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3.2 Check port number
Right click my computer\management\Device manager\Port （ COM&LPT ） . You can see
the generated port number, the port number is COM3.
Change port number
Sometimes we will insert multiple USB serial ports into the computer. Sometimes we want
the serial port number to be assigned in the way we expected, so we need to manually adjust the
serial port number. For example, change the serial port 16 above to a serial port. The steps are as
follows:
Open the device manager, right click on the USB-SERIAL CH340 and select Attribute