Plan and install an NMEA 2000 network
An NMEA 2000 network consists of a powered backbone from which drop cables connect to
NMEA 2000 devices. The backbone needs to run within 6 m (20 ft) of the locations of all
products to be connected, typically in a bow to stern layout.
The following guidelines apply:
• The total length of the backbone should not exceed 100 meters (328 ft).
• A single drop cable has a maximum length of 6 meters (20 ft). The total length of all drop
cables combined should not exceed 78 meters (256 ft).
• A terminator must be installed at each end of the backbone. The terminator can be a
terminator plug or a unit with built-in terminator.
A NMEA 2000 device
B Drop-cable
C Terminator
D Power supply
E Backbone
Powering the NMEA 2000 network
The network requires its own 12 V DC power supply, protected by a 3 amp fuse.
For smaller systems: connect power at any location in the backbone.
For larger systems: connect power at a central point in the backbone to balance the voltage
drop of the network. Make the installation such that the load/current draw on each side of
the power node is equal.
Ú
Note: 1 LEN (Load Equivalency Number) equals 50 mA current draw.
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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.
Serial port
The serial port(s) is used for NMEA 0183 and touch screen control.
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Wiring | NSO evo3S MPU Installation Manual
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