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DST110 User's Manual
4: Atmospheric Pressure – This field is not used by the DST110; therefore, it transmits a
value of 0xFFFF (65,535) for this field (which represents "data not available").
5: Reserved – This field is reserved by NMEA; therefore, the DST110 sets all bits to a
logic 1.
PGN 130311 – Environmental Parameters
The DST110 uses this PGN to provide a regular transmission of water temperature. The factory
default state of this PGN is disabled. The transmission of this PGN can be enabled (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 DST110 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: Temperature Instance – The DST110 sets this field to a value of 0x00 to indicate that
the temperature reading is a reading of sea temperature.
3: Humidity Instance – This field is not used by the DST110; therefore, it transmits a
value of 0x03 (3) for this field (which represents "data not available"),
4: Temperature – This field is used to indicate the water temperature in units of 0.01°K.
5: Humidity – This field is not used by the DST110; therefore, it transmits a value of
0x7FFF (32767) for this field (which represents "data not available").
6: Atmospheric Pressure – This field is not used by the DST110; therefore, it transmits
a value of 0xFFFF (65535) for this field (which represents "data not available").
PGN 130312 –Temperature
The DST110 uses this PGN to provide a regular transmission of water temperature. The factory
default state for this PGN is disabled. The transmission of this PGN can be enabled (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 DST110 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: Temperature Instance – The DST110 sets this field to identify a particular temperature
measurement from the source specified in Field 3. Every temperature 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: Temperature Source – This field is used to indicate the type of temperature
measurement being taken. The DST110 transmits a value of 0x00 (0) for this field,
which represents "Sea Temperature".
4: Actual Temperature – This field is used to indicate the temperature, whose source is
specified in field 2, in units of 0.01°C.
5: Set Temperature – The DST110 sets this field to a value indicating "data not
available".
6: Reserved bits – The DST110 sets all bits in this field to a value of "1".
Page A2
Appendix A – NMEA 2000
®
Interfacing
Revision 1.3
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