Oceanic Systems J1939 to NMEA2000 Adapter - 3185Oceanic Systems J1939 to NMEA2000 Adapter 3185. The Oceanic Systems3185 J1939 to NMEA2000 Adaptor takes standard J1939 engine and transmission messages and transmits them onto the NMEA2000 network. The J1939 interface is optically isolated to prevent ground loop problems and is read only so no messages are sent to the J1939 interface for absolute safety. The Adaptor is equipped with LEDs to indicate when J1939 messages are received and when
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