Airmar NMEA 2000® Depth, Датчики - Manual (Page 5)

DST200 User Manual revision 1.000
Proprietary and Confidential
3
Request Parameter: A "Yes" value specifies that the given field may be used by the
Request Group Function PGN 126208 as a qualifier to request specific data according to
the contents of the field.
DD: Data Dictionary. The Data Dictionary number defines the contents of the parameter
group field. The designators in this column are described in detail in the NMEA 2000®
Standard, Appendix B.2.
DF: Data Format. The Data Format number defines the format of the data in the
parameter group field. The designators in this column are described in detail in the
NMEA 2000® Standard, Appendix B.3.
Type: The Type designators are described in detail in the NMEA 2000® Standard,
Appendix B.4.
Resolution: The resolution indicates the smallest increment of the value in the given
field, in the units specified by the data format.
Value: This indicates the range of allowable values the field may contain.
2.2. Sequence ID (SID)
Some transmitted Parameter Groups contain a SID (Sequence Identification Number)
field. This field contains an 8-bit upward counting number that is used to tie related
information together between different Parameter Groups. The SID provides a method to
indicate that the data in a given set of Parameter Groups are synchronized to the same
sample interval.
In the DST products, the following groups of PGNs will contain identical SID values,
indicating that the data from each PGN in the group was taken at the same time, even
though the PGNs may be transmitted at different times:
SID Group 1:
PGN 128267 Water Depth
Proprietary PGN 65408 Depth Quality Factor
SID Group 2:
PGN 128259 Speed
Proprietary PGN 65409 Speed Pulse Count