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NMEA 2000 / SimNet | NSS Installation Manual
Power the network
A NMEA 2000 network requires its own 12 V DC power supply protected by a 5 amp fuse or
breaker. For 24 V systems, use a DC-DC converter to supply 12 V
Connect power at any location in the backbone for smaller systems.
For larger systems introduce power at central point in the backbone to “balance” the voltage
drop of the network.
¼ Note: If joining to an existing NMEA 2000 network or similar CAN bus network that already
has it’s own power supply, do not make another power connection.
¼ Note: Do not connect the NMEA 2000 power cable to the same terminals as the start batter-
ies, Autopilot Computer, Radar, thruster or other high current devices.
The drawing below demonstrates a typical small network. The backbone
is entirely made up of T-piece joiners, which are terminated at each end.
12 V DC
T T
-
+
T
Micro-C
Power
Terminator
In the larger system below, the backbone is extended by cable and is also daisy chained
through Triton displays.
+
_
12 V DC
1
5
4
3
2
6
6 SimNet power source. Stable 12 V DC only
7 5 Amp fuse or breaker
8 Switch
9 SimNet power cable with termination (red disc) (24005902)
10 SimNet 7 way joiner
11 SimNet or NMEA 2000 GPS antenna
12 SimNet backbone daisy chained using instruments with two SimNet ports.
13 SimNet backbone
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