Vaisala PTB220 User Manual download pdf (Page 21)

CHAPTER 4_____________________________________________________________ COMMISSIONING

VAISALA _________________________________________________________________________ 15

NOTE

The pulse output mode can be used with hPa/mbar pressure units

only!

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 minus sign)

ON FAST HIGH -800.0

>pulse off <cr>

OFF FAST HIGH -800.0

The operation of pulse output mode can be tested through the RS232C

serial interface using the PTEST command (see page 69).

In addition to the above mentioned software settings, the user must

finally set the switch SW3 to position ON (see Hardware settings on

page 33) for the barometer to start to wait for an external trigger pulse.

See page 83 for quick reference information on how to set and use the

pulse output mode of the PTB220 series digital barometers.

NOTE

In case of an error in a PTB220 series barometer, 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.

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Vaisala PTB220 User Manual Page 21