Airmar LB150 - Manual (Page 40)

LB150 WeatherStation Technical Manual revision 0.013
Proprietary and Confidential
PRELIMINARY - DRAFT 37
_ NMEA 0183 RECEIVED SENTENCE _
$PAMTC,
ATTOFF
Summary
A set of proprietary commands to set and query the angular attitude offsets for the
LB150 WeatherStation when mounted on a vehicle, and not necessary for
stationary instruments.
Syntax
One of the following forms:
$PAMTC,ATTOFF,SET,<3>,<4>,<5>*hh
$PAMTC,ATTOFF,Q*hh
Fields
<3> Signed azimuth offset (yaw offset), degrees, to the nearest tenth
of a degree. The value must be between -180.0 and +180.0
degrees. Negative values indicate the forward mark on the
sensor housing is oriented toward the right side of the vehicle;
positive values toward the left side.
<4> Signed pitch offset, degrees, to the nearest tenth of a degree.
The value must be between -45.0 and +45.0 degrees. Positive
values indicate the sensor is tilted forward toward the front of
the vehicle; negative values indicate the sensor is tilted toward
the back of the vehicle.
<5> Signed roll offset, degrees, to the nearest tenth of a degree. The
value must be between -45.0 and +45.0 degrees. Positive
values indicate the sensor is tilted toward the left side; negative
values toward the right side.
Notes
Note that in the NMEA 0183 command, the arguments are in degrees. The values
stored in the LB150 are in radians. Therefore, when using the
$PAMTC,ATTOFF command, there may be a slight rounding error causing the
values read back from the LB150 to be different than the commanded values by
one least significant digit.
The $PAMTC,ATTOFF,SET,<3>,<4>,<5> command is used to program the
LB150 WeatherStation with the attitude offset angles when the sensor is not
oriented parallel to the centerline, and perpendicular to the wheel base of the
vehicle. The programmed values are stored in nonvolatile EEPROM memory