Vaisala PTB220 - Manual (Page 54)

U SER ' S G UIDE _______________________________________________________________________
48 ___________________________________________________________________ M210194 EN -A
POLL mode
T ABLE 6-2 summarizes the commands used in the POLL mode. The
commands are not case sensitive.
T ABLE 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
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
Address : 7
>smode poll
Serial mode
: POLL
>close
line closed
send 7
(text invisible)
1013.25 hPa