Item
Garmin Wire Function
Garmin Wire Color
NMEA 0183 Device Wire Function
Ï
Transmit A (+)
Gray
Receive
Ð
Transmit B (-)
Pink
N/A
• If the NMEA 0183-compliant device has only one input (RX) wire (no A, B, +, or -), leave the pink wire unconnected.
• If the NMEA 0183-compliant device has only one output (TX) wire (no A, B, +, or -), connect the orange/white wire to ground.
• Consult the installation instructions of your NMEA 0183-compliant device to identify the output A(+) and B(-) wires and input A(+)
and B(-) wires.
• Use 28 AWG, shielded, twisted-pair wiring for extended runs of wire.
• Solder all connections and seal them with heat-shrink tubing.
Advanced NMEA 0183 Connections
There are four internal NMEA 0183 input ports (RX ports), and two internal NMEA 0183 output (TX ports) on the included NMEA
0183 data cable. You can connect one NMEA 0183 device per internal RX port to input data to your Garmin device, and you can
connect up to three NMEA 0183 devices in parallel to each internal TX port to receive data output by your Garmin device. Each
internal RX and TX port has 2 wires, labeled A (+) and B (-) according to the NMEA 0183 convention. The corresponding A (+) and
B (-) wires of each internal port should be connected to the A (+) and B (-) wires of your NMEA 0183-compliant device. Refer to the
table and wiring diagrams when connecting the data cable to NMEA 0183 devices.
Consult the installation instructions for your NMEA 0183-compliant device to identify the output (TX) A (+) and B (-) wires and input
(RX) A (+) and B (-) wires. Use 28 AWG, shielded, twisted-pair wiring for extended runs of wire. Solder all connections and seal
them with heat-shrink tubing.
• For two-way communication with a NMEA 0183 device, the internal ports on the NMEA 0183 data cable are not linked. For
example, if the input of the NMEA-compliant device is connected to the internal output port 1 on the data cable, you can connect
the output port of your NMEA 0183-compliant device to any of the internal input ports (port 1, port 2, port 3, or port 4) on the
wiring harness.
• The ground wires on the NMEA 0183 data cable and your NMEA 0183-compliant device must both be connected to ground.
• See
for a list of the approved NMEA 0183 sentences output by and input to your device.
• The internal NMEA 0183 ports and communication protocols are configured on the connected Garmin device. See the NMEA
0183 section or communication configuration section of the owner's manual provided with your Garmin device for more
information.
Port
Wire Function
Wire Color
Pin Number
Input port 1
RX/A (+)
White
RX/B (-)
Orange/white
Input port 2
RX/A (+)
Brown
RX/B (-)
Brown/white
Input port 3
RX/A (+)
Violet
RX/B (-)
Violet/white
Input port 4
RX/A (+)
Black/white
RX/B (-)
Red/white
Output port 1
TX/A (+)
Gray
TX/B (-)
Pink
Output port 2
TX/A (+)
Blue
TX/B (-)
Blue/white
N/A
Spare
N/A
N/A
Spare
N/A
N/A
Spare
N/A
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