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Revision 1.2 Appendix A – NMEA 2000
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Interfacing Page A1
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Appendix A – NMEA 2000
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Interfacing
TLM150 NMEA 2000
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Periodic Data Transmitted PGNs
PGN 127505 – Fluid Level
The TLM150 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 TLM150
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. The TLM150 ships from the factory with a fixed 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 TLM150 ships from the
factory with a default value of 0xFFFFFFFF indicating “Data Not Available”.
5: Reserved – This field is reserved by NMEA; therefore, the TLM150 sets all bits to a
logic 1.