How does NMEA 2000 network work?
What is NMEA 2000?
NMEA 2000 is a plug-and-play communication standard for connecting marine instruments within ships. The plug-and-play interface allows devices made by different manufacturers to communicate with each other within the same network without causing interference between devices.
The National Marine Electronics Association (NMEA) was founded in 1957 to facilitate cooperation among manufacturers of electronic equipment. It does this by establishing a communication standard for electronics in marine vehicles. NMEA developed the standard NMEA 0183 and its successor standard NMEA 2000. These standards enable devices from different manufacturers to integrate seamlessly with each other.
How does NMEA 2000 work?
NMEA 2000, often shortened to NMEA2K or N2K, uses Controller Area Network (CAN) technology originally designed for the automotive industry. NMEA 2000 builds on the SAE J1939 high-level protocol, but uses its own messaging scheme. However, NMEA 2000 devices and J1939 devices can operate on the same physical network.
NMEA 2000 is an updated version of the NMEA 0183 serial data bus standard. NMEA 2000 has a significantly higher data rate (250k bits/s vs. 4800 bits/s) compared to NMEA 0183. It also uses a compact binary message format rather than the ASCII serial communication protocol. In addition, NMEA 2000 supports the specification of multi-talker, multi-listener data networks. This listener data network is more advanced than the single-talker, multiple-listener (simplex) serial communication protocol used by NMEA 0183. As a result, NMEA 2000 provides better performance and more reliable communications for marine vessels.
Using NMEA 2000, the display unit can display multiple sources of information simultaneously. This means that different instruments can work together without conflict. Even in the event of a single unit failing or becoming unresponsive, the rest of the network can still function and share information.
NMEA 2000 networks run on 12 volts DC. A connector with positive and ground wires, including an inline fuse for the positive wire, provides onboard power to the network backbone. These power cables should be connected near the backbone center to ensure proper system operation.
Premier Cable has been designing and manufacturing sensors and cables for the marine industry for over 20 years. We offer a multitude of NMEA 2000 products to fit your needs.
If you have any questions about NMEA 2000 or any of our other products, leave you messages or contact us today. A member of our team will be happy to work with you to find the best solutions for your boat.
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