Maretron TMP100 User Manual page 19

Appendix A – NMEA 2000
TMP100 NMEA 2000
PGN 130310 – Environmental Parameters (not recommended for new designs; included
for backward compatibility)
The TMP100 uses this PGN to provide a regular transmission of water temperature and
outside air temperature. The factory default for periodic transmission rate is twice per second.
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 TMP100 will transmit identical SIDs for 130310 (Environmental
Parameters) and 130312 (Temperature) 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: Water Temperature – This field is used to indicate water temperature in units of
0.01°C.
3: Outside Ambient Air Temperature – This field is used to indicate the outside ambient
air temperature in units of 0.01°C.
4: Atmospheric Pressure – This field is filled by the TMP100 with a value indicating "data
not available".
5: Reserved bits – The TMP100 sets all bits in this field to a value of "1".
PGN 130311 – Environmental Parameters (not recommended for new designs; included
for backward compatibility)
The TMP100 uses this PGN to provide a regular transmission of outside temperature, relative
humidity, and atmospheric pressure. The factory default for periodic transmission rate is twice
per second. 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 TMP100 will transmit identical SIDs for 130311 (Environmental
Parameters) and 130312 (Temperature) 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: Temperature Instance – The TMP100 sets this field to indicate the type of
temperature reading. The value of this field depends on the setting of the
temperature source for each channel. This value can be any of Sea Temperature,
Outside Temperature, Inside Temperature, Engine Room Temperature, or Main
Cabin Temperature.
3: Humidity Instance – The TMP100 sets this field to a value indicating "data not
available".
4: Temperature – This field is used to indicate the temperature, whose source is
specified in field 2, in units of 0.01°C.
5: Humidity – The TMP100 sets this field to a value indicating "data not available".
6: Atmospheric Pressure – The TMP100 sets this field to a value indicating "data not
available".
Revision 1.2
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Periodic Data Transmitted PGNs
Appendix A – NMEA 2000 Interfacing
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Interfacing
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