Vaisala PTB220 - Manual (Page 91)

A PPENDIX D ____________________________________________________ PULSE OUTPUT MODE
V AISALA _________________________________________________________________________ 85
at 1100 hPa/mbar pressure. The gate-open time could be 0.5 ... 1
second.
The pulse output mode settings must be made on two levels:
- software settings
- hardware settings.
Example of software settings for the pulse output mode:
>pulse <cr>
OFF
SLOW LOW 0.0
>pulse on slow low <cr>
ON
SLOW LOW 0.0
>pulse on fast high -800 <cr>
(note the negative sign of
pressure offset)
ON FAST HIGH -800.0
>pulse off <cr>
OFF
FAST HIGH -800.0
>
As a hardware setting the user must set the switch SW3 to the position
ON (see Hardware settings) for the barometer to start to wait for an
external trigger pulse.
ON
OFF
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
S1
The pulse output mode can be tested through the RS232C serial
interface using the PTEST command (see Diagnostic commands). The
switch SW3 may be in position ON or OFF (see Hardware settings)
when the PTEST command is being used.
Examples of pulse output mode testing:
>pulse <cr>
ON
SLOW LOW 0.0
>ptest <cr>
1013.250 1013.250 10133
(outputting prevailing pressure)
>pulse slow low -800 <cr>
ON
SLOW LOW -800.0
>ptest <cr>
1013.250 213.250 2133