Only One Transmitting Wire
If your NMEA 0183 compatible device has only one transmitting wire (Tx), it must be connected to the brown
wire (Rx/A) from the helm control, and the green wire (Rx/B) from the helm control must be connected to NMEA
0183 ground.
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
Green — Rx/B (-) (connect to NMEA 0183 ground)
NMEA 0183 ground
Blue — Tx/A (+)
Rx/A (+)
White — Tx/B (-)
Rx/B (-)
Brown — Rx/A (+)
Tx/A (+)
NOTE: When connecting a NMEA 0183 device with only one transmitting (Tx) line, you must connect the NMEA
2000 bus and the NMEA 0183 device to a common ground.
23