Baidu search "serial debugging assistant" or "serial debugging wizard", simple installation. Click Run Serial Debugging Assistant to enter the corresponding interface. Set the interface of serial communication, baud rate parity bit and other related information. Enter the information to be sent in the Send field, and select Manual or Automatic Send. At this point, if there is no error, the other party's serial communication tool will receive the sent content. Set the relevant information of the receiving area, so that if the other party sends the information, the receiving area will receive the corresponding content. In addition, you can also send files, but the serial communication speed is too slow, and it will take a long time to transmit files, but it can be used to check the correctness of communication.