CH340 Driver Official Website：
https://www.wch-ic.com/downloads/ch341ser_exe.html


Serial port tools：
https://apps.microsoft.com/detail/9nblggh43hdm



Precautions: 
1. The CH340 driver must be installed first before the serial port tool can be used for debugging software. 

2. The serial port software requires the end character to be set for AT commands to respond normally. Please refer to the Serial port tool_End character setting method document for instructions on setting the end character.


