Lamp Or Horn Connections - Garmin GPSMAP 8400 series Installation Instructions Manual

Item Garmin Wire
Function
TxA (+)
TxB (-)
• If the NMEA 0183 device has only one input (receive, Rx)
wire (no A, B, +, or -), you must leave the pink wire
unconnected.
• If the NMEA 0183 device has only one output (transmit, Tx)
wire (no A, B, +, or -), you must connect the orange/white
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 cable
NMEA 0183 device
NMEA 0183 cable
Item Garmin Wire
Function
Power
Power ground
Data ground
TxA (+)
TxB (-)
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 cable
NMEA 0183 device
NMEA 0183 cable
Item Garmin Wire
Function
Power
Power ground
Data ground
RxB (-)
RxA (+)
Garmin Wire NMEA 0183
Color Device Wire
Function
Gray Rx
Pink N/A
Garmin Wire NMEA 0183 Device
Color Wire Function
Red Power
Black Power ground
Black Data ground
Gray RxA
Pink N/A
Garmin Wire NMEA 0183 Device
Color Wire Function
Red Power
Black Power ground
Black Data ground
Orange/white N/A
White TxA (+)
NMEA 0183 Pinout
Port Wire Function
Input port 1 RX/A (+)
RX/B (-)
Input port 2 RX/A (+)
RX/B (-)
Input port 3 RX/A (+)
RX/B (-)
Input port 4 RX/A (+)
RX/B (-)
Output port 1 TX/A (+)
TX/B (-)
Output port 2 TX/A (+)
TX/B (-)
N/A Garmin GPS in (unused)
N/A Garmin GPS out (unused) Green
N/A Alarm
N/A Accessory on
N/A Ground (shield)
N/A Spare
N/A Spare

Lamp or 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 100 mA, and a relay is needed to
limit the current from the chartplotter to 100 mA.
• To toggle visual and audible alerts manually, you can install
single-pole, single-throw switches.
Item Description
Power source
Power cable
Horn
Wire Color Pin Number
White
Orange/white
Brown
Brown/white
Violet
Violet/white
Black/white
Red/white
Gray
Pink
Blue
Blue/white
White/Green
Yellow
Orange
Black
N/A
N/A
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