the jacks on the plug one by one. At this time, only part of the pins are inserted into the jacks. When the positioning block is blocked by the housing and cannot move forward, the lifting column is operated to make the movable end of the lifting column move upward. During the upward movement of the movable end of the lifting column, the positioning block can be pulled up, separating the positioning block from the plug. Then, by continuing to push the plug towards the direction of the connector, the pins on the connector can be completely inserted into the corresponding jacks, accurately completing the insertion of the 9-pin plug socket of DB-9.

[0040] The lifting column and the horizontal telescopic rod in the present utility model can adopt existing telescopic structures, such as selfie sticks, telescopic clothes drying poles, telescopic mop poles, etc. Due to limited installation space in the present utility model, a mechanical telescopic structure is generally adopted, and an electric telescopic structure is not adopted.

[0041] Embodiment 2

[0042] As Figure 5 shown, on the basis of Embodiment 1, the horizontal telescopic rod 6 in this embodiment includes a cylindrical tube 61 with a hollow interior. One end of the cylindrical tube 61 is provided with a through hole for inserting the sliding rod 62. A part of the sliding rod 62 enters the interior of the cylindrical tube 61 through the through hole. The sliding rod 62 is coaxial with the cylindrical tube 61 and is slidably connected. The inner diameter of the cylindrical tube 61 is larger than the diameter of the sliding rod 62. A circular limiting plate 63 that coincides with the central axis of the sliding rod 62 is installed outside the sliding rod 62. The circular limiting plate 63 is located inside the cylindrical tube 61 and the outer diameter of the circular limiting plate 63 is larger than the diameter of the through hole on the end face of the cylindrical tube 61. The circular limiting plate 63 is slidably connected with the cylindrical tube 61; one end of the sliding rod 62 located outside the cylindrical tube 61 is fixedly connected to the top surface of the positioning block 4, and the end face of the cylindrical tube 61 opposite to the through hole is fixedly connected to the movable end of the lifting column 7. The outer diameter of the circular limiting plate 63 is equal to the inner diameter of the cylindrical tube 61 and the circular limiting plate 63 is slidably connected inside the cylindrical tube 61.

[0043] This embodiment is a preferred structure of the horizontal telescopic rod. In the present utility model, the cylindrical tube and the sliding rod are the main parts of the horizontal telescopic rod. The sliding rod reciprocates axially inside the cylindrical tube. The sliding rod is fixedly connected to the positioning block. The sliding rod can drive the positioning block to make a linear reciprocating motion by making a linear reciprocating motion inside the cylindrical tube. The operation is simple and the equipment maintenance cost is low; the circular limiting plate outside the sliding rod is used to prevent the sliding rod from being completely pulled out of the cylindrical tube and separating the sliding rod from the cylindrical tube.

[0044] Embodiment 3

[0045] As Figure 6As shown in the figure, on the basis of Embodiment 1, the lifting column 7 in this embodiment includes a vertically placed sleeve 71. An active rod 72 that coincides with the central axis of the sleeve 71 is inserted into the interior of the sleeve 71. The active rod 72 is slidably connected to the sleeve 71. A spring button 73 is provided on the tube wall of the active rod 72. Two lock holes 74 arranged sequentially along the axial direction of the sleeve 71 are provided on the tube wall of the sleeve 71. The lock holes 74 are through holes that match the shape of the spring button 73 and into which the spring button 73 can pop. The upper end of the active rod 72 is fixedly connected to the fixed end of the horizontal telescopic rod 6. The lower end of the sleeve 71 is installed on the top surface of the housing 2; when the active rod 72 slides until the spring button 73 pops into the lowermost lock hole 74, the jacks on the plug 5 that are snapped into the card slot 41 are aligned one by one with the pins 31 on the connector 3, and the central axes of the mutually aligned jacks and pins 31 coincide.

[0046] This embodiment is a preferred structure of the lifting column. In the present utility model, the sleeve and the active rod are the main structures of the lifting column. The up and down movement of the active rod in the sleeve drives the up and down movement of the positioning block. The active rod and the sleeve are locked tightly through a matching spring button and lock hole. Pressing the spring button down can pull the active rod. When the active rod moves to the current position, the spring button will pop into the corresponding lock hole for locking, and the operation is simple; the present utility model is provided with two lock holes. When the spring button is snapped into the upper lock hole, the positioning block is completely separated from the plug; when the spring button is snapped into the lower lock hole, the card slot on the positioning block is aligned with the connector for plugging the plug into the connector.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any modifications, equivalent replacements, and improvements made by any person skilled in the art within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. RS485 communication remote communication control module, including an RS485 interface, the RS485 interface includes a 9-pin plug socket of DB-9, the plug socket includes a support plate (1), a housing (2) with jacks, and a connector (3) installed inside the jacks of the housing (2), the housing (2) is installed on one side surface of the support plate (1), the connector (3) is provided with 9 pins (31), and it is characterized in that: A positioning block (4) is provided in front of the jack of the outer shell (2). A clamping groove (41) is formed at the bottom of the positioning block (4). The shape of the clamping groove (41) matches that of the plug (5) inserted into the inner part of the outer shell (2) and connected to the connector (3). The bottom surface of the clamping groove (41) is completely open. The shape of the clamping groove (41) matches the upper half of the plug (5) and the upper half of the plug (5) is clamped in the clamping groove (41). The width of the clamping groove (41) is smaller than the width of the corresponding part of the plug (5). The clamping groove (41) is detachably connected to the upper half of the plug (5). A horizontally placed horizontal telescopic rod (6) is installed on the top surface of the positioning block (4). The movable end of the horizontal telescopic rod (6) is fixedly connected to the top surface of the positioning block (4). The fixed end of the horizontal telescopic rod (6) is installed on a vertically placed lifting column (7). The movable end of the lifting column (7) is fixedly connected to the fixed end of the horizontal telescopic rod (6). The fixed end of the lifting column (7) is installed on the top surface of the outer shell (2). When the lifting column (7) sinks to the lowest position, the jacks on the plug (5) clamped inside the clamping groove (41) are aligned with the pins (31) on the connector (3) one by one, and the central axes of the aligned jacks and pins (31) coincide.

2. The RS485 communication remote communication control module according to claim 1, wherein: The horizontal telescopic rod (6) includes a cylindrical tube (61) with a hollow interior. A through hole for inserting a sliding rod (62) is formed at one end of the cylindrical tube (61). A part of the sliding rod (62) enters the interior of the cylindrical tube (61) through the through hole. The sliding rod (62) is coaxial with and slidably connected to the cylindrical tube (61). The inner diameter of the cylindrical tube (61) is larger than the diameter of the sliding rod (62). A circular limiting plate (63) coaxial with the central axis of the sliding rod (62) is installed outside the sliding rod (62). The circular limiting plate (63) is located inside the cylindrical tube (61) and the outer diameter of the circular limiting plate (63) is larger than the diameter of the through hole on the end face of the cylindrical tube (61). The circular limiting plate (63) is slidably connected to the cylindrical tube (61). The end of the sliding rod (62) located outside the cylindrical tube (61) is fixedly connected to the top surface of the positioning block (4). The end face of the cylindrical tube (61) opposite to the through hole is fixedly connected to the movable end of the lifting column (7).

3. The RS485 communication remote communication control module according to claim 1, characterized in that: The lifting column (7) includes a vertically placed sleeve (71). An active rod (72) that coincides with the central axis of the sleeve (71) is inserted inside the sleeve (71). The active rod (72) is slidably connected to the sleeve (71). A spring button (73) is provided on the tube wall of the active rod (72). Two locking holes (74) arranged in sequence along the axial direction of the sleeve (71) are provided on the tube wall of the sleeve (71). The locking holes (74) are through holes that match the shape of the spring button (73) and into which the spring button (73) can pop in. The upper end of the active rod (72) is fixedly connected to the fixed end of the horizontal telescopic rod (6). The lower end of the sleeve (71) is installed on the top surface of the housing (2); when the active rod (72) slides until the spring button (73) pops into the lowermost locking hole (74), the jacks on the plug (5) inserted into the card slot (41) are aligned one by one with the needles (31) on the connector (3), and the central axes of the aligned jacks and needles (31) coincide.

4. The RS485 communication remote communication control module according to claim 1, characterized in that: The horizontal telescopic rod (6) and the lifting column (7) are fixedly connected by bolts.

5. The RS485 communication remote communication control module according to claim 1, wherein: The positioning block (4) is an elastic rubber block.

6. The RS485 communication remote communication control module according to claim 2, wherein: The outer diameter of the circular limiting plate (63) is equal to the inner diameter of the cylindrical barrel (61), and the circular limiting plate (63) is slidably connected inside the cylindrical barrel (61).

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