I’m not sure what you’re asking, but both ports have been tried, such as 0xFF0 or 0xDFF0
Thank you for your answer. According to your instructions, should I change the connection cable first and then set the port ？
Our equipment connection line is as shown below：
As the port number mentioned before, could it be something else
Such as COM1 here。
Thank you for your reply in your busy schedule
Hi, my program error has been solved, &H is the symbol for hex in basic language, while 0x is the symbol for hex in python. I replaced &H with 0x and it worked, the port number remained the same.