Lamp And Horn Connections; Composite Video Considerations - Garmin GPSMAP 702 series Installation Instructions Manual

Item Garmin Wire
Function
RXB
RXA
TXA
TXB
• If the NMEA 0183 device has only one input (receive, RX)
wire (no A, B, +, or -), you must leave the TXB wire
unconnected.
• If the NMEA 0183 device has only one output (transmit, TX)
wire (no A, B, +, or -), you must connect the RXB wire to
ground.
NMEA 0183 Device Connected with a Single Receive Wire
In this example, the NMEA 0183 device is receiving data from
the chartplotter.
Item Description
Power source
Power/NMEA 0183 cable
NMEA 0183 device
Item Garmin Wire Garmin Wire
Function Color
Power Red
Power ground Black
TXA Blue
TXB Gray
NMEA 0183 Device Connected with a Single Transmit Wire
In this example, the NMEA 0183 device is sending data to the
chartplotter.
Item Description
Power source
Power/NMEA 0183 cable
NMEA 0183 device
Item Garmin Wire Garmin Wire
Function Color
Power Red
Power ground Black
RXB Violet
RXA Brown
Garmin Wire NMEA 0183
Color Device Wire
Function
Violet Not applicable
Brown TX
Blue RX
Gray N/A
NMEA 0183 Device
Wire Function
Power
Power ground
RXA
Not applicable
NMEA 0183 Device
Wire Function
Power
Power ground
Not applicable
TXA
NMEA 0183 and Power Cable Pinout
Wire Function Wire Color
NMEA RXA Brown
NMEA TXA Blue
NMEA RXB Violet
NMEA TXB Gray
Alarm Yellow
Accessory on Orange
Ground (shield) Black
VIN Red

Lamp and Horn Connections

The device can be used with a lamp, a horn, or both, to sound or
flash an alert when the chartplotter displays a message. This is
optional, and the alarm wire is not necessary for the device to
function normally. When connecting the device to a lamp or
horn, observe these considerations.
• The alarm circuit switches to a low-voltage state when the
alarm sounds.
• The maximum current is 1 A, and a relay is needed to limit
the current from the chartplotter to 1 A.
• To manually toggle visual and audible alerts, you can install
single-pole, single-throw switches.
Item Description
Power source
Power cable
Horn
Lamp
Relay (1 A coil current)
Toggle switches to enable and disable lamp or horn alerts
Item Wire Color
Red
Black
Yellow

Composite Video Considerations

This chartplotter allows video input from composite video
sources using the port labeled CVBS IN. When connecting
composite video, you should observe these considerations.
• The CVBS IN port uses a BNC connector. You can use a
BNC to RCA adapter to connect a composite-video source
with RCA connectors to the CVBS IN port.
• Video is shared across the Garmin Marine Network, but it is
not shared across the NMEA 2000 network.
Pin Number
Wire Function
Power
Ground
Alarm
5