Dual-power change-over switch

Abstract

The utility model provides a dual-power-supply change-over switch, which comprises a common power supply input end, a standby power supply input end, a power supply output end, a common three-phase voltage sampling circuit, a standby C-phase voltage sampling circuit and a controller, a-phase, B-phase, C-phase and N-phase sampling terminals of the common three-phase voltage sampling circuit are respectively connected with A-phase, B-phase, C-phase and N-phase input terminals of the common power supply input end, and C-phase and N-phase sampling terminals of the standby C-phase voltage sampling circuit are respectively connected with C-phase and N-phase input terminals of the standby power supply input end. An A-phase output terminal, a B-phase output terminal and a C-phase output terminal of the common three-phase voltage sampling circuit and a C-phase output terminal of the standby C-phase voltage sampling circuit are connected with the controller. An oil engine is adopted as a standby power supply for a base station machine room, and a standby C-phase voltage sampling circuit is arranged; and the standby power generation equipment is switched in after being started, and the standby power generation equipment is switched off after the mains supply recovers power supply.

Description

Technical Field

[0001] This utility model relates to the field of telecommunications power control technology, specifically to a dual power supply switching switch. Background Technology

[0002] In the telecommunications sector, numerous base station equipment rooms have been constructed to ensure normal communication. The equipment within these rooms primarily uses mains power and is equipped with batteries to provide power for a period after a mains power outage. To ensure continued operation even after a prolonged mains power outage, the base station equipment room reports the outage to the base station monitoring center. The monitoring center then dispatches maintenance personnel to the affected equipment room, starts a mobile generator, and connects it to the base station equipment room's power system, allowing the generator to serve as a backup power source. However, if the mains power is restored and the generator is not switched off promptly, it can lead to "extra power generation," wasting resources and potentially disrupting grid stability by allowing the generator's output to be fed back into the grid. Therefore, designing a dedicated, reliable mechanical dual-power transfer switch for the base station equipment room is crucial for automatically switching to the backup generator when the mains power is interrupted and automatically disconnecting it from the grid when the mains power is restored. Utility Model Content

[0003] To solve at least one of the above technical problems, this utility model provides a dual power supply switching switch.

[0004] A dual-power transfer switch includes a primary power input terminal, a backup power input terminal, and a power output terminal. It also includes a primary three-phase voltage sampling circuit, a backup C-phase voltage sampling circuit, and a controller. The A-phase, B-phase, C-phase, and N-phase sampling terminals of the primary three-phase voltage sampling circuit are respectively connected to the A-phase, B-phase, C-phase, and N-phase input terminals of the primary power input terminal. The C-phase and N-phase sampling terminals of the backup C-phase voltage sampling circuit are respectively connected to the C-phase and N-phase input terminals of the backup power input terminal. The A-phase, B-phase, and C-phase output terminals of the primary three-phase voltage sampling circuit and the C-phase output terminal of the backup C-phase voltage sampling circuit are all connected to the controller.

[0005] Preferably, the dual power supply switch further includes a motor and a motor control position sampling circuit. The input terminal of the motor control position sampling circuit is connected to the motor to collect data on whether the motor is in a forward-stopping or reverse-stopping state, and the output terminal is connected to the controller.

[0006] In any of the above embodiments, the dual power supply switch further includes a motor control circuit, which is provided with a delay signal input terminal connected to the controller and a delay signal output terminal connected to the motor.

[0007] In any of the above embodiments, the dual power supply switch further includes a motor power supply circuit. The motor power supply circuit includes a backup power supply connection terminal and a normal power supply connection terminal. The backup power supply connection terminal is connected to the C-phase and N-phase input terminals of the backup power supply input terminal, and the normal power supply connection terminal is connected to the A-phase, B-phase, C-phase, and N-phase input terminals of the normal power supply input terminal. The output terminal of the motor power supply circuit is connected to the motor.

[0008] In any of the above embodiments, the dual power supply switch further includes a manual / automatic switch and a manual / automatic switch position sampling circuit, wherein the input terminal of the manual / automatic switch position sampling circuit is connected to the manual / automatic switch, and the output terminal is connected to the controller.

[0009] In any of the above embodiments, the dual power supply switching switch further includes a backup power supply shutdown signal output circuit, the input of which is connected to the controller and the output of which is connected to the backup power supply.

[0010] In any of the above embodiments, the dual power supply switching switch further includes an RS485 serial communication circuit, the input of which is connected to the controller, and the output of which is used to connect to external devices.

[0011] In any of the above embodiments, the dual power supply switch further includes a wireless communication circuit, the input of which is connected to the controller, and its output is used to connect to an external device.

[0012] In a preferred embodiment of any of the above schemes, the dual power supply switch further includes a first power supply circuit, a second power supply circuit, and a third power supply circuit. The input terminal of the first power supply circuit is connected to the input terminal of the main power supply, the input terminal of the second power supply circuit is connected to the input terminal of the backup power supply, and the input terminal of the third power supply circuit is connected to an external 48V DC power supply. The output terminals of the first, second, and third power supply circuits are all connected to the voltage input terminals of the three-phase voltage sampling circuit, the backup C-phase voltage sampling circuit, the controller, the motor control position sampling circuit, the motor control circuit, the manual / automatic switch position sampling circuit, the backup power supply stop signal output circuit, the RS485 serial communication circuit, and the wireless communication circuit, providing them with operating voltage.

[0013] In any of the above embodiments, the dual power supply switch includes a base plate and a housing connected to the base plate, wherein a first mounting cavity, a second mounting cavity, a third mounting cavity, and a fourth mounting cavity are formed between the housing and the base plate in a sequence from left to right.

[0014] In any of the above embodiments, a common power circuit breaker is installed in the first mounting cavity, the common power input terminal is provided on the upper side of the housing corresponding to the position of the first mounting cavity, and the backup power input terminal is provided on the lower side.

[0015] In any of the above solutions, the commonly used power input terminal adopts a pressure plate method, and the backup power input terminal adopts a circuit breaker method.

[0016] In any of the above embodiments, the motor and the first PCB circuit board are installed in the second mounting cavity, and the first PCB circuit board is provided with the manual / automatic switch position sampling circuit and the LED indicator control circuit.

[0017] In any of the above embodiments, a plurality of through holes are provided on the housing corresponding to the position of the second mounting cavity. The manual / automatic switch passes through one of the through holes and is connected to the manual / automatic switch position sampling circuit. The standby / standby closing knob passes through another through hole and is connected to the motor. LED indicator lights are provided at the other through hole positions. The LED indicator lights are connected to the output terminal of the LED indicator light control circuit, and the input terminal of the LED indicator light control circuit is connected to the controller.

[0018] In any of the above embodiments, the backup power circuit breaker is installed in the third mounting cavity, and the power output terminal is provided on the lower side of the housing corresponding to the position of the third mounting cavity.

[0019] In any of the above embodiments, a preferred embodiment is that a second PCB circuit board is installed in the fourth mounting cavity, and the second PCB circuit board is provided with the three-phase voltage sampling circuit, the backup C-phase voltage sampling circuit, the controller, the motor control position sampling circuit, the motor control circuit, the backup power supply shutdown signal output circuit, the RS485 serial communication circuit, and the wireless communication circuit. A communication terminal connected to the RS485 serial communication circuit is provided on the housing corresponding to the position of the fourth mounting cavity.

[0020] The dual power supply switch of this utility model has the following beneficial effects:

[0021] 1. Specifically designed for base station equipment room power supply systems, especially for base station equipment rooms using generators as backup power supplies, with a backup C-phase voltage sampling circuit;

[0022] 2. It can reliably switch to the standby power generation equipment after the mains power is disconnected and the standby power generation equipment starts, and automatically disconnect from the grid connection of the standby power generation equipment after the mains power is restored;

[0023] 3. In view of the characteristics of the power supply system of the base station equipment room, a single power output terminal is set up. Compared with most dual power transfer switches currently on the market that have dual power output ports, this saves the workload of connecting the two power output ports in parallel and then connecting the load, and reduces the complexity of construction.

[0024] 4. The main power input terminal and the backup power output terminal are respectively located on the upper and lower sides of the housing. At the same time, the power output terminal and the power input terminal are respectively located on both sides of the main / backup closing knob. Compared with some dual power transfer switches currently on the market that arrange them side by side, it is easier to connect the main power, backup power and power output.

[0025] 5. The structure is reasonable and the performance is reliable. Attached Figure Description

[0026] Figure 1 This is a partial circuit diagram of a preferred embodiment of the dual power supply switching switch according to the present invention.

[0027] Figure 2 For example, the dual power supply switching switch according to this utility model Figure 1 The schematic diagram of the commonly used three-phase voltage sampling circuit and the spare C-phase voltage sampling circuit in the embodiment shown is shown.

[0028] Figure 3 For example, the dual power supply switching switch according to this utility model Figure 1 A schematic diagram of the controller wiring structure in the embodiment shown.

[0029] Figure 4 For example, the dual power supply switching switch according to this utility model Figure 1 A schematic diagram of the motor control position sampling circuit in the embodiment shown.

[0030] Figure 5 For example, the dual power supply switching switch according to this utility model Figure 1 The schematic diagram of the motor control circuit in the embodiment shown is as follows.

[0031] Figure 6 For example, the dual power supply switching switch according to this utility model Figure 1 The schematic diagram of the motor power supply circuit in the embodiment shown is as follows.

[0032] Figure 7 For example, the dual power supply switching switch according to this utility model Figure 1 The schematic diagram shows the structure of the manual / automatic switch position sampling circuit and the LED indicator control circuit in the embodiment shown.

[0033] Figure 8 For example, the dual power supply switching switch according to this utility model Figure 1 A schematic diagram of the backup power supply shutdown signal output circuit in the embodiment shown.

[0034] Figure 9 For example, the dual power supply switching switch according to this utility model Figure 1 The schematic diagram of the RS485 serial communication circuit in the embodiment shown is shown.

[0035] Figure 10 For example, the dual power supply switching switch according to this utility model Figure 1 A schematic diagram of the first switch power supply circuit in the illustrated embodiment.

[0036] Figure 11 For example, the dual power supply switching switch according to this utility model Figure 1 A schematic diagram of the second switch power supply circuit in the embodiment shown.

[0037] Figure 12 For example, the dual power supply switching switch according to this utility model Figure 1 A schematic diagram of the third switch power supply circuit in the embodiment shown.

[0038] Figure 13 For example, the dual power supply switching switch according to this utility model Figure 1 The external structure diagram of the embodiment shown is shown. Detailed Implementation

[0039] To better understand this utility model, the following detailed description is provided in conjunction with specific embodiments.

[0040] Example 1

[0041] like Figure 1 As shown, a dual power supply transfer switch includes a main power input terminal, a backup power input terminal, and a power output terminal. Figure 1 (Not shown in the image) It also includes a standard three-phase voltage sampling circuit, a backup C-phase voltage sampling circuit, and a controller. The A-phase, B-phase, C-phase, and N-phase sampling terminals of the standard three-phase voltage sampling circuit are respectively connected to the A-phase, B-phase, C-phase, and N-phase input terminals of the standard power input terminal. The C-phase and N-phase sampling terminals of the backup C-phase voltage sampling circuit are respectively connected to the C-phase and N-phase input terminals of the backup power input terminal. The A-phase, B-phase, and C-phase output terminals of the standard three-phase voltage sampling circuit and the C-phase output terminal of the backup C-phase voltage sampling circuit are all connected to the controller.

[0042] Figure 2The diagram illustrates one embodiment of the commonly used three-phase voltage sampling circuit and the backup C-phase voltage sampling circuit. The commonly used three-phase voltage sampling circuit includes voltage divider resistors, voltage transformers, and sampling resistors, used to collect the voltages of phases A, B, and C of the commonly used power supply, respectively. The backup C-phase voltage sampling circuit also includes voltage divider resistors, voltage transformers, and sampling resistors, used to collect the voltage value of phase C of the backup power supply.

[0043] Figure 3 The diagram shows a wiring structure of one embodiment of the controller. In this embodiment, the controller model is HC32L130J8TA. The A-phase, B-phase, and C-phase output terminals of the commonly used three-phase voltage sampling circuit are connected to the PB01, PA07, and PB00 pins of the controller, respectively, and the C-phase output terminal of the spare C-phase voltage sampling circuit is connected to the PA06 pin of the controller.

[0044] In this preferred embodiment, the dual power supply switch further includes a motor and a motor control position sampling circuit. The input terminal of the motor control position sampling circuit is connected to the motor to collect data on whether the motor is in a forward-stop or reverse-stop state, and the output terminal is connected to the controller. One embodiment of the motor control position sampling circuit is as follows: Figure 4 As shown, the input terminal of the motor control position sampling circuit is connected to the motor. Figure 4 When S1 is closed, it indicates that the motor is in a forward-stop state (stopping after forward rotation), the mains power circuit breaker is closed, and the mains power supply is activated. When S2 is closed, it indicates that the motor is in a reverse-stop state (stopping after reverse rotation), the backup power circuit breaker is closed, and the backup power supply is activated. The output of the motor control position sampling circuit is connected to the PB09 and PA09 pins of the controller, respectively, to output a low-level signal to the controller when the mains power circuit breaker and the backup power circuit breaker are closed, thereby determining whether the motor is on the mains power supply side or the backup power supply side.

[0045] In this embodiment, preferably, the dual power supply switch further includes a motor control circuit. The motor control circuit has a delay signal input terminal connected to the controller and a delay signal output terminal connected to the motor. One embodiment of the motor control circuit is as follows: Figure 5 As shown, its delayed signal input terminal is connected to the PB10, PB02, PA02, PA01, and PA00 pins of the controller, respectively. After receiving the motor action signal from the controller, it delays for a period of time, and then its delayed signal output terminal outputs the action signal to the motor.

[0046] In this preferred embodiment, the dual power supply switch further includes a motor power supply circuit. The motor power supply circuit includes a backup power supply connection terminal and a primary power supply connection terminal. The backup power supply connection terminal is connected to the C-phase and N-phase input terminals of the backup power supply input terminal, and the primary power supply connection terminal is connected to the A-phase, B-phase, C-phase, and N-phase input terminals of the primary power supply input terminal. The output terminal of the motor power supply circuit is connected to the motor. One embodiment of the motor power supply circuit is as follows: Figure 6 As shown, when the main power supply is powered, the motor is powered by any one of phases A, B, and C of the main power supply. When the main power supply is de-energized and the backup power supply is powered, the motor is powered by phase C of the backup power supply.

[0047] In this embodiment, preferably, the dual power supply switch further includes a manual / automatic switch and a manual / automatic switch position sampling circuit, wherein the input terminal of the manual / automatic switch position sampling circuit is connected to the manual / automatic switch, and the output terminal is connected to the controller.

[0048] In this embodiment, preferably, the dual power supply switching switch further includes a backup power supply shutdown signal output circuit, whose input terminal is connected to the controller and whose output terminal is connected to the backup power supply. One embodiment of the backup power supply shutdown signal output circuit is as follows: Figure 8 The input terminal is connected to the PB11 pin of the controller.

[0049] In this embodiment, preferably, the dual power supply switch further includes an RS485 serial communication circuit, whose input terminal is connected to the controller, and whose output terminal is used to connect to an external device. One embodiment of the RS485 serial communication circuit is as follows: Figure 9 As shown, it receives the status of the dual power supply switching switch (including the status of the normal power supply voltage, the status of the backup power supply voltage, the manual / automatic status, the status of the normal switch, the status of the backup switch, the backup power supply shutdown signal, etc.) through the PA03, PA04 and PA05 pins of the controller and sends it to external devices (such as the gateway for communication connection of the base station monitoring center).

[0050] In this embodiment, preferably, the dual power supply switch further includes a wireless communication circuit. The input terminal of the wireless communication circuit is connected to the controller, and its output terminal is used to connect to an external device (such as a gateway for communication connection with a base station monitoring center).

[0051] In this preferred embodiment, the dual power supply switch further includes a first power supply circuit, a second power supply circuit, and a third power supply circuit. The input terminal of the first power supply circuit is connected to the main power input terminal, the input terminal of the second power supply circuit is connected to the backup power input terminal, and the input terminal of the third power supply circuit is connected to an external 48V DC power supply. The output terminals of the first, second, and third power supply circuits are all connected to the voltage input terminals of the three-phase voltage sampling circuit, the backup C-phase voltage sampling circuit, the controller, the motor control position sampling circuit, the motor control circuit, the manual / automatic switch position sampling circuit, the backup power stop signal output circuit, the RS485 serial communication circuit, and the wireless communication circuit, providing them with operating voltage. One embodiment of the first power supply circuit is as follows: Figure 10 As shown, it provides the operating voltage to the dual power supply switch through any one of phases A, B, or C of the common power supply; one embodiment of the second switch power supply circuit is as follows: Figure 11 As shown, it provides the operating voltage to the dual power supply switching switch through the C phase of the backup power supply; one embodiment of the third switch power supply circuit is as follows: Figure 12 As shown, the dual power supply switch is supplied with operating voltage via an external 48V DC power supply. It should be noted that... Figure 1 The connection relationships between the first switch power supply circuit, the second switch power supply circuit, the third switch power supply circuit and other circuits are omitted.

[0052] In this embodiment, it is preferred that, as Figure 13 As shown, the dual power supply switch includes a base plate 2 and a housing 1 connected to the base plate 2. A first mounting cavity, a second mounting cavity, a third mounting cavity, and a fourth mounting cavity are formed between the housing 1 and the base plate 2, arranged sequentially from left to right.

[0053] A common power circuit breaker is installed inside the first mounting cavity. The common power input terminal 5 is located on the upper side of the housing corresponding to the position of the first mounting cavity, and the backup power input terminal 4 is located on the lower side. The common power input terminal 5 is a pressure plate type, and the backup power input terminal 4 is a circuit breaker type.

[0054] It should be noted that, under normal circumstances, the backup power supply for a base station equipment room is a portable generator. When the monitoring center detects a power outage in a base station equipment room, it will dispatch maintenance personnel with a portable generator to the base station equipment room where the power is out. The portable generator will be connected to the backup power input terminal 4 of the dual power transfer switch. When the power is restored, the maintenance personnel will return to the base station equipment room to disconnect the portable generator from the backup power input terminal 4 of the dual power transfer switch and remove the portable generator from the base station equipment room. Therefore, in order to more conveniently connect and disconnect the portable generator from the backup power input terminal 4, the backup power input terminal 4 is a circuit breaker.

[0055] The motor and the first PCB circuit board are installed in the second mounting cavity. The first PCB circuit board is provided with the manual / automatic switch position sampling circuit and the LED indicator control circuit. Several through holes are provided on the housing corresponding to the position of the second mounting cavity. The manual / automatic switch 6 passes through one through hole and is connected to the manual / automatic switch position sampling circuit. The standby / normal closing knob 8 passes through another through hole and is connected to the motor. LED indicator lights 7 are provided at the other through hole positions. The LED indicator lights 7 are connected to the output terminal of the LED indicator control circuit. The input terminal of the LED indicator control circuit is connected to the controller. Figure 7 The diagram shows a schematic of one embodiment of the manual / automatic switch position sampling circuit and the LED indicator control circuit. The output of the manual / automatic switch position sampling circuit is connected to the PB08 pin of the controller, and the input of the LED indicator control circuit is connected to the PA12, PA11, PA15, PB03, PB04, and PB05 pins of the controller, respectively, to control the LED indicator to indicate the status of the normal power supply voltage, the backup power supply voltage, the normal switch status, and the backup switch status.

[0056] The backup power circuit breaker is installed in the third mounting cavity, and the power output terminal 3 is provided on the lower side of the housing corresponding to the position of the third mounting cavity.

[0057] The fourth mounting cavity houses a second PCB circuit board, which is equipped with the three-phase voltage sampling circuit, the backup C-phase voltage sampling circuit, the controller, the motor control position sampling circuit, the motor control circuit, the backup power supply shutdown signal output circuit, the RS485 serial communication circuit, and the wireless communication circuit. A communication terminal connected to the RS485 serial communication circuit is provided on the housing corresponding to the position of the fourth mounting cavity.

[0058] It should be noted that the technical solutions of this application involve improvements in hardware and not software. For parts without specified models, any commonly used components in the prior art can be selected without model limitation. For components with specified models in the embodiments, they are only used to illustrate the technical solutions of this application in detail. It should be understood that the technical solutions to be protected by this utility model are not limited to these models, and there are many alternatives to these components in the prior art.

[0059] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the foregoing embodiments have described this utility model in detail, those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. However, these substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

Claims

1. A dual-power transfer switch, comprising a primary power input terminal, a backup power input terminal, and a power output terminal, characterized in that: It also includes a standard three-phase voltage sampling circuit, a backup C-phase voltage sampling circuit, and a controller. The A-phase, B-phase, C-phase, and N-phase sampling terminals of the standard three-phase voltage sampling circuit are respectively connected to the A-phase, B-phase, C-phase, and N-phase input terminals of the standard power input terminal. The C-phase and N-phase sampling terminals of the backup C-phase voltage sampling circuit are respectively connected to the C-phase and N-phase input terminals of the backup power input terminal. The A-phase, B-phase, and C-phase output terminals of the standard three-phase voltage sampling circuit and the C-phase output terminal of the backup C-phase voltage sampling circuit are all connected to the controller.

2. The dual power supply switching switch as described in claim 1, characterized in that: It also includes a motor and a motor control position sampling circuit. The input terminal of the motor control position sampling circuit is connected to the motor to collect data on whether the motor is in a forward-stopping or reverse-stopping state, and the output terminal is connected to the controller.

3. The dual power supply switching switch as described in claim 2, characterized in that: It also includes a motor control circuit, which is provided with a delay signal input terminal connected to the controller and a delay signal output terminal connected to the motor.

4. The dual power supply switching switch as described in claim 3, characterized in that: It also includes a motor power supply circuit, which includes a backup power connection terminal and a normal power connection terminal. The backup power connection terminal is connected to the C-phase and N-phase input terminals of the backup power input terminal, and the normal power connection terminal is connected to the A-phase, B-phase, C-phase, and N-phase input terminals of the normal power input terminal. The output terminal of the motor power supply circuit is connected to the motor.

5. The dual power supply switching switch as described in claim 4, characterized in that: It also includes a manual / automatic switch and a manual / automatic switch position sampling circuit, wherein the input terminal of the manual / automatic switch position sampling circuit is connected to the manual / automatic switch, and the output terminal is connected to the controller.

6. The dual power supply switching switch as described in claim 5, characterized in that: It also includes a backup power supply shutdown signal output circuit, whose input is connected to the controller and whose output is connected to the backup power supply.

7. The dual power supply transfer switch as described in claim 6, characterized in that: It also includes an RS485 serial communication circuit, whose input is connected to the controller and whose output is used to connect to external devices; it also includes a wireless communication circuit, whose input is connected to the controller and whose output is used to connect to external devices.

8. The dual power supply switching switch as described in claim 7, characterized in that: It also includes a first switch power supply circuit, a second switch power supply circuit, and a third switch power supply circuit. The input terminal of the first switch power supply circuit is connected to the main power supply input terminal, the input terminal of the second switch power supply circuit is connected to the backup power supply input terminal, and the input terminal of the third switch power supply circuit is connected to an external 48V DC power supply. The output terminals of the first, second, and third switch power supply circuits are all connected to the voltage input terminals of the three-phase voltage sampling circuit, the backup C-phase voltage sampling circuit, the controller, the motor control position sampling circuit, the motor control circuit, the manual / automatic switch position sampling circuit, the backup power supply stop signal output circuit, the RS485 serial communication circuit, and the wireless communication circuit to provide them with operating voltage.

9. The dual power supply switching switch as described in claim 8, characterized in that: It includes a base plate and a housing connected to the base plate, wherein a first mounting cavity, a second mounting cavity, a third mounting cavity and a fourth mounting cavity are formed between the housing and the base plate in a sequence from left to right.

10. The dual power supply switching switch as described in claim 9, characterized in that: The first mounting cavity houses a common power circuit breaker, with the common power input terminal located on the upper side of the housing corresponding to the position of the first mounting cavity, and the backup power input terminal located on the lower side. The second mounting cavity houses the motor and a first PCB circuit board, with the manual / automatic switch position sampling circuit and LED indicator control circuit mounted on the first PCB circuit board. The third mounting cavity houses a backup power circuit breaker, with the power output terminal located on the lower side of the housing corresponding to the position of the third mounting cavity. The fourth mounting cavity houses a second PCB circuit board, with the three-phase voltage sampling circuit, the backup C-phase voltage sampling circuit, the controller, the motor control position sampling circuit, the motor control circuit, the backup power stop signal output circuit, the RS485 serial communication circuit, and the wireless communication circuit mounted on the second PCB circuit board. A communication terminal connected to the RS485 serial communication circuit is located on the housing corresponding to the position of the fourth mounting cavity.

Images