The serial port can't be opened when in use, and then just restart the computer and the instrument connected with the serial port.

As long as the instrument can send data, it can be judged that the instrument is fine, the computer can receive data, the computer serial port should be fine, and the data cable can test the path.

Occasionally, it can't be opened, which may be caused by the instability of serial port transmission data. Generally, the data line from USB to serial port is prone to this situation. It is recommended to uninstall the serial port driver and reinstall it.

Thern Weighing Software hopes to help you.