Vaisala PTB220 - Manual (Page 76)

U SER ' S G UIDE _______________________________________________________________________
70 ___________________________________________________________________ M210194 EN -A
The response to the PTEST command in the serial interface consists
of the pressure reading, pressure reading corrected with defined offset
and the number of pulses to be output. See the PULSE command in
Chapter Operating modes for information on how to make the settings
of pulse output mode.
The switch SW3 may be in position ON or OFF (see Chapter
Hardware settings) when the PTEST command is being used.
Examples with output of measured pressure:
>pulse
ON
SLOW LOW 0.0
>ptest
1013.250 1013.250 10133
>pulse slow low -800
ON
SLOW LOW -800.0
>ptest
1013.250 213.250 2133
>
Examples with output of pre-defined pressure (e.g. 1000 hPa):
>pulse
ON
SLOW LOW 0.0
>ptest 1000
1000.000
1000.000 10000
>pulse slow low -800
ON
SLOW LOW -800.0
>ptest 1000
1000.000 200.000 2000
>
In case of an error, there will be no pulse output from the barometer
despite an external trigger pulse. This error handling technique
ensures that a host system cannot receive erroneous pressure readings
from a PTB220 series barometer.