1
modbus ILLEGAL_FUNCTION
The function code in the request is not recognised or is not allowed by the server. This may indicate the server has not implemented the requested function, or is not in a state that allows it.
Numeric value: 1
The function code in the request is not recognised or is not allowed by the server. This may indicate the server has not implemented the requested function, or is not in a state that allows it.
Numeric value: 1