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Revision 1.0 Appendix A – NMEA 2000 Interfacing Page B1
Appendix A – NMEA 2000
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Interfacing
J2K100 NMEA 2000
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Periodic Data Transmitted PGNs
PGN 127488 – Engine Parameters, Rapid Update
The J2K100 uses this PGN to transmit rapidly changing engine data.
Field 1: Engine Instance – This field indicates the particular engine for which this data
applies. A single engine will have an instance of 0. Engines in multi-engine boats will
be numbered starting at 0 at the bow of the boat incrementing to n going in towards
the stern of the boat. For engines at the same distance from the bow are stern, the
engines are numbered starting from the port side and proceeding towards the
starboard side.
2: Engine Speed – This field indicates the rotational speed of the engine in units of ¼
RPM.
3: Engine Boost Pressure – This field indicates the turbocharger boost pressure in units
of 100 Pa.
4: Engine tilt/trim – This field indicates the tilt or trim (positive or negative) of the engine
in units of 1 percent.
5: Reserved – This field is reserved by NMEA; therefore, the J2K100 sets all bits to a
logic 1.
PGN 127489 – Engine Parameters, Dynamic
The J2K100 uses this PGN to transmit more slowly changing engine data.
Field 1: Engine Instance – This field indicates the particular engine for which this data
applies. A single engine will have an instance of 0. Engines in multi-engine boats will
be numbered starting at 0 at the bow of the boat incrementing to n going in towards
the stern of the boat. For engines at the same distance from the bow are stern, the
engines are numbered starting from the port side and proceeding towards the
starboard side.
2: Engine Oil Pressure – This field indicates the oil pressure of the engine in units of
100 Pa.
3: Engine Oil Temperature – This field indicates the oil temperature of the engine in
units of 0.1°K.
4: Engine Temperature – This field indicates the temperature of the engine coolant in
units of 0.1°K.
5: Alternator Potential – This field indicates the alternator voltage in units of 0.01V.
6: Fuel Rate – This field indicates the fuel consumption rate of the engine in units of
0.0001 cubic meters / hour.
7: Total Engine Hours – This field indicates the cumulative runtime of the engine in units
of 1 second.
8: Engine Coolant Pressure – This field indicates the pressure of the engine coolant in
units of 100 Pa.