Vaisala PTB220 Series Guía de usuario descargar pdf (Pagina 49)

CHAPTER 6________________________________________________________________ OPERATING

VAISALA _________________________________________________________________________ 43

CHAPTER 6 OPERATING

Only a few commands are needed to operate a PTB220 barometer in

the RUN, STOP and POLL modes. In the SEND mode and in the

PULSE mode no commands are needed.

In the RUN or STOP modes the commands R, S and SEND can be

used. The user may also use his own SEND command if he has

previously specified one using the SCOM command (see Chapter

Software settings).

In the POLL mode, the barometer responds to a SEND command only

if it includes the address of the barometer. OPEN and CLOSE

commands are also available for temporary communication with one

single barometer.

In the SEND mode, no commands are needed. The barometer will

automatically output one message at power-up, or when triggering the

barometer on using pin 4 of the barometer.

In the PULSE mode, the barometer requires a trigger pulse from the

host system. In this case, the barometer must be powered-up

separately and the pulse trigger signal must be given to the barometer

after the settling time has elapsed.

RUN and STOP modes

TABLE 6-1summarizes the commands that are used in the RUN and

STOP modes. In addition, the user may use his own SEND command

if he has previously specified one with the SCOM commissioning

command. The commands are not case sensitive except for the SCOM

command.

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Vaisala PTB220 Series Guía de usuario Pagina 49