Garmin GPSMAP 902 series Manuale di istruzioni per l'installazione - Pagina 4
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NMEA 2000 network. If you do not have an existing NMEA 2000
network you can create a basic one using cables from Garmin.
If you are unfamiliar with NMEA 2000, you should read the
"NMEA 2000 Network Fundamentals" chapter of the Technical
Reference for NMEA 2000 Products. You can find this document
using the "Manuals" link on the product page for your device at
www.garmin.com.
The port labeled NMEA 2000 is used to connect the device to a
standard NMEA 2000 network.
Item
Description
NMEA 2000 compatible Garmin device
GPS antenna
Ignition or in-line switch
NMEA 2000 power cable
NMEA 2000 drop cable
12 Vdc power source
NMEA 2000 terminator or backbone cable
NMEA 2000 T-connector
NMEA 2000 terminator or backbone cable
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.
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
4
communication. To receive information from a NMEA 0183
device, refer to items
,
Garmin device. To transmit information to a NMEA 0183 device,
refer to items
,
,
, and
device.
Item
Description
Power source
Power/NMEA 0183 cable
NMEA 0183 device
Item
Garmin Wire
Function
Power
Power ground
Not applicable
RXA
RXB
TXA
TXB
Single-Ended NMEA 0183 Device Connections
Item
Description
Power source
Power/NMEA 0183 cable
NMEA 0183 device
Item
Garmin Wire
Function
Power
Power ground
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.
,
, and
when connecting the
when connecting the Garmin
Garmin Wire
NMEA 0183
Color
Device Wire
Function
Red
Power
Black
Power ground
Not applicable
Data ground
Brown
TXA
Violet
TXB
Blue
RXA
Gray
RXB
Garmin Wire
NMEA 0183
Color
Device Wire
Function
Red
Power
Black
Power ground
Violet
Not applicable
Brown
TX
Blue
RX
Gray
N/A