Vaisala HMP260 User Manual
Page 83
HMP260 SERIES
Appendix 1: Serial commands
HMP260-U017en-1.5
OPEN aa <cr>
SMODE xxxx<cr>
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. For example:
>SMODE <cr>
which mode is in use at the moment
Serial mode : STOP
>SMODE STOP <cr>
setting STOP state
Serial mode : STOP
OPEN & CLOSE
OPEN nn <cr>
nn
=
address of the transmitter (0...99)
CLOSE <cr>
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 (<bel> = ASCII 7):
OPEN 2 <cr>
<cr><lf> 'HMP nn line opened for operator commands' <cr><lf><lf><bel>
CRH <cr>
...
CLOSE <cr>
<cr><lf> 'line closed' <cr><lf>