Garmin GPSMAP 8X10 Installation Instructions Manual page 10

J1939 Engine Network Connection Considerations
You must use a Garmin GPSMAP J1939 accessory cable when connecting the chartplotter to the J1939 engine
network to prevent corrosion due to moisture. Using a different cable voids your warranty.
If you have an existing engine network on your boat, it should already be connected to power. Do not add any
additional power supply.
This chartplotter can connect to an engine network on your boat to read data from compatible devices such as
certain engines. The engine network follows a standard and uses proprietary messages.
You should connect only one chartplotter to one engine network. Connecting more than one chartplotter to one
engine network may result in unexpected behavior.
The port labeled J1939 is used to connect the device to the existing engine network. You must route the cable
within 6 m (20 ft.) of the engine network backbone.
The Garmin GPSMAP J1939 accessory cable requires connection to a power source and proper termination. For
more information on connecting to your engine network, see the manufacturer's engine documentation.
Pin Wire Color
Bare
Red
Black
White
Blue
NMEA 0183 Connection Considerations
®
• The chartplotter provides one Tx (transmit) port and one Rx (receive) port.
• Each 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 the NMEA 0183 device.
• You can connect one NMEA 0183 device to the Rx port to input data to this chartplotter, and you can connect
up to three NMEA 0183 devices in parallel to the Tx port to receive data output by this chartplotter.
• See the NMEA 0183 device installation instructions to identify the transmit (Tx) and receive (Rx) wires.
• You must use 28 AWG, shielded, twisted-pair wiring for extended runs of wire. Solder all connections and seal
them with heat-shrink tubing.
• Do not connect the NMEA 0183 data wires from this device to power ground.
• The power cable from the chartplotter and the NMEA 0183 devices must be connected to a common power
ground.
• The internal NMEA 0183 ports and communication protocols are configured on the chartplotter. See the
NMEA 0183 section of the chartplotter owner's manual for more information.
• See the chartplotter owner's manual for a list of the approved NMEA 0183 sentences that the chartplotter
supports.
10
NOTICE
Description
Shield
Power, positive
Power, negative
CAN High
CAN Low