![]() ![]() Some of them have designed adapters to communicate their devices with NMEA 2000® network, but not all. ![]() Many manufacturers have created their own formats of communication : Simrad (SimNet), RayMarine (SeaTalk NG), Furuno (NavNet), Garmin (GMN), Stowe (Dataline 2000), Brunswick (SmartCraft), etc. ![]() MACENC NMEA 2000 HOW TONMEA sells the standard that describes how to decode each message providing its PGN, this information is not public. The Parameter Group Number ( ³) is a number of 6 characters indicating what type of message it is, and thus how the data should be interpreted to determine the values of the data fields contained. Each packet consists of a header 8 data bits indicating the sending device, the receiver (can be all receivers)), the priority, and PGN. In the NMEA 2000® protocol, messages are sent in packets. Garmin company provides clear explanations of the connections in this video : On smaller vessels, the networks are entirely composed of "Micro" cables and connectors to which the instruments and sensors are connected. The "Mini" cable is mainly used to build a backbone for networks on large ships (generally higher than 20 meters), to which the instruments and sensors are connected with "Drop/Spur" cables.
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