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2 open & close – Vaisala HMP260 User Manual

Page 43

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HMP260 SERIES

HMP260-U017en-1.5

Operating Manual

1997-11-25

37

In POLL mode: measurements output only with command SEND. When in

POLL mode, the output state is changed as follows:

OPEN aa

SMODE xxxx

aa

=

address of the transmitter

xxxx

=

STOP, RUN or POLL

The OPEN command sets the bus temporarily in STOP mode so that the
SMODE command can be given.

Example:

>SMODE STOP

setting STOP mode

Serial mode : STOP

5.4.3.2

OPEN & CLOSE

OPEN nn

nn

=

address of the transmitter (0...99)

CLOSE

In STOP mode: command OPEN has no effect, CLOSE sets the transmitter in

POLL mode

In POLL mode: command OPEN sets the transmitter temporarily in STOP

mode, command CLOSE returns the instrument to POLL
mode

Example:
relative humidity calibration is performed at transmitter 2 which is in POLL
mode

OPEN 2

opens the line to transmitter 2

CRH

calibration started

...
CLOSE

line closed