Airmar PB200 - Manual (Page 24)

PB200 WeatherStation User Manual revision 1.000
Proprietary and Confidential
18
NMEA 2000® TRANSMITTED PARAMETER GROUP
PGN
126720-32
(0x1EF00)
Proprietary: Attitude Offsets
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 32 (decimal) 32 = Attitude Offsets
5 Azimuth offset No N/A DF04 int16 0.0001 rad - to + rad
Default value = 0 rad.
Negative values indicate the forward mark on
the sensor housing is oriented toward the
starboard side of the vessel; positive values
toward the port side. Value stored in EEPROM.
6 Pitch offset No N/A DF04 int16 0.0001 rad - /4 to + /4 rad
Default value = 0 rad.
Positive values indicate the sensor is tilted
forward toward the bow; negative values
indicate the sensor is tilted aftward. Value
stored in EEPROM.
7 Roll offset No N/A DF04 int16 0.0001 rad - /4 to + /4 rad
Default value = 0 rad.
Positive values indicate the sensor is tilted
toward the port side; negative values toard the
starboard side. Value stored in EEPROM.
Notes
This PGN is transmitted in response to a PGN 126208 Request Group Function message. Fields 1, 3, and 4 must each be fully specified in the request in order for this PGN to be
transmitted.
This PGN does not respond to ISO Requests (PGN 59904).
This PGN performs the same function in the PB200 as the NMEA 0183 proprietary command, $PAMTC,ATTOFF. Note that in the NMEA 0183 command, the arguments are in
degrees, while in the NMEA 2000® PGN, the arguments are in radians. The values are stored in the PB200 in radians.
This PGN is used to program the PB200 WeatherStation with the attitude offset angles when the sensor is not oriented parallel to the centerline, and perpendicular to the deck of
the vessel. The programmed values are stored in nonvolatile EEPROM memory within the WeatherStation, and so remain programmed even after cycling power.
The azimuth offset angle is used by the PB200 to adjust the apparent wind angle relative to the bow of the vessel, and the vessel’s heading measured by the internal compass.
These values are further used in calculating the true wind speed and angle.