CAGB : Communication Error Modbus Gateway

The number on the end of the error code refers to which module is having the issue. A-F represents numbers above 9. For example CAG#.

System does not detect a Modbus CGM that was registered as being connected at power up.

The Modbus CGM address dial was changed while the system was powered up

Unplug the Modbus CGM from the CAN network and re-plug it back in so that it re-registers with the new address.

The Modbus CGM is not connected/failed

Check that the Modbus CGM is properly connected to the CAN network and it's LEDs indicate it is powered.