Vaisala PTB220 User Manual download pdf (Page 54)

USER'S GUIDE_______________________________________________________________________

48 ___________________________________________________________________ M210194EN-A

POLL mode

TABLE 6-2 summarizes the commands used in the POLL mode. The

commands are not case sensitive.

TABLE 6-2 Commands used in RUN and STOP modes

Function Command

single message output SEND a

opening a barometer OPEN a

closing a barometer CLOSE

The POLL mode is used when several PTB220 series barometers are

connected to one RS232C serial interface for fine adjustment and

calibration in one batch. It is also used when several intelligent

transmitters are connected to a half duplex RS 485/422 serial

interface. See pages on page 38, on page 91 and on page 93.

In the POLL mode the barometer must have a specific address so that

the host systems will be able to direct the outputting command to the

particular barometer. The addressable SEND a command is used to

ask for a single message output from the barometer.

The OPEN a command can be used to open a single barometer

temporarily to STOP mode. The CLOSE command will restore the

POLL mode.

SEND Outputting one single message

SEND a <cr>

where:

a = the address of the barometer (0...99)

This command is used to output one message from the barometer in

the POLL mode (see SMODE command).

Example:

>addr 7 <cr>

Address : 7

>smode poll <cr>

Serial mode : POLL

>close <cr>

line closed

send 7 <cr> (text invisible)

1013.25 hPa

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Vaisala PTB220 User Manual Page 54