Issue
A Niagara R2 station running the ModbusAsync Service does not see any communications traffic on the designated COM port even with the "debugOn" setting enabled.
Environment
Niagara R2 all versions
Cause
The ModbusAsync Service and the ModbusAsyncNetwork were copied to an existing station from the local/remote library.
Resolution
Ensure the serviceId of the ModbusAsync Service and the serviceId of the ModbusAsyncNetwork are a match.