Communication extension configurable circuit and converter

Abstract

The utility model discloses a communication extension configurable circuit and a converter, relates to the technical field of robot electronics, and discloses a communication extension configurable circuit which comprises a USB extension UART module and a serial port type conversion and configuration module. The USB extended UART module is respectively connected with a USB interface of external equipment and the input end of the serial port type conversion and configuration module, the USB interface is converted into a UART serial port and an IO port through the USB extended UART module, the type of the UART serial port provided by the USB extended UART module is configured through the serial port type conversion and configuration module, and the problems that the number of master control communication interfaces is small, and the type of the serial port cannot be flexibly selected and configured are solved.

Description

Technical Field

[0001] This application relates to the field of robot electronics, and particularly to a communication expansion configurable circuit and a converter. Background Art

[0002] With the rapid progress and wide application of robot technology, robots have penetrated into numerous industries and different application scenarios. To meet various complex operation requirements, robots usually need to be equipped with various different component modules, each of which bears a specific function, such as a sensor module for data acquisition, an actuator module for action execution, a communication module for data transmission, etc.

[0003] In a robot system, the communication between modules and the main control is crucial. However, due to the different design standards of each component module and application scenarios, the types of communication interfaces they adopt are not unified. In serial communication, there are various standards including UART (Universal Asynchronous Receiver / Transmitter), RS232 (Serial Communication Interface Standard), RS485 (Differential Data Transmission Interface Standard), etc., and each communication interface requires the configuration of a corresponding extension conversion module, which undoubtedly increases the complexity and cost of the system. Summary of the Utility Model

[0004] The main purpose of this application is to provide a communication expansion configurable circuit and a converter, aiming to solve the technical problem that the main control communication interface is less and the serial port type cannot be flexibly selected.

[0005] To achieve the above object, this application proposes a communication expansion configurable circuit, and the communication expansion configurable circuit includes: a USB extended UART module and a serial port type conversion and configuration module.

[0006] The USB extended UART module is respectively connected to the USB interface of an external device and the input end of the serial port type conversion and configuration module, and is used to convert the USB interface into a UART serial port and an IO port; the serial port type conversion and configuration module is used to configure the UART serial port type of the USB extended UART module.

[0007] In one embodiment, the serial port type conversion and configuration module includes at least one of an RS232-RS485 configuration unit, an RS232-UART configuration unit, and an RS485-UART configuration unit.

[0008] The RS232-RS485 configuration unit is connected to any UART serial port of the USB extended UART module and is used to change the type of the UART serial port to RS232 type or RS485 type; the RS232-UART configuration unit is connected to any UART serial port of the USB extended UART module and is used to change the type of the UART serial port to RS232 type or convert the input / output level of the UART serial port; the RS485-UART configuration unit is connected to any UART serial port of the USB extended UART module and is used to change the type of the UART serial port to RS485 type or convert the input / output level of the UART serial port.

[0009] In an embodiment, the RS232-RS485 configuration unit includes: an RS232 transceiver processing unit, an RS485 transceiver processing unit, and a selection unit; the selection unit includes a connection unit, a first point pair, a second point pair, and a third point pair; the first point pair is connected to any UART serial port of the USB extended UART module; the second point pair is connected to the UART serial port of the RS232 transceiver processing unit; the third point pair is connected to the UART serial port of the RS485 transceiver processing unit; the selection unit establishes a connection between the first point pair and the second point pair or between the first point pair and the third point pair through the connection unit so that any UART serial port of the USB extended UART module is converted into an RS232 type serial port through the RS232 transceiver processing unit or into an RS485 type serial port through the RS485 transceiver processing unit.

[0010] In an embodiment, the RS232-UART configuration unit includes: an RS232 transceiver processing unit, a UART level conversion unit, and a selection unit; the selection unit includes a connection unit, a first point pair, a second point pair, and a third point pair; the first point pair is connected to any UART serial port of the USB extended UART module; the second point pair is connected to the UART serial port of the RS232 transceiver processing unit; the third point pair is connected to the UART serial port of the UART level conversion unit; the selection unit establishes a connection between the first point pair and the second point pair or between the first point pair and the third point pair through the connection unit so that any UART serial port of the USB extended UART module is converted into an RS232 type serial port through the RS232 transceiver processing unit or the input / output level of the UART serial port is converted through the UART level conversion unit.

[0011] In one embodiment, the RS485-UART configuration unit includes: an RS485 transceiver processing unit, a UART level conversion unit, and a selection unit; the selection unit includes a connection unit, a first point pair, a second point pair, and a third point pair; the first point pair is connected to any UART serial port of the USB extended UART module; the second point pair is connected to the UART serial port of the RS485 transceiver processing unit; the third point pair is connected to the UART serial port of the UART level conversion unit; the selection unit establishes a connection between the first point pair and the second point pair or between the first point pair and the third point pair through the connection unit so that any UART serial port of the USB extended UART module is converted into an RS485 type serial port through the RS485 transceiver processing unit or the input and output levels of the UART serial port are converted through the UART level conversion unit.

[0012] In one embodiment, the connection unit includes: a zero-ohm resistor or a jumper chip.

[0013] The zero-ohm resistor is used to be soldered between the first point pair and the second point pair to connect the first point pair and the second point pair or soldered between the first point pair and the third point pair to connect the first point pair and the third point pair; the first pair of jumper posts, the second pair of jumper posts, and the third pair of jumper posts of the jumper chip are respectively connected to the first point pair, the second point pair, and the third point pair.

[0014] In one embodiment, the UART level conversion unit includes: a compatible input unit; the compatible input unit is connected to the third point pair, and when a connection is established between the first point pair and the third point pair, it enables the serial port provided by the USB extended UART module to compatibly receive a level signal higher than a preset input signal; or, the UART level conversion unit includes: a conversion output unit; the conversion output unit is connected to the third point pair, and when a connection is established between the first point pair and the third point pair, it enables the serial port provided by the USB extended UART module to output a level signal higher than a preset output signal.

[0015] In one embodiment, the compatible input unit includes: an auxiliary power supply, a first resistor, and a Schottky diode. The first resistor has a first end connected to the auxiliary power supply and a second end connected to the anode of the Schottky diode; the Schottky diode has an anode connected to the receiving point of the third point pair.

[0016] In one embodiment, the circuit further includes: a USB-HUB expansion module. The USB-HUB expansion module is connected to the USB port of an external device and is used to provide additional USB expansion ports; the USB expansion UART module is further used to connect to the additional USB expansion ports to achieve cascading of the board to expand more required communication ports.

[0017] In addition, to achieve the above object, the present application also proposes a communication expansion configurable converter, and the converter applies the communication expansion configurable circuit as described above.

[0018] One or more technical solutions proposed by the present application have at least the following technical effects:

[0019] The USB interface is converted into a UART serial port and an IO port through the USB expansion UART module, and the type of the UART serial port provided by the USB expansion UART module is configured through the serial port type conversion and configuration module, so as to solve the problem that the main control communication interface is less and the serial port type cannot be flexibly selected. Description of the Drawings

[0020] The drawings here are incorporated into the specification and constitute a part of this specification, showing the embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a structural block diagram provided for Embodiment 1 of the communication expansion configurable circuit of the present application;

[0023] Figure 2 It is a topological structure diagram of the serial port type and configuration module provided for Embodiment 1 of the communication expansion configurable circuit of the present application;

[0024] Figure 3 It is a connection relationship diagram of the RS232-RS485 configuration unit provided for Embodiment 2 of the communication expansion configurable circuit of the present application;

[0025] Figure 4 It is a connection relationship diagram of the RS232-UART configuration unit provided for Embodiment 2 of the present application;

[0026] Figure 5 It is a connection relationship diagram of the RS485-UART configuration unit provided for Embodiment 2 of the present application;

[0027] Figure 6The circuit connection diagram of the compatible input unit provided in the second embodiment of the present application;

[0028] Figure 7 The structural block diagram provided in the third embodiment of the communication expansion configurable circuit of the present application.

[0029] Explanation of the attached drawing reference numerals:

[0030] Label Description Label Description 10 USB Extended UART Module 205 Compatible Input Unit 20 Serial Port Type Conversion and Configuration Module AA' First Point Pair 21 RS232-RS485 Configuration Unit BB' Second Point Pair 22 RS232-UART Configuration Unit CC' Third Point Pair 23 RS485-UART Configuration Unit VCC Auxiliary Power Supply 201 RS232 Transceiver Processing Unit R1 First Resistor 202 RS485 Transceiver Processing Unit Q1 Schottky Diode 203 UART Level Conversion Unit 30 USB-HUB Expansion Module 204 Selection Unit

[0031] The realization of the purpose, functional features and advantages of the present application will be further described with reference to the accompanying drawings in combination with the embodiments. Detailed implementation manners

[0032] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0033] In order to better understand the technical solutions of the present application, the following will be described in detail in combination with the accompanying drawings of the specification and specific implementation manners.

[0034] Currently, in the main control system of a robot, the communication between each component module and the main control is crucial. However, due to the different technical sources, design standards, and application scenarios of each component module, the types of communication interfaces they adopt are often not unified.

[0035] And due to considerations such as cost, design complexity, and universality, only a limited number of communication interfaces are usually equipped, and the types of these interfaces are also relatively fixed. This results in that in a robot system, a single main control communication interface cannot meet the communication requirements of all component modules.

[0036] In addition, the existing communication expansion or conversion modules not only have a small expansion quantity, but also cannot configure the specific communication type and quantity as needed. Generally, they are fixed-designed communication expansion or conversion types and quantities, which will cause differences in the number and structure of circuit boards each time of production, bringing problems to the consistency and production of the equipment.

[0037] Therefore, in order to solve the problem that there are fewer main control communication interfaces and the serial port type cannot be flexibly selected. The present application proposes a communication expansion configurable circuit. Please refer to Figure 1 , Figure 1 The structural block diagram provided in the first embodiment of the communication expansion configurable circuit of the present application.

[0038] In the first embodiment of the present application, the communication expansion configurable circuit includes: a USB expansion UART module 10 and a serial port type conversion and configuration module 20.

[0039] Among them, the USB extended UART module 10 is respectively connected to the USB interface of the external device and the input end of the serial port type conversion and configuration module 20.

[0040] It should be noted that the USB interface of the external device refers to one USB port of the main control system of the robot. The USB extended UART module 10 is connected to one USB port of the main control system of the robot, and converts this one USB port into multiple UART serial ports and multiple IO ports, that is, the USB extended UART module 10 is used to convert the USB interface into UART serial ports and IO ports.

[0041] Among them, the USB extended UART module 10 selects a USB1 to expand 4 UART chip, which can convert this one USB input port into 4 UART serial ports and 6 IO ports.

[0042] In addition, the input end of the serial port type conversion and configuration module 20 is connected to the UART serial port of the USB extended UART module 10.

[0043] It should be noted that the serial port type conversion and configuration module 20 communicates with the UART serial port of the USB extended UART module 10, and is used to configure the UART serial port type of the USB extended UART module 10.

[0044] Furthermore, please refer to Figure 2 , Figure 2 which is the topology diagram of the serial port type and configuration module 20 provided in the first embodiment of the communication extension configurable circuit of the present application.

[0045] Since the robot system includes various different standards such as UART (Universal Asynchronous Receiver-Transmitter), RS232 (Serial Communication Interface Standard), and RS485 (Differential Data Transmission Interface Standard) in the common communication method of serial port communication. Therefore, in this embodiment, the serial port type conversion and configuration module 20 provides at least one of the RS232-RS485 configuration unit 21, the RS232-UART configuration unit 22, and the RS485-UART configuration unit 23.

[0046] Among them, the RS232-RS485 configuration unit 21 is connected to any UART serial port of the USB extended UART module 10.

[0047] It should be noted that the RS232-RS485 configuration unit communicates with the UART serial port by connecting to any UART serial port of the USB extended UART module 10, changing the type of the UART serial port to RS232 type or RS485 type. The change of the UART serial port type to RS232 type or RS485 type is selected through external manual settings to change the UART serial port type to RS232 type or RS485 type.

[0048] Among them, the RS232-UART configuration unit 22 is connected to any UART serial port of the USB extended UART module 10.

[0049] It should be noted that the RS232-UART configuration unit 22 communicates with the UART serial port by connecting to any UART serial port of the USB extended UART module 10, changing the type of the UART serial port to RS232 type or converting the input / output level of the UART serial port. The change of the UART serial port type to RS232 type or the conversion of the input / output level of the UART serial port is selected through external manual settings to change the UART serial port type to RS232 type or to convert the input / output level of the UART serial port.

[0050] Among them, the RS485-UART configuration unit 23 is connected to any UART serial port of the USB extended UART module 10.

[0051] It should be noted that the RS232-UART configuration unit 22 communicates with the UART serial port by connecting to any UART serial port of the USB extended UART module 10, changing the type of the UART serial port to RS485 type or converting the input / output level of the UART serial port. The change of the UART serial port type to RS485 type or the conversion of the input / output level of the UART serial port is selected through external manual settings to change the UART serial port type to RS485 type or to convert the input / output level of the UART serial port.

[0052] Further, the USB extended UART module 10 selects the four UART serial ports provided by the USB1 extended 4UART chip. According to requirements, any one of the RS232-RS485 configuration unit 21, RS232-UART configuration unit 22, and RS485-UART configuration unit 23 can be selected for each UART serial port, and multiple combinations can be generated. For example, the first UART serial port can select the RS232-RS485 configuration unit 21; the second UART serial port can select the RS232-UART configuration unit 22; the third UART serial port can select the RS485-UART configuration unit 23, and the fourth UART serial port can select the RS232-UART configuration unit 23, so as to realize the flexible configuration of the four UART serial ports.

[0053] In the first embodiment, the USB extended UART module 10 converts the USB interface into a UART serial port and an IO port. The type of the UART serial port provided by the USB extended UART module is configured through the serial port type conversion and configuration module. By extending the USB port into a UART port and an IO port and configuring the type of the UART port, the problems of few main control communication interfaces and inability to flexibly select the serial port type are solved.

[0054] Please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 3 、 Figure 4 and Figure 5 Figures, and are the connection diagrams of the RS232-RS485 configuration unit 21, RS232-RS485 configuration unit 22, and RS232-RS485 configuration unit 23 provided by the second embodiment of the communication extension configurable circuit, respectively. Further, on the basis of the first embodiment, the present application proposes the second embodiment.

[0055] In the second embodiment, the RS232-RS485 configuration unit 21 includes: an RS232 transceiver processing unit 201, an RS485 transceiver processing unit 202, and a selection unit 204.

[0056] Among them, the selection unit 204 includes a connection unit, a first point pair AA', a second point pair BB', and a third point pair CC'.

[0057] It should be noted that the first point pair AA' is connected to any UART serial port of the USB extended UART module 10; the second point pair BB' is connected to the UART serial port of the RS232 transceiver processing unit 201; the third point pair CC' is connected to the UART serial port of the RS485 transceiver processing unit 202.

[0058] It should be noted that the selection unit 204 has a selection function. Through the connection unit, a connection is selected to be established between the first pair of points AA' and the second pair of points BB' or a connection is selected to be established between the first pair of points AA' and the third pair of points CC' so that the first pair of points AA' is connected to the second pair of points BB' or the first pair of points AA' is connected to the third pair of points CC'.

[0059] Among them, the connection unit is a zero-ohm resistor. By manually soldering the zero-ohm resistor between the first pair of points AA' and the second pair of points BB' to connect the first pair of points AA' and the second pair of points BB' or manually soldering the zero-ohm resistor between the first pair of points AA' and the third pair of points CC' to connect the first pair of points AA' and the third pair of points CC'. By manually soldering the first pair of points AA' and the second pair of points BB' or soldering the first pair of points AA' and the third pair of points BB' with the zero-ohm resistor, the selection function is thus realized. When wanting to reselect, the zero-ohm resistor can be removed and re-soldered.

[0060] In another embodiment, the connection unit is a jumper chip. The first pair of jumper pins, the second pair of jumper pins, and the third pair of jumper pins of the jumper chip are respectively connected to the first pair of points AA', the second pair of points BB', and the third pair of points CC'. By manually inserting the jumper cap into the first pair of jumper pins and the second pair of jumper pins or inserting it into the first pair of jumper pins and the third pair of jumper pins, a stable electrical connection is established to connect the first pair of points AA' and the second pair of points BB' or the first pair of points AA' and the third pair of points CC'. The selection function is realized by manually inserting the jumper cap into the first pair of jumper pins and the second pair of jumper pins or inserting it into the first pair of jumper pins and the third pair of jumper pins. When wanting to reselect, the jumper cap can be pulled out and re-inserted into the corresponding jumper pins.

[0061] Furthermore, when the selection unit 204 establishes a connection between the RS232 transceiver processing unit 201 and any UART serial port of the USB extended UART module 10, that is, when the first pair of points AA' and the second pair of points BB' are connected, the RS232 transceiver processing unit 201 communicates with any UART serial port of the USB extended UART module 10 to convert the UART serial port into the RS232 type. The RS232 transceiver processing unit 201 is a 232 transceiver level conversion chip.

[0062] In addition, when the selection unit 204 establishes a connection between the RS485 transceiver processing unit 202 and any UART serial port of the USB extended UART module 10, that is, when the first point pair AA' is connected to the third point pair CC', the RS485 transceiver processing unit 202 communicates with any UART serial port of the USB extended UART module 10 to convert the UART serial port into the RS485 type. The RS485 transceiver processing unit 202 is a 485 transceiver level conversion chip, and the 485 transceiver level conversion chip is also connected to the differential signal transmission circuit.

[0063] Any UART serial port of the USB extended UART module 10 is converted into an RS232 type serial port through the RS232 transceiver processing unit 201 or into an RS485 type serial port through the RS485 transceiver processing unit 202 to achieve selection and configuration.

[0064] The RS232-UART configuration unit 22 includes an RS232 transceiver processing unit 201, a UART level conversion unit 203, and a selection unit 204. The selection unit 204 includes a connection unit, a first point pair AA', a second point pair BB', and a third point pair CC'.

[0065] Among them, the first point pair AA' is connected to any UART serial port of the USB extended UART module 10; the second point pair BB' is connected to the UART serial port of the RS232 transceiver processing unit 201; the third point pair CC' is connected to the UART serial port of the UART level conversion unit 203; the selection unit selects to establish a connection between the first point pair and the second point pair or selects to establish a connection between the first point pair and the third point pair through the connection unit.

[0066] It should be noted that when the selection unit 204 establishes a connection between the UART level conversion unit 203 and any UART serial port of the USB extended UART module 10, that is, when the first point pair AA' is connected to the third point pair CC', the UART level conversion unit 203 communicates with any UART serial port of the USB extended UART module 10 to convert the input and output levels of the UART serial port.

[0067] It is worth noting that the UART level conversion unit 203 includes a compatible input unit 205; the compatible input unit 205 is connected to the third point pair CC', and when the first point pair AA' is connected to the third point pair CC', it enables any serial port provided by the USB extended UART module 10 to compatibly receive a level signal higher than the preset input signal. In this embodiment, the level signal of the preset input signal is 3.3V.

[0068] Further, please refer to Figure 6 ,Figure 6 This is the circuit connection diagram of the compatible input unit provided in the second embodiment of the present application. The compatible input unit 205 includes an auxiliary power supply VCC, a first resistor R1, and a Schottky diode Q1. The first end of the first resistor R1 is connected to the auxiliary power supply VCC, and the second end is connected to the anode of the Schottky diode Q1; the anode of the Schottky diode Q1 is also connected to the receiving point C of the third point pair.

[0069] It should be noted that when a signal flows in from the cathode of the Schottky diode Q1, it is restricted by the Schottky diode Q1, thereby achieving compatible input.

[0070] In another embodiment, the UART level conversion unit 203 is a conversion output unit; the conversion output unit is connected to the third point pair CC'. When a connection is established between the first point pair AA' and the third point pair CC', the serial port provided by the USB extended UART module can output a level signal higher than a preset output signal. Among them, the level signal of the preset output signal is 3.3V, and the conversion output unit selects a 3.3V to 5V chip.

[0071] Any UART serial port of the USB extended UART module 10 is converted into an RS232 type serial port through the RS232 transceiver processing unit 201 or the input and output levels of the UART serial port are converted through the UART level conversion unit 203 to achieve selection and configuration.

[0072] The RS485-UART configuration unit 23 includes an RS485 transceiver processing unit 202, a UART level conversion unit 203, and a selection unit 204. The selection unit 204 includes a connection unit, a first point pair AA', a second point pair BB', and a third point pair CC'.

[0073] Among them, the first point pair AA' is connected to any UART serial port of the USB extended UART module 10; the second point pair BB' is connected to the UART serial port of the RS485 transceiver processing unit 202; the third point pair CC' is connected to the UART serial port of the UART level conversion unit 203. The selection unit 204 establishes a connection between the first point pair AA' and the second point pair BB' or between the first point pair AA' and the third point pair CC' through the connection unit.

[0074] Any UART serial port of the USB extended UART module 10 is converted into an RS485 type serial port through the RS485 transceiver processing unit 202 or the input and output levels of the UART serial port are converted through the UART level conversion unit 203 to achieve selection and configuration.

[0075] Please refer to Figure 7 ,Figure 7 Block diagram provided by the third embodiment of the communication expansion configurable circuit of the present application. Further, on the basis of the above embodiment, the present application proposes the third embodiment.

[0076] The communication expansion configurable circuit further includes a USB-HUB expansion module 30. The USB-HUB expansion module 30 is connected to the USB interface of an external device and is used to provide additional USB expansion ports. Among them, the USB-HUB expansion module 30 is a USB to 4HUB chip that can provide 4 USB expansion ports.

[0077] It should be noted that the USB expansion UART module 10 is connected to one of the additional USB expansion ports. In this embodiment, three USB expansion ports will be unused, and the remaining USB expansion ports can continue to be connected to the USB-HUB expansion module 30 or the USB expansion UART module 10, so as to realize the cascading of this circuit to expand more required communication ports.

[0078] The present application also proposes a communication expansion configurable converter. The converter includes the communication expansion configurable circuit of each of the above embodiments. The specific circuit structure of the communication expansion configurable circuit refers to the above embodiments. Since this converter adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0079] The above are only some embodiments of the present application, and thus do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A communication extension configurable circuit, characterized in that: The circuit comprises: a USB expansion UART module and a serial port type conversion and configuration module; The USB extension UART module is connected to the USB interface of the external device and the input end of the serial port type conversion and configuration module respectively, and is used to convert the USB interface into a UART serial port and an IO port; The serial port type conversion and configuration module is used to configure the type of the UART serial port of the USB expansion UART module.

2. The communication expansion configurable circuit according to claim 1, characterized in that: The serial port type conversion and configuration module includes: at least one of an RS232-RS485 configuration unit, an RS232-UART configuration unit, and an RS485-UART configuration unit; The RS232-RS485 configuration unit is connected to any UART serial port of the USB expansion UART module, and is used to change the type of the UART serial port to RS232 type or RS485 type; The RS232-UART configuration unit is connected to any UART serial port of the USB expansion UART module, and is used to change the type of the UART serial port to the RS232 type or convert the input and output levels of the UART serial port; The RS485-UART configuration unit is connected to any UART serial port of the USB expansion UART module, and is used to change the type of the UART serial port to the RS485 type or convert the input and output levels of the UART serial port.

3. The communication expansion configurable circuit according to claim 2, characterized in that: The RS232-RS485 configuration unit includes: an RS232 transceiver processing unit, an RS485 transceiver processing unit and a selection unit; the selection unit includes a connection unit, a first point position pair, a second point position pair and a third point position pair; The first point pair is connected to any UART serial port of the USB expansion UART module; The second point pair is connected to the UART serial port of the RS232 transceiver processing unit; The third point pair is connected to the UART serial port of the RS485 transceiver processing unit; The selection unit establishes a connection between the first point pair and the second point pair or between the first point pair and the third point pair through the connection unit so that any UART serial port of the USB expansion UART module is converted into an RS232 type serial port through the RS232 transceiver processing unit or converted into an RS485 type serial port through the RS485 transceiver processing unit.

4. The communication expansion configurable circuit according to claim 2, characterized in that: The RS232-UART configuration unit includes: an RS232 transceiver processing unit, a UART level conversion unit and a selection unit; the selection unit includes a connection unit, a first point position pair, a second point position pair and a third point position pair; The first point pair is connected to any UART serial port of the USB expansion UART module; The second point pair is connected to the UART serial port of the RS232 transceiver processing unit; The third point pair is connected to the UART serial port of the UART level conversion unit; The selection unit establishes a connection between the first point pair and the second point pair or between the first point pair and the third point pair through the connection unit so that any UART serial port of the USB expansion UART module is converted into an RS232 type serial port through the RS232 transceiver processing unit or the input and output levels of the UART serial port are converted through the UART level conversion unit.

5. The communication expansion configurable circuit according to claim 2, characterized in that: The RS485-UART configuration unit includes: an RS485 transceiver processing unit, a UART level conversion unit and a selection unit; the selection unit includes a connection unit, a first point position pair, a second point position pair and a third point position pair; The first point pair is connected to any UART serial port of the USB expansion UART module; The second point pair is connected to the UART serial port of the RS485 transceiver processing unit; The third point pair is connected to the UART serial port of the UART level conversion unit; The selection unit establishes a connection between the first point pair and the second point pair or between the first point pair and the third point pair through the connection unit so that any UART serial port of the USB expansion UART module is converted into an RS485 type serial port through the RS485 transceiver processing unit or the input and output levels of the UART serial port are converted through the UART level conversion unit.

6. The communication expansion configurable circuit according to any one of claims 3 to 5, characterized in that: The connecting unit includes: a zero-ohm resistor or a jumper chip; The zero-ohm resistor is used to be welded between the first point pair and the second point pair to connect the first point pair and the second point pair, or welded between the first point pair and the third point pair to connect the first point pair and the third point pair; The first pair of jumper posts, the second pair of jumper posts and the third pair of jumper posts of the jumper chip are respectively connected to the first point position pair, the second point position pair and the third point position pair.

7. The communication expansion configurable circuit according to claim 4 or 5, characterized in that: The UART level conversion unit comprises: a compatible input unit; The compatible input unit is connected to the third point pair, so that when the first point pair is connected to the third point pair, the serial port provided by the USB extension UART module can be compatible with receiving a level signal higher than a preset input signal; or The UART level conversion unit comprises: a conversion output unit; The conversion output unit is connected to the third point pair, so that when the first point pair is connected to the third point pair, the serial port provided by the USB expansion UART module can output a level signal higher than the preset output signal.

8. The communication expansion configurable circuit according to claim 7, characterized in that: The compatible input unit includes: an auxiliary power supply, a first resistor and a Schottky diode; The first resistor has a first end connected to the auxiliary power supply and a second end connected to the anode of the Schottky diode; The Schottky diode has an anode connected to the receiving point of the third point pair.

9. The communication expansion configurable circuit according to any one of claims 1 to 5, characterized in that: The circuit also includes: a USB-HUB expansion module; The USB-HUB expansion module is connected to the USB port of an external device and is used to provide an additional USB expansion port; The USB expansion UART module is also used to connect the additional USB expansion port to achieve cascading of this board to expand more required communication ports.

10. A communication extension configurable converter, characterized in that: The converter uses a communication expansion configurable circuit as claimed in any one of claims 1 to 9.

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