CN210052154U

CN210052154U - USB-to-serial communication equipment with isolation

Info

Publication number: CN210052154U
Application number: CN201920974910.8U
Authority: CN
Inventors: 李铭
Original assignee: Jingzhou Chenlin Intelligent Technology Co Ltd
Current assignee: Jingzhou Chenlin Intelligent Technology Co Ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-02-11
Anticipated expiration: 2029-06-26

Abstract

The utility model relates to a data communication field, concretely relates to USB of area isolation changes serial ports communication equipment. In the industrial and civil communication field, a USB-to-UART serial port converter is used in large quantity, but the existing converter has short communication distance and complex circuit, only supports point-to-point communication, has poor anti-interference capability and even can cause damage to host hardware. In order to solve the problem, the utility model provides a USB of area isolation changes serial ports communication equipment, change UART chip, isolation protection conversion module, power supply system, RS485 interface including USB interface, state feedback module, USB. The utility model relates to a novelty is reasonable, and the reliability of high-speed communication is high, and is simple to use, and communication distance is far away, can carry out the network deployment communication between the multiple spot, and the interference killing feature is high, and the practicality is strong, and popularization and application is worth the height.

Description

USB-to-serial communication equipment with isolation

Technical Field

The invention relates to the field of data communication, in particular to a USB-to-serial communication device with isolation.

Background

In industrial and civil communication fields, UART serial port communication is often needed, and due to the popularization of USB communication interfaces, a USB-to-UART serial port converter is widely used, but the existing converter has the following problems:

1. the universal conversion is generally an RS232 protocol in a USB communication interface, and the RS232 communication protocol has short communication distance and complex circuit and only supports point-to-point communication.

2. The RS232 protocol is a common mode circuit, and is very easy to be interfered by electromagnetic interference under the working environment with strong electromagnetic interference, so that communication errors are caused.

3. Most adopt the through circuit, under the operating environment of strong electromagnetic interference, electromagnetic pollution can follow the circuit serial entering USB communication host computer, disturbs the normal work of host computer, serious can cause host computer hardware to damage even.

Disclosure of Invention

In order to solve the problems, the invention provides a USB-to-serial communication device with isolation.

In order to achieve the above object, the present invention is achieved by the following technical solutions: the utility model provides a USB of area isolation changes serial ports communication equipment which characterized in that: the USB-to-UART interface protection circuit board comprises a USB interface, a state feedback module, a USB-to-UART chip, an isolation protection conversion module, a power supply system and an RS485 interface, wherein the modules are integrated on 1 circuit board.

The USB interfaces comprise 1 USB interface J1, and are used for connecting the upper device and supplying power to the system.

The state feedback module comprises 5 LEDs and 5 resistors and is used for feeding back communication and power supply states.

The USB-to-UART chip comprises 1 CH340E chip U2 and 1 capacitor C1, and is used for converting USB communication into UART communication and controlling the hardware flow direction of an RS485 protocol through a THROW port of U2.

The isolation protection conversion module comprises 1 ADM2483 or ISO3082 chip U3 and is used for electromagnetic isolation of communication.

The power supply system comprises 1B 0505 chip U1 and 3 capacitors C2C3C4, and the USB power supply and the RS485 power supply are isolated.

Wherein, the RS485 interface includes 1 4P terminal, 3 resistance R6R7R8, realizes RS485 hardware interface to can provide 5V power supply outwards.

Due to the use of the invention, the following beneficial effects can be obtained:

1. the system adopts a high-performance conversion chip, and can ensure the reliability of long-time high-speed communication.

2. The output of the system is an RS485 communication protocol, the flow control of hardware RS485 is used, the flow control in software is avoided, only 2-wire system connection is needed, the physical connection is simple, the software compiling is simple, and in addition, the multi-point networking communication can be carried out while the communication at the distance of up to 10 kilometers is ensured.

3. The system uses full electromagnetic isolation for power supply and communication data, so that the system has extremely high anti-interference capability and can resist electromagnetic impact of more than 5 kv.

In conclusion, the invention has the advantages of novel and reasonable design, flexible and convenient realization, low cost, networking function, small volume, high reliability, strong practicability and high popularization and application value.

Drawings

FIG. 1 is a system block diagram;

FIG. 2 is a circuit diagram;

FIG. 3 shows a USB interface and a conversion chip circuit;

FIG. 4 is a circuit diagram of a state feedback module;

FIG. 5 is a circuit diagram of a power supply system;

FIG. 6 is a circuit diagram of an isolation protection switching module;

FIG. 7 is an RS485 interface circuit;

in the figure: the system comprises a 1-USB interface, a 2-state feedback module, a 3-USB-to-UART chip, a 4-isolation protection conversion module, a 5-power supply system and a 6-RS485 interface.

Detailed Description

The invention provides a USB-to-serial communication device with isolation as shown in figure 1 (system structure) and figure 2 (hardware circuit board), comprising: the USB-UART interface protection system comprises a USB interface 1, a state feedback module 2, a USB-UART chip 3, an isolation protection conversion module 4, a power supply system 5 and an RS485 interface 6.

Specifically, the USB interface 1 is composed of 1 USB interface J1, and is mainly used for connecting USB host devices.

Specifically, the USB to UART chip 3 is composed of 1 CH340E chip U2 and 1 capacitor C1, and its circuit is directly connected to the USB interface J1 as shown in fig. 3, and is connected to other modules through three lines of Rx, Tx, and THR, for converting the USB communication into UART communication, and implementing hardware flow control of the RS485 protocol through the THROW port of U2, so that it is not necessary to set software flow control when in use.

Specifically, the state feedback module 2 is composed of 5 LED devices D1D2D3D4D5 and 5 resistors R1R2R3R4R5, if shown in fig. 4, D1 displays Rx, D2 displays Tx, D3 displays THR, D4 displays USB power VUSB, D5 displays isolation power V2 and G2 states, thereby feeding back whether the system power is normal and the data communication state.

Specifically, the isolation protection conversion module 4 is composed of 1 ADM2483 or ISO3082 chip U3, as shown in fig. 6, data and current control signals are input through three lines of Rx, Tx, and THR, RS485 signals are output through a line a and a line B, the input end is supplied with power by VUSB, and the output end is supplied with power by V2, so that input and output are realized, including electromagnetic isolation of communication and power supply.

Specifically, the power supply system 5 is composed of 1B 0505 chip U1 and 3 capacitors C2C3C4, as shown in fig. 5, U1 is used for obtaining 5V output power supply by an isolation method from 5V input power supply, and C2C3C4 is used for filtering input and output voltages respectively, stabilizing the voltage, and realizing isolation of a system USB end power supply and an RS485 communication end power supply.

Specifically, the RS485 interface 6 is composed of 1 4P terminal J2 and 3 resistors R6R7R8, as shown in fig. 7, R6R8 is used for communication protection, and R7 is used for RS485 communication, so that an RS485 communication hardware interface is realized, and meanwhile, 5V direct current supply can be provided to the outside for debugging and use of the device.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes, modifications, equivalents, improvements, and the like can be made therein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a USB of area isolation changes serial ports communication equipment which characterized in that: the USB-to-UART interface protection circuit board comprises a USB interface, a state feedback module, a USB-to-UART chip, an isolation protection conversion module, a power supply system and an RS485 interface, wherein the modules are integrated on 1 circuit board.

2. The USB-to-serial communication device with isolation according to claim 1, wherein: the USB interface comprises 1 USB interface J1 for connecting the upper device and supplying power to the system.

3. The USB-to-serial communication device with isolation according to claim 1, wherein: the state feedback module comprises 5 LEDs and 5 resistors and is used for feeding back communication and power supply states.

4. The USB-to-serial communication device with isolation according to claim 1, wherein: the USB-to-UART chip comprises 1 CH340E chip U2 and 1 capacitor C1, and is used for converting USB communication into UART communication and controlling the hardware flow direction of an RS485 protocol through a THROW port of U2.

5. The USB-to-serial communication device with isolation according to claim 1, wherein: the isolation protection switching module comprises 1 ADM2483 or ISO3082 chip U3 as an electromagnetic isolation for communication.

6. The USB-to-serial communication device with isolation according to claim 1, wherein: the power supply system comprises 1B 0505 chip U1 and 3 capacitors C2C3C4, and the USB power supply and the RS485 power supply are isolated.

7. The USB-to-serial communication device with isolation according to claim 1, wherein: the RS485 interface comprises 1 4P terminal and 3 resistors R6R7R8, the RS485 hardware interface is realized, and 5V power supply can be provided outwards.