change to E80 from C120

[Chuck - Raymarine - Moderator]

Don,

You're MFD's SeaTalk communications interface was proven operational in that it supports communications with the system's other devices when the RS125 GPS Sensor is removed from the SeaTalk bus. As suggested within my earlier response, it sounds as though the RS125 may have suffered a failure of its SeaTalk communications circuitry. Generally, such failures would simply result in cessation of communications within the SeaTalk bus. You may want to consider performing a Factory Reset Operation to the MFD to overcome the reported issue. Should this fail to correct the problem, then it is recommended that the GPS sensor be replaced with a Raystar 150 GPS Sensor or that you try interfacing it via NMEA 0183 to the MFD's NMEA 0183 Cable.