Can a J1939 Engine be Connected to the NMEA 2000 Network

J1939 Communication primary use

Some marine engine manufacturers utilize the J1939 protocol to communicate via the CAN system. J1939 and NMEA 2000 use the same message formats but sending that data differs. J1939 manufacturers "hard code" the node address for each product connected to a network. NMEA 2000 is considered a "plug-and-play" system that assigns node addresses automatically when connected to the NMEA 2000 network. NMEA 2000 is a more straightforward method of installation between various marine devices. J1939 engines are more likely to be found on larger vessels or commercially used ships, i.e., commercial fishing boats, tugs, ferries, cruise ships where engine data is critical information for the vessel's operation. J1939 engines often have gateways that allow connection to the NMEA 2000 network, but if the engine is a J1939, some proprietary sentences are not read via the NMEA 2000 network. 

A couple of engine manufacturers found in pleasure crafts that use the J1939 interface, like Yamaha and the Volvo Penta. Garmin makes a line of GPSMAP units with the J1939 port that allows for engine data to be shared with the Garmin Chartplotter. 

Considerations

• J1939 engines will require a specialized cable from the engine manufacturer

• J1939 also requires professional installation by an authorized installer for J1939. The end-user does not install it

• J1939 engines can connect to the NMEA 2000 network but require a gateway that the engine manufacturer sells. Some proprietary engine sentences will not transmit via NMEA 2000

• The Yamaha gauge page will display when an engine is connected to the J1939 port on the GPSMAP unit