Troubleshooting 'pymodbus.exceptions.ModbusIOException: Modbus Error: [Input/Output] Unable to decode request' in Python

This error message indicates that there was an issue decoding a Modbus request. It could be due to a problem with the communication between the Modbus client and server, or a problem with the request itself.

To troubleshoot this issue, you can start by checking the Modbus communication settings, such as the port number, baud rate, and parity settings. You can also check the Modbus request to ensure that it is properly formatted and contains the correct data.

If you are using a third-party Modbus library, you can also check the documentation or reach out to their support team for further assistance.