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USB TO RS485 (B) User Guide

Function Description

CH343G is a USB bus adapter chip, which can convert USB to a high-speed asynchronous serial port, supports automatic identification and dynamic self-adaptation of communication baud rate of 115200bps and below, and provides commonly-used MODEM contact signals to expand asynchronous serial ports for computers. It can upgrade a common serial device or MCU directly to a USB bus.


Product TypeUSB to 485
Power Supply5V
Communication Rate50bps ~ 3Mbps
Operating SystemMac OS, Linux, Windows 11 / 10 / 8.1 / 8 / 7, Android

How to Use


CDC Driver

The default driver of the computer is the CDC driver, which can be viewed through the device manager.

The software flow control is set by default. If you need to use CDC hardware flow, you need to connect the CFG of the board to EN (power-on self-test).

VCP Driver

The VCP driver is a manufacturer's driver and needs to be installed by itself. After installation, it can be viewed through Device Manager.

The default setting is software flow control. If you need to use VCP hardware flow, you can open it directly through the serial debugging assistant.


Taking RPI as an example, you can use the default driver. After connecting the device, you can use the following command to query the serial device name:

ls /dev/tty*

For example: use minicom to open UART0, then the command line input.

minicom -D /dev/ttyACM0



1. Open the APP and click Scan Device.   

2. Click the scanned device. 

3. Set the parameters to use.