NMEA 2000 is a networking standard for marine electronics, used by most modern marine electronics hardware. It is is constructed from a a number of devices connected to a single bus, called the network backbone. All devices on the network can both transmit and receive messages.
An illustration of a typical NMEA 2000 network with some example devices is shown below.
Example NMEA 2000 Network.
Figure components are:
- N2K power cable. Every NMEA 2000 network segment must be connected to boat's 12 V power system. Ideally, the power connection should be roughly in the middle of the backbone.
- Network male and female terminators. The network backbone must be terminated with 120 ohm resistors for proper network operation. The are mandatory and essential!
- Drop cables are connected to the backbone using T-connectors. The T-connectiors can have one or multiple drop cable connections.
- Backbone cables extend the backbone. The maximum length of the network, measured from terminator to terminator, should not exceed 100 m.
- Drop cables connect individual devices to the backbone. The maximum length of the drop cable is 6 m.
- A display device such as a Multi-function Display (MFD).
- A wind sensor.
- A temperature sensor.
- An SH-wg device.
The network backbone is shown in pale blue color. All devices connect to the backbone using drop cables. Only one device can be connected to a single drop cable.
At the very minimum, the network must have a 5-way T-connector, two terminators, a power connection, and two devices with their own drop cables.
Last modified 2023-03-14: Use shortcodes for displaying images (f18c7d6)