Airmar LB150 - Manual (Page 59)

LB150 WeatherStation Technical Manual revision 0.013
Proprietary and Confidential
PRELIMINARY - DRAFT 56
_ NMEA 0183 RECEIVED SENTENCE _
$PAMTC,
HEATER
Summary
Control the internal heater within the weather station.
Syntax
One of the following forms:
$PAMTC,HEATER,0*hh<CR><LF>
Turn heater off (default state).
$PAMTC,HEATER,A*hh<CR><LF> Control heater automatically.
$PAMTC,HEATER,Q*hh<CR><LF> Query heater status, and start
reporting subsequent changes in
status
$PAMTC,HEATER,X*hh<CR><LF> Stop reporting heater status change
Notes
The heater may be used in the weather station to prevent the formation of dew or
ice on the aluminum plate in the wind channel. If the heater control is set to "A"
(automatic control), then the weather station will automatically cycle the heater on
and off over time to keep the plate temperature within appropriate limits based on
the air temperature (and dew point temperature, if product has humidity sensor,
PBxxx products do not, LBxxx products do).
If a $PAMTC,HEATER,Q (Query) command is received, then every time the
heater status changes, the sensor will transmit the following message:
$PAMTR,HEATER,<1>,<2>,<3>*hh<CR><LF>
where
<1> = Heater mode (M = manual, A = automatic)
<2> = Heater state (0 = heater Off, 1 = heater On)
<2> = Heater control (V = Valid, if Factory enabled, else NULL)
Heater status change reporting may be disabled with the $PAMTC,HEATER,X
command.
Note that when the heater is on, the air temperature sensor within the unit will be
heated by the heater and will not provide an accurate indication of outside
ambient air temperature.
This is a factory enabled option that is not present by default.