Module description of USB to serial port

summary

The modules used for USB to serial port can be divided into four types according to the different hardware circuits and interfaces: S-module, T-module, R-module and C-module. See the following table for the specific differences, and the appearance photos are attached In addition, please refer to PCB data of CH340 chip for several official OEM products, such as T9T version (USB to 9-line TTL serial port), T9R version (USB to 9-line RS232 serial port), R6 version (USB to IrDA infrared serial port SIR, USB infrared adapter), etc.

This module realizes USB to asynchronous serial port, USB to IIC or I2C compatible two-wire serial port, which is used for:

Convert the original asynchronous serial port product into a quasi-USB product;

Extend more asynchronous serial ports for computers through USB bus;

Convert the data line of the original asynchronous serial port product into USB data line;

For the S-version module, the original IIC two-wire serial port product can be converted into a quasi-USB product;

For S version - module, 24CXX series memory compatible with IIC serial port can also be read and written through USB bus.