Key Purpose Color
2 NET-S (+12 VDC) Red
3 NET-C (- 12 VDC) Black
4 NET-H White
5 NET-L Blue
Planning and installing a network backbone
The backbone needs to run between the locations of all products to be installed - typically in
a bow to stern layout - and be no further than 6 m from a device to be connected.
Choose from the following components to make up the backbone:
• Micro-C cables: 0.6 m (2 ft), 1.8 m (6 ft), 4.5 m (15 ft), and 7.6 m (25 ft) cables.
• T-connector or 4-way connector. Used to connect a drop cable to the backbone.
• Micro-C power cable. Connect to the backbone at a position that is central to the network
load using a T-connector or 4-way connector.
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Note: When using a wind sensor, the mast cable should be connected at one end of the
backbone, as the sensor is fitted with a termination resistor.
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Note: Most NMEA 2000 devices can be connected directly to a SimNet backbone and
SimNet devices can be connected to a NMEA 2000 network by using adapter cables.
Power the network
The network requires its own 12 V DC power supply protected by a 3 amp fuse or breaker.
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.
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Note: If joining to an existing NMEA 2000 network that already has its own power
supply, do not make another power connection elsewhere in the network, and ensure
the existing network is not powered by 24 V DC.
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Note: Do not connect the NMEA 2000 power cable to the same terminals as the engine
start batteries, autopilot computer, bow thruster or other high current devices.
The following drawing demonstrates a typical small network. The backbone is made up of
directly interconnected T-connectors.
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