Garmin GPSMAP 12 2 Series Installation Instructions Manual page 10

NMEA 0183 Device Connections
This diagram illustrates two-way connections for both sending and receiving data. You can also use this
diagram for one-way communication. To receive information from a NMEA 0183 device, refer to items
, , and when connecting the Garmin device. To transmit information to a NMEA 0183 device, refer to
items , , , , and
Item Description
Power source
Power/NMEA 0183 cable
NMEA 0183 device
Item Garmin Wire Function
Power
Power ground
Data ground
Rx/A (In +)
Rx/B (In -)
Tx/A (Out +)
Tx/B (Out -)
If the NMEA 0183 device has only one input (receive, Rx) wire (no A, B, +, or -), you must leave the gray wire
unconnected.
If the NMEA 0183 device has only one output (transmit, Tx) wire (no A, B, +, or -), you must connect the violet
wire to ground.
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when connecting the Garmin device.
Garmin Wire Color
Red
Black
Black
Brown
Violet
Blue
Gray
NMEA 0183 Device Wire Function
Power
Power ground
Data ground
Tx/A (Out +)
Tx/B (Out -)
Rx/A (In +)
Rx/B (In -)
, ,