Garmin GPSMAP 741 Guide Manuel d'instructions d'installation - Page 4

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Garmin GPSMAP 741 Guide Manuel d'instructions d'installation
Item
Description
12 Vdc power source
Wiring harness
NMEA 0183-compliant device
Item
Garmin Wire
Function
Power
Ground
Tx
Rx
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
Item Description
10–35 Vdc power source
Power cable
Horn
Lamp
Relay (100 mA coil current)
Toggle switches to enable and disable lamp or horn alerts
Item
Wire Color
Red
Black
Yellow
4
+
>
>
Garmin Wire
NMEA 0183
Color
Device Wire
Function
Red
Power
Black
Data ground
Blue
Rx/A (+)
Brown
Tx/A (+)
Wire Function
Power
Ground
Alarm
-
>
>
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 manually toggle visual and audible alerts, you can install
single-pole, single-throw switches.

NMEA 2000 Considerations

If you have an existing NMEA 2000 network on your boat, it
should already be connected to power. Do not connect the
included NMEA 2000 power cable to an existing NMEA 2000
network, because only one power source should be connected
to a NMEA 2000 network.
If you are installing the included NMEA 2000 power cable, you
must connect it to the boat ignition switch or through another in-
line switch. NMEA 2000 devices will drain your battery if the
NMEA 2000 power cable is connected to the battery directly.
NMEA 2000 compatible models can connect to a NMEA 2000
network on your boat to share data from NMEA 2000
compatible devices such as a VHF radio. The necessary NMEA
2000 cables and connectors are sold separately.
NOTICE