Essential network information
The standardized physical cables/connectors for NMEA 2000 are
Micro-C and Mini-C, directly derived from the automation industries
‘DeviceNET’ - ‘Micro-C’ being the more commonly used size.
• While most Navico products use Micro-C cabling and
connectors, some products still use proprietary SimNet
connectors, which are easily made compatible with adaptor
cables.
• A network consists of a linear backbone from which drop-
cables connect to NMEA 2000 compliant devices.
• A single drop cable has a maximum length of 6 m (20 ft). The
total length of all drop cables combined should not exceed 78
m (256 ft).
• A NMEA 2000 network, using Micro-C cabling, has a maximum
cable length of 100 m (328 ft), between any two points.
• A NMEA 2000 network needs to have a terminator at each end
of the backbone. A terminator can be one of the following:
• A terminator blank plug.
• A wind transducer (where the mast cable is one end of the
backbone).
Planning and installing a network backbone
The Micro-C 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: 0.4 m (1.3 ft), 2 m (6,6 ft), 5 m (16.6 ft), and 9 m
(29.5 ft) cables.
• T-connector. Used to connect a drop cable to the backbone.
• Micro-C power cables. Connected to backbone using a T-
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.
Wiring | GO7 Installation Manual
19
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