Multifunctional communication control module based on RS485 bus

Abstract

The utility model provides a multifunctional communication control module based on an RS485 bus, which comprises an MCU controller, a bus side communication interface circuit, a peripheral communication interface circuit, a control signal output interface circuit and a control signal input interface circuit, and is characterized in that the MCU controller is used for signal processing and control and is connected with an external monitoring computer through the bus side communication interface circuit; receiving parameter setting from the monitoring computer, and returning related data; the bus side communication interface circuit is used for setting a unique address of the MCU controller on an RS485 bus and realizing data communication between the MCU controller and an external monitoring computer; the peripheral communication interface circuit is configured through an external monitoring computer according to requirements so as to be matched with different tested products; the control signal output interface circuit is used for standby, on-off control, output current adjustment and auxiliary control function expansion of the tested product; the control signal input interface circuit collects a related voltage signal output by a tested product and receives a logic level output by the tested product. Therefore, connection of four common communication interfaces of RS232, RS485, CAN FD and I2C can be supported, so that equipment of different models can be tested conveniently.

Description

Technical Field

[0001] This utility model relates to the technical field of multifunctional communication control modules based on RS485 bus, and in particular to a multifunctional communication control module based on RS485 bus. Background Technology

[0002] With the continuous expansion of power supply applications, power converters are rapidly evolving towards digitalization and intelligence. This enables the monitoring and control of the power converter's operating status and technical parameters by the application. Various communication interfaces exist between devices in different application areas, such as RS232, RS485, CAN, and I2C. Devices with different interfaces often cannot communicate directly and require signal conversion through interface converters. As a general-purpose aging test device, it needs to be compatible with as many different types of communication interfaces as possible to improve compatibility and utilization, reducing redundant investment in aging test equipment for users.

[0003] A power supply company typically doesn't produce only a single product. For example, a company might manufacture four types of power supplies: A) server power supplies (I2C communication), B) industrial power supplies (RS485 communication), C) instrument power supplies (RS232 communication), and D) new energy vehicle chargers (CAN communication). They might produce A when there's an order, B when there's an order, or even produce them simultaneously. However, regardless of the power supply product, aging tests are required. If there isn't a device compatible with all four communication interfaces, four different communication interface devices would need to be customized. Even if a customer orders all four, if orders for A are all for a period while orders for B, C, and D are temporarily unavailable, there will be a shortage of A devices, leaving the other three idle and unused. Equipment is a high-value asset; poor compatibility leads to low utilization and excessive investment. Therefore, a bus-type communication converter is needed that can support simultaneous testing of multiple products with the same address code, but there are currently no communication interface converters on the market that support this application.

[0004] Current interface converters on the market have limited functionality, only capable of converting between two specific interfaces, failing to meet complex communication needs. Furthermore, existing interface converters do not support bus architectures, making it impossible for a single computer to simultaneously control dozens or even hundreds of products under test with similar address codes, resulting in shortcomings in feasibility and scalability. Especially in the field of industrial automation control, in addition to high requirements for communication reliability and real-time performance, it is often necessary to provide corresponding control logic signals to control the standby and startup states of the power supply under test, as well as to receive and monitor various status flags of the power supply output. Existing interface converters struggle to meet these requirements. Therefore, in energy-saving aging test systems, the functionality and performance of the interface converter, as a unit directly connected to the power supply under test, directly affect the compatibility of the equipment.

[0005] With the digitalization and intelligentization of power supplies, new power supplies not only require communication interfaces, but may also need various external control signals. For example, server power supplies require two external PS_ON enable control signals; laser power supplies, in addition to similar control signals, also need DA (digital-to-analog) signals that can adjust the output current; some power supplies also return status signals that need to be read and judged by the device. This requires the device to not only support various communications, but also to send various control signals and read various hardware status signals returned by the product under test. However, there is a significant lack of communication interface converters on the market that can simultaneously meet these application requirements.

[0006] Therefore, it is necessary to propose a multi-functional communication control module based on RS485 bus to support the connection of four commonly used communication interfaces: RS232, RS485, CAN FD, and I2C, so as to facilitate testing of different models of equipment. Utility Model Content

[0007] To address the aforementioned issues, this invention proposes a multi-functional communication control module based on the RS485 bus to support connections to four commonly used communication interfaces: RS232, RS485, CAN FD, and I2C, facilitating testing of different device models.

[0008] This utility model is achieved through the following technical solution:

[0009] This utility model proposes a multi-functional communication control module based on RS485 bus, including an MCU controller, a bus-side communication interface circuit, a peripheral communication interface circuit, a control signal output interface circuit, and a control signal input interface circuit. The MCU controller is electrically connected to the bus-side communication interface circuit, the peripheral communication interface circuit, the control signal output interface circuit, and the control signal input interface circuit, respectively.

[0010] The MCU controller is used for signal processing and control, and is connected to an external monitoring computer through the bus-side communication interface circuit to receive parameter settings from the monitoring computer and return relevant data.

[0011] The bus-side communication interface circuit is used to set the unique address of the MCU controller on the RS485 bus, so as to realize data communication between the MCU controller and the external monitoring computer.

[0012] The peripheral communication interface circuit is configured via an external monitoring computer to match different products under test, as required.

[0013] The control signal output interface circuit is used for standby, power on / off control, output current adjustment, and expansion of auxiliary control functions of the product under test.

[0014] The control signal input interface circuit acquires the relevant voltage signals output by the product under test and receives the logic levels output by the product under test.

[0015] Furthermore, the bus-side communication interface circuit includes an RS485 level conversion circuit, an isolation optocoupler, and an address code selection switch. The RS485 level conversion circuit is electrically connected to the isolation optocoupler, and the isolation optocoupler and the address code selection switch are respectively electrically connected to the MCU controller.

[0016] Furthermore, the control signal input interface circuit includes a first analog voltage input interface circuit, a second analog voltage input interface circuit, a first logic signal input interface circuit, and a second logic signal input interface circuit. The first analog voltage input interface circuit, the second analog voltage input interface circuit, the first logic signal input interface circuit, and the second logic signal input interface circuit are electrically connected to the MCU controller. The first analog voltage input interface circuit and the second analog voltage input interface circuit are both used to acquire relevant voltage signals output by the product under test. The first logic signal input interface circuit and the second logic signal input interface circuit are both used to receive the logic level output by the product under test.

[0017] Furthermore, the first analog voltage input interface circuit includes resistors R41, R42, and R43, and capacitor C30. One end of resistor R41 is electrically connected to one end of resistor R42. The other end of resistor R42 is electrically connected to one end of resistor R43 and one end of capacitor C30, and then connected to pin 16 of the MCU controller. The other end of resistor R43 is electrically connected to the other end of capacitor C30 and then grounded.

[0018] Furthermore, the first logic signal input interface circuit includes an electrostatic discharge (ESD) protector TV7, a coupling resistor R55, and a Zener diode Z3. One end of the ESD protector TV7 is grounded, and the other end of the ESD protector TV7 is electrically connected to one end of the coupling resistor R55. The other end of the coupling resistor R55 is electrically connected to one end of the Zener diode Z3 and then connected to pin 39 of the MCU controller. The other end of the Zener diode Z3 is grounded.

[0019] Furthermore, the control signal output interface circuit includes two programmable analog signal circuits, two high-level enable signal circuits, two low-level enable signal circuits, and two switch enable signal circuits. The two programmable analog signal circuits, the two high-level enable signal circuits, the two low-level enable signal circuits, and the two switch enable signal circuits are all electrically connected to the MCU controller.

[0020] Furthermore, the programmable analog signal circuit includes an operational amplifier U14A, resistor R3, capacitor R27, resistor R35, resistor R6, resistor R7, resistor R4, and capacitor R28. The first pin of the operational amplifier U14A is electrically connected to one end of resistor R3, one end of resistor R4, and one end of capacitor R28. The second pin of the operational amplifier U14A is electrically connected to the other end of resistor R4, the other end of capacitor R28, and one end of resistor R7. The other end of resistor R7 is grounded. The eighth pin of the operational amplifier U14A is connected to 12V DC and electrically connected to one end of capacitor R27. The other end of capacitor R27 is grounded. The third pin of the operational amplifier U14A is electrically connected to one end of resistor R35 and one end of resistor R6. The other end of resistor R35 is grounded. The fourth pin of the operational amplifier U14A is grounded.

[0021] Furthermore, the high-level enable signal circuit includes transistors Q3 and Q4, and resistor R49. The emitter (E) of transistor Q3 is grounded, the collector (C) of transistor Q3 is electrically connected to the base (B) of transistor Q4, and the collector (C) of transistor Q4 is electrically connected to one end of resistor R49.

[0022] Furthermore, the switch enable signal circuit includes resistor R53, resistor R54, and optical solid-state relay PC1. One end of resistor R53 is electrically connected to one end of resistor R54 and the first pin of optical solid-state relay PC1, and the other end of resistor R54 is electrically connected to the second pin of optical solid-state relay PC1 and then grounded.

[0023] Furthermore, the multi-functional communication control module based on the RS485 bus also includes a power supply, which is electrically connected to the MCU controller.

[0024] The beneficial effects of this utility model are:

[0025] This invention integrates an MCU controller, a bus-side communication interface circuit, a peripheral communication interface circuit, a control signal output interface circuit, and a control signal input interface circuit into one unit. The MCU controller is used for signal processing and control, and connects to an external monitoring computer through the bus-side communication interface circuit to receive parameter settings from the monitoring computer and return relevant data. The bus-side communication interface circuit is used to set a unique address for the MCU controller on the RS485 bus, enabling data communication between the MCU controller and the external monitoring computer. The peripheral communication interface circuit is used to configure the device under test (DUT) according to requirements via the external monitoring computer to match different DUT products. The control signal output interface circuit is used for standby, power on / off control, output current adjustment, and expansion of auxiliary control functions of the DUT product. The control signal input interface circuit collects relevant voltage signals output by the DUT product and receives the logic levels output by the DUT product. This allows the invention to support connections to four commonly used communication interfaces: RS232, RS485, CAN FD, and I2C, facilitating testing of different models of equipment. Attached Figure Description

[0026] Figure 1 This is a functional block diagram of the multi-functional communication control module based on the RS485 bus of this utility model;

[0027] Figure 2 This is a circuit diagram of the control signal input interface circuit of the multifunctional communication control module based on RS485 bus of this utility model.

[0028] Figure 3 This is a circuit diagram of the programmable analog signal circuit of the multi-functional communication control module based on the RS485 bus of this utility model.

[0029] Figure 4 This is a circuit diagram of the high-level enable signal circuit of the multi-functional communication control module based on RS485 bus of this utility model.

[0030] Figure 5 This is a circuit diagram of the low-level enable signal circuit of the multi-functional communication control module based on RS485 bus of this utility model.

[0031] Figure 6 This is a circuit diagram of the switch enable signal circuit of the multi-functional communication control module based on RS485 bus of this utility model.

[0032] Figure 7 This is a circuit diagram of the power supply for the multi-functional communication control module based on the RS485 bus of this utility model.

[0033] The attached figures are labeled as follows:

[0034] MCU controller 1, bus-side communication interface circuit 2, peripheral communication interface circuit 3, control signal output interface circuit 4, control signal input interface circuit 5, power supply 6. Detailed Implementation

[0035] To more clearly and completely illustrate the technical solution of this utility model, the following description, in conjunction with the accompanying drawings, will further explain this utility model.

[0036] Please refer to Figures 1-7 This utility model proposes a multi-functional communication control module based on RS485 bus, including MCU controller 1, bus-side communication interface circuit 2, peripheral communication interface circuit 3, control signal output interface circuit 4, and control signal input interface circuit 5. MCU controller 1 is electrically connected to bus-side communication interface circuit 2, peripheral communication interface circuit 3, control signal output interface circuit 4, and control signal input interface circuit 5 respectively.

[0037] In this embodiment, the MCU controller is used for signal processing and control, and connects to an external monitoring computer via a bus-side communication interface circuit. It receives parameter settings from the monitoring computer and returns relevant data. The bus-side communication interface circuit is used to set a unique address for the MCU controller on the RS485 bus, enabling data communication between the MCU controller and the external monitoring computer. The peripheral communication interface circuit is used to configure the device under test (DUT) according to requirements via the external monitoring computer to match different DUT products. The control signal output interface circuit is used for standby, power on / off control, output current adjustment, and expansion of auxiliary control functions for the DUT product. The control signal input interface circuit acquires relevant voltage signals output by the DUT product and receives the logic levels output by the DUT product. This allows the present invention to support connections to four commonly used communication interfaces: RS232, RS485, CAN FD, and I2C, facilitating testing of different device models.

[0038] In this embodiment, the bus-side communication interface circuit 2 includes an RS485 level conversion circuit, an isolation optocoupler, and an address code selection switch. The RS485 level conversion circuit is electrically connected to the isolation optocoupler, and the isolation optocoupler and the address code selection switch are electrically connected to the MCU controller. The address code selection switch is used to set the unique address of this invention on the RS485 bus to realize data communication between the converter and the external monitoring computer.

[0039] In this embodiment, the control signal input interface circuit 5 includes a first analog voltage input interface circuit, a second analog voltage input interface circuit, a first logic signal input interface circuit, and a second logic signal input interface circuit. These circuits are electrically connected to the MCU controller. The first and second analog voltage input interface circuits are both used to acquire relevant voltage signals output by the product under test. The first and second logic signal input interface circuits are both used to receive the logic level output by the product under test. The input interface circuit includes resistors R41, R42, R43, and capacitor C30. One end of resistor R41 is electrically connected to one end of resistor R42. The other end of resistor R42 is electrically connected to one end of resistor R43 and one end of capacitor C30, and then connected to pin 16 of the MCU controller. The other end of resistor R43 is electrically connected to the other end of capacitor C30 and then grounded. The second analog voltage input interface circuit includes resistors R44, R45, R46, and capacitor C31. One end of resistor R44 is electrically connected to one end of resistor R45. The other end of resistor R45 is electrically connected to one end of resistor R46 and one end of capacitor C31, and then connected to pin 16 of the MCU controller. On pin 17, the other end of resistor R46 is electrically connected to the other end of capacitor C31 and then grounded; the first logic signal input interface circuit includes an electrostatic discharge (ESD) protector TV7, coupling resistor R55, and Zener diode Z3. One end of ESD protector TV7 is grounded, and the other end of ESD protector TV7 is electrically connected to one end of coupling resistor R55. The other end of coupling resistor R55 is electrically connected to one end of Zener diode Z3 and then connected to pin 39 of the MCU controller. The other end of Zener diode Z3 is grounded; the first analog voltage input interface circuit receives input from Vin1, which is divided by resistors R41, R42, and R43, filtered by C30, and then sent to pin 16 of MCU controller U4 for A. A / D conversion; the second analog voltage input interface circuit receives Vin2, which is divided by resistors R44, R45, and R46, filtered by C31, and then sent to pin 17 of the MCU controller U4 for A / D conversion; the first logic signal input interface circuit Logic_IN1 receives the signal from the electrostatic protector TV7, then is limited by coupling resistor R55 and Zener diode Z3, and then sent to pin 39 of the MCU controller U4 for high / low level logic judgment; the second logic signal input interface circuit Logic_IN2 receives the signal from the electrostatic protector TV8, then is limited by coupling resistor R56 and Zener diode Z4, and then sent to pin 40 of the MCU controller U4 for high / low level logic judgment.

[0040] In this embodiment, the control signal output interface circuit 4 includes two programmable analog signal circuits, two high-level enable signal circuits, two low-level enable signal circuits, and two switch enable signal circuits. All three circuits are electrically connected to the MCU controller. The programmable analog signal circuits include an operational amplifier U14A, resistor R3, capacitor R27, resistor R35, resistor R6, resistor R7, resistor R4, and capacitor R28. Pin 1 of the operational amplifier U14A is electrically connected to one end of resistor R3, one end of resistor R4, and one end of capacitor R28, respectively. Pin 2 of the operational amplifier U14A is... Do not connect the other end of resistor R4, the other end of capacitor R28, or one end of resistor R7. The other end of resistor R7 is grounded. Pin 8 of operational amplifier U14A is connected to 12V DC and is electrically connected to one end of capacitor R27. The other end of capacitor R27 is grounded. Pin 3 of operational amplifier U14A is electrically connected to one end of resistor R35 and one end of resistor R6. The other end of resistor R35 is grounded. Pin 4 of operational amplifier U14A is grounded. The high-level enable signal circuit includes transistors Q3 and Q4, and resistor R49. The emitter (E) of transistor Q3 is grounded. The collector (C) of transistor Q3 is electrically connected to the base (B) of transistor Q4. The collector (C) of transistor Q4 is electrically connected to one end of resistor R49. The switch enable signal circuit... The circuit includes resistors R53 and R54, and an optical solid-state relay PC1. One end of resistor R53 is electrically connected to one end of resistor R54 and pin 1 of the optical solid-state relay PC1. The other end of resistor R54 is electrically connected to pin 2 of the optical solid-state relay PC1 and then grounded. A programmable analog signal circuit outputs a DAC1 signal of corresponding amplitude from pin 14 of MCU controller U4 according to the host computer instruction. After being amplified by operational amplifier U14A, the signal is coupled out as DA1 by resistor R3. Another programmable analog signal circuit outputs a DAC2 signal of corresponding amplitude from pin 15 of MCU controller U4 according to the host computer instruction. After being amplified by operational amplifier U14B, the signal is coupled out as DA2 by resistor R36. A high-level enable... The signal circuit consists of two parts: a high / low level signal PSON1, output from pin 2 of MCU controller U4 according to the host computer command, which is amplified by transistors Q3 and Q4 and then output as enable signal EN-H1 via resistor R49; a high-level enable signal PSON2, output from pin 3 of MCU controller U4 according to the host computer command, which is amplified by transistors Q5 and Q6 and then output as enable signal EN-H2 via resistor R50; and a low-level enable signal PSON3, output from pin 4 of MCU controller U4 according to the host computer command, which is amplified by transistor Q7 and then output as low-level enable signal EN-L1.Another low-level enable signal circuit outputs a corresponding high / low level signal PSON4 from pin 5 of the MCU controller U4 according to the host computer command. This signal is then amplified by transistor Q8 and output as a corresponding low-level enable signal EN-L2. A switch enable signal circuit outputs a corresponding high / low level signal Short_1 from pin 6 of the MCU controller U4 according to the host computer command. This signal drives the optical solid-state relay PC1 via resistor R53, outputting corresponding switch enable signals EN-K1A and EN-K1B. Another switch enable signal circuit outputs a corresponding high / low level signal Short_2 from pin 20 of the MCU controller U4 according to the host computer command. This signal drives the optical solid-state relay PC2 via resistor R65, outputting corresponding switch enable signals EN-K2A and EN-K2B.

[0041] In this embodiment, the multi-functional communication control module based on the RS485 bus also includes a power supply 6, which is electrically connected to the MCU controller 1. The power supply serves as a unified input for external power. An external 12V power supply powers the isolated auxiliary power supply circuit via the power input interface. The auxiliary power supply is a DC / DC converter with multiple voltage outputs. DC output 1 and DC output 2 are independent, isolated power supplies. DC output 1 powers the RS485 bus-side communication interface, while DC output 2 powers the MCU controller, peripheral-side communication interface, control signal output interface, and signal input interface circuits. The power supply ensures the normal operation of each unit circuit by providing voltage. The external power supply for the entire unit comes from connectors CN3 and CN4 (connected in parallel for easy power supply to the next module when using multiple modules). The positive terminal of the power supply is split into two paths after passing through fuse F1. One path powers the center tap of the primary winding T1A of the push-pull transformer via diode D1, and the other path powers the PWM control chip U3 via D2. U3 outputs a pair of complementary PWM signals through pins 11 and 14 to drive switching transistors Q15 and Q16 respectively, causing the primary winding T1A of the transformer to generate a high-frequency alternating magnetic field, which in turn generates high-frequency AC voltages on two other independent and isolated windings. The AC voltage generated by winding T1C is rectified by rectifier bridge BD2 to output a DC voltage of approximately 12V. After being stepped down by three-terminal regulator U16, a stable DC voltage of 5V (+5V2) is output, providing power to the RS485 interface circuit on the bus side. The AC voltage generated by winding T1B is rectified by rectifier bridge BD1 to output a DC voltage of about 12V. One path is stepped down by three-terminal regulator U8 to output a stable 5V DC voltage (+5V1) to power the peripheral side interface circuit; the other path is stepped down by three-terminal regulator U15 to output a stable 3.3V DC voltage (+3.3V) to power the MCU.

[0042] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A multi-functional communication control module based on an RS485 bus, characterized in that, It includes an MCU controller, a bus-side communication interface circuit, a peripheral communication interface circuit, a control signal output interface circuit, and a control signal input interface circuit. The MCU controller is electrically connected to the bus-side communication interface circuit, the peripheral communication interface circuit, the control signal output interface circuit, and the control signal input interface circuit, respectively. The MCU controller is used for signal processing and control, and is connected to an external monitoring computer through the bus-side communication interface circuit to receive parameter settings from the monitoring computer and return relevant data. The bus-side communication interface circuit is used to set the unique address of the MCU controller on the RS485 bus, so as to realize data communication between the MCU controller and the external monitoring computer. The peripheral communication interface circuit is configured via an external monitoring computer to match different products under test, as required. The control signal output interface circuit is used for standby, power on / off control, output current adjustment, and expansion of auxiliary control functions of the product under test. The control signal input interface circuit acquires the relevant voltage signals output by the product under test and receives the logic levels output by the product under test.

2. The multi-functional communication control module based on RS485 bus according to claim 1, characterized in that, The bus-side communication interface circuit includes an RS485 level conversion circuit, an isolation optocoupler, and an address code selection switch. The RS485 level conversion circuit is electrically connected to the isolation optocoupler, and the isolation optocoupler and the address code selection switch are respectively electrically connected to the MCU controller.

3. The multi-functional communication control module based on RS485 bus according to claim 1, characterized in that, The control signal input interface circuit includes a first analog voltage input interface circuit, a second analog voltage input interface circuit, a first logic signal input interface circuit, and a second logic signal input interface circuit. The first analog voltage input interface circuit, the second analog voltage input interface circuit, the first logic signal input interface circuit, and the second logic signal input interface circuit are electrically connected to the MCU controller. The first analog voltage input interface circuit and the second analog voltage input interface circuit are both used to acquire relevant voltage signals output by the product under test. The first logic signal input interface circuit and the second logic signal input interface circuit are both used to receive the logic level output by the product under test.

4. The multi-functional communication control module based on RS485 bus according to claim 3, characterized in that, The first analog voltage input interface circuit includes resistors R41, R42, R43, and capacitor C30. One end of resistor R41 is electrically connected to one end of resistor R42. The other end of resistor R42 is electrically connected to one end of resistor R43 and one end of capacitor C30 and then connected to pin 16 of the MCU controller. The other end of resistor R43 is electrically connected to the other end of capacitor C30 and then grounded.

5. The multi-functional communication control module based on RS485 bus according to claim 3, characterized in that, The first logic signal input interface circuit includes an electrostatic discharge (ESD) protector TV7, a coupling resistor R55, and a Zener diode Z3. One end of the ESD protector TV7 is grounded, and the other end of the ESD protector TV7 is electrically connected to one end of the coupling resistor R55. The other end of the coupling resistor R55 is electrically connected to one end of the Zener diode Z3 and then connected to pin 39 of the MCU controller. The other end of the Zener diode Z3 is grounded.

6. The multi-functional communication control module based on RS485 bus according to claim 1, characterized in that, The control signal output interface circuit includes two programmable analog signal circuits, two high-level enable signal circuits, two low-level enable signal circuits, and two switch enable signal circuits. The two programmable analog signal circuits, the two high-level enable signal circuits, the two low-level enable signal circuits, and the two switch enable signal circuits are all electrically connected to the MCU controller.

7. The multi-functional communication control module based on RS485 bus according to claim 6, characterized in that, The programmable analog signal circuit includes an operational amplifier U14A, resistor R3, capacitor R27, resistor R35, resistor R6, resistor R7, resistor R4, and capacitor R28. Pin 1 of the operational amplifier U14A is electrically connected to one end of resistor R3, one end of resistor R4, and one end of capacitor R28. Pin 2 of the operational amplifier U14A is electrically connected to the other end of resistor R4, the other end of capacitor R28, and one end of resistor R7. The other end of resistor R7 is grounded. Pin 8 of the operational amplifier U14A is connected to 12V DC and electrically connected to one end of capacitor R27. The other end of capacitor R27 is grounded. Pin 3 of the operational amplifier U14A is electrically connected to one end of resistor R35 and one end of resistor R6. The other end of resistor R35 is grounded. Pin 4 of the operational amplifier U14A is grounded.

8. The multi-functional communication control module based on RS485 bus according to claim 6, characterized in that, The high-level enable signal circuit includes transistors Q3 and Q4, and resistor R49. The emitter (E) of transistor Q3 is grounded, the collector (C) of transistor Q3 is electrically connected to the base (B) of transistor Q4, and the collector (C) of transistor Q4 is electrically connected to one end of resistor R49.

9. The multi-functional communication control module based on RS485 bus according to claim 6, characterized in that, The switch enable signal circuit includes resistor R53, resistor R54, and optical solid-state relay PC1. One end of resistor R53 is electrically connected to one end of resistor R54 and pin 1 of optical solid-state relay PC1, and the other end of resistor R54 is electrically connected to pin 2 of optical solid-state relay PC1 and then grounded.

10. The multi-functional communication control module based on RS485 bus according to claim 1, characterized in that, The multi-functional communication control module based on RS485 bus also includes a power supply, which is electrically connected to the MCU controller.

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