
Brief NMEA2000
The marine electronics industry utilized CAN as the basis to develop the bi-directional
multi-transmitter/multi-receiver instrument network to interconnect marine electronic
devices, NMEA 2000.
In collaboration with IEC TC 80 Working Group 6, the NMEA 2000 Standards Committee
and Working Group 6 jointly developed IEC 61162-3 which references the National
Marine Electronics Association’s NMEA 2000 with specific rules for SOLAS Class Vessels
The NMEA 2000 network allows multiple electronic devices to be connected together on
a common channel for the purpose of easily sharing information. Because it is a
network, and because multiple devices can transmit data, a more comprehensive set of
rules is required that dictate the behavior of the members of the network. CAN
automatically provides some of these rules – mostly for control of access to the
network, packet transmission, and error detection.
The maximum length of the network is controlled by the CAN requirement that all nodes
on the network sample the same bit at the same time. Theoretically this translates to
the following:
• 1,000 kbits/second - 25 meters
• 500 kbits/second - 75 meters
• 250 kbits/second - 200 meters – NMEA 2000 Standard
• 125 kbits/second - 500 meters
• 62.5 kbits/second - 1100 meters
WHY NMEA 2000,
Because is :
1. Easy to install and to maintain
2. Less expensive to install and can fit very constraint condition
3. Robust equipment
4. Very easy to expand ,add new equipment
5. Easy to monitor and to debug
6. Is SOLAS approved
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