Are you sure you have an ME-AGS-N? The -N didn't come out until 2008. The original ME-AGS has 5 knobs for adjustments and all the settings are done from there not in the remote. The -N does not have any knobs as all the adjustments are made from the remote.
I am thinking the remote may have been replaced with a newer version that can communicate to a -N model but the old ME-AGS is still connected so it will display "no comm".
If you can start the gen from the test menu in the ME-RC then it is sending data but may not be able to receive.
Use the TECH button and check the rev of the remote. If it is v1.6 or higher it was most likely changed from the original in 2005.
Gary