Network Construction
The NMEA 2000 network, like the SAE J1939 network on which it is based, is organized around a bus topology, and requires a single 120Ω termination resistor at each end of the bus. (The resistors are in parallel, so a properly terminated bus should have a total resistance of 60 ohms). The maximum distance for any device from the bus is six metres.
Read more about this topic: NMEA 2000
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