Only One Receiving Wire
If your NMEA 0183 compatible device has only one receiving wire (Rx), you must connect it to the blue wire
(Tx/A) from the helm control, and leave the white wire (Tx/B) from the helm control unconnected.
NMEA 2000 network (provides power to the helm control)
12 Vdc power source
Helm control
NMEA 0183 compatible device
Wire
Helm Control Wire Color — Function
NMEA 0183 Compatible Device Wire Function
N/A
Power
N/A
NMEA 0183 ground
Blue — Tx/A (+)
Rx
White — unconnected
N/A
Brown — Rx/A (+)
Tx/A (+)
Green — Rx/B (-)
Tx/B (-)
NOTE: When connecting a NMEA 0183 device with only one receiving (Rx) line, you must connect the NMEA
2000 bus and the NMEA 0183 device to a common ground.
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