Airmar PB200 - Manual (Page 9)

PB200 WeatherStation User Manual revision 1.000
Proprietary and Confidential
3
Destination: Global or Address. A Global Destination means that the parameter group
was designed to be broadcast for use by all receiving devices on the bus. If Destination =
Address, this means the parameter group was designed to be transmitted to a specific
device on the bus. In this case, the address of the destination device must be provided
within the PGN.
Query Support: If the parameter group supports queries, then the PB200 will transmit
the parameter group if requested by another device on the bus. The request must be made
using either the ISO Request PGN 59904, or the Complex Request Group PGN 126208.
Access Level: The PB200 contains a security mechanism whereby certain PGNs require
an access sequence to be performed in order to enable the functionality in the PGN. If
the indicated Access Level is 0, then the PGN is fully functional without requiring an
access sequence to be performed. If the indicated Access Level is nonzero, then it is
necessary to perform an access sequence using the proprietary transmitted PGN 065287,
Access Level, before the functionality of the PGN will be enabled.
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.