Airmar NMEA 2000® Depth, Датчики - Manual (Page 40)

DST200 User Manual revision 1.000
Proprietary and Confidential
38
NMEA 2000® TRANSMITTED PARAMETER GROUP
PGN
126720-46
(0x1EF00)
Proprietary: NMEA 2000® Options
Single Frame: No Priority: 7/Y/N Update Rate: 0/N/N Destination: Address Query Support: Yes Access Level: 0
Field
#
Name
Request
Param. DD
DF Type Resolution Value Remark
1 Manufacturer Code Yes DD172 DF52 11 bits 1 135 (decimal) Manufacturer Code for Airmar Technology.
2 Reserved bits No DD001 DF52 2 bits 1 0x3 All bits set to logic "1"
3 Industry Group Yes DD168 DF52 3 bits 1 4 (decimal) Industry Group for "Marine Industry".
4 Proprietary ID (PID) Yes DD005 DF53 uint8 1 bit 46 (decimal) 46 = NMEA 2000® Options
5 Transmission Interval Supersedes Measurement
Interval
No DD003 DF52 2 bits 1 MSB/LSB:
00 = Feature Disabled
01 = Feature Enabled
10 = Reserved
11 = No action/Data Not
Available
See the text below for a description of this
feature.
This field may be changed with the Command
Group Function PGN 126208. It is saved in
EEPROM. The default value is 00 (Feature
Disabled).
6 Reserved bits No DD001 DF52 22 bits 1 0x3FFFFF All bits set to logic "1"
Notes
The various types of data provided by the DST200 are sampled, or measured, at different rates, depending on the nature of the data being measured. For example, the rate at which
the digital depth is transmitted may depend on how long it takes for a sonar echo to return from the sea bottom. The rate at which a given source of data is measured is unrelated to
the rate at which its corresponding PGN is transmitted. It is possible, using the Request Group Function PGN 126208, to specify a PGN transmission interval that is faster than the
corresponding measurement interval for data within the PGN.
Field 5 of this PGN allows the user to specify the behavior of the unit when PGNs are requested to be transmitted faster than the measurement intervals for data within the PGNs.
If the feature is disabled (the default case), then the measurement interval supersedes the requested transmission interval. If the feature is enabled, then the requested transmission
interval supersedes the measurement interval.
Some examples are shown below: