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Vaisala HMP228 User Manual

Page 66

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HMP228 Transmitters
Appendix 1: Serial commands

M210282en-A

60

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

When more than one transmitter is connected to the same serial bus, the POLL
mode makes it possible to communicate with the transmitters. For example, a
relative humidity calibration is performed at transmitter 2 ( = ASCII 7):

>OPEN 2
'HMP nn line opened for operator commands'

>CRH
...
>CLOSE
'line closed'