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Appendix A – NMEA 2000® Interfacing
FPM100 NMEA 2000® Periodic Data Transmitted PGNs
PGN 130314 – Actual Pressure
The FPM100 uses this PGN to provide a regular transmission of various pressures. The factory default for periodic transmission rate is once every two seconds. The transmission of this PGN can be disabled (see PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate).
Field 1:SID – The sequence identifier field is used to tie related PGNs together. For example, the FPM100 will transmit identical SIDs for 130312 (Temperature) and 130311 (Environmental Parameters) to indicate that the readings are linked together (i.e., the data from each PGN was taken at the same time although they are reported at slightly different times).
2:Pressure Instance – The FPM100 sets this field to identify a particular pressure measurement from the source specified in Field 3. Every pressure measurement from a given source type on the network should have a distinct instance value, so that monitoring devices and displays can identify which measurement is which.
3:Pressure Source – This field is used to indicate the type of pressure measurement being taken. Possible values for this field include Atmospheric Pressure, Water Pressure, Steam Pressure, Compressed Air Pressure, Hydraulic Pressure, and 16 User Defined pressure sources.
4:Pressure – This field is used to indicate the pressure, whose source is specified in field 2, in units of 0.1 Pa.
6:Reserved bits – The FPM100 sets all bits in this field to a value of “1”.
PGN 127505 – Fluid Level
The FPM100 uses this PGN to indicate the attached tank’s fluid instance, fluid type, fluid level, and tank capacity.
Field 1: Fluid Instance – This field is used to identify the tank number and ranges between 0 and 15. There can be up to 16 tanks of a given type as defined by the Fluid Type field. This field is programmable through the NMEA command PGN. The FPM100 ships from the factory with a default value of zero.
2:Fluid Type – This field identifies the type of fluid contained within the tank. Currently the defined fluid types are fuel, fresh water, wastewater, live well, oil, and black water. This field is programmable through the NMEA command PGN. The FPM100 ships from the factory with a default value of 0x0 indicating “Fuel”.
3:Fluid Level – This field is used to indicate the current fluid level in percentage. The value transmitted in this field depends on the distance from the sender to the top of the fluid or tank bottom.
4:Tank Capacity – This field is used to indicate the tank capacity. This field is programmable through the NMEA command PGN. The FPM100 ships from the factory with a default value of 0xFFFFFFFF indicating “Data Not Available”.
5:Reserved – This field is reserved by NMEA; therefore, the FPM100 sets all bits to a logic 1.
Revision 1.3 | Appendix A – NMEA 2000® Interfacing | Page A1 |
