Vaisala HMP240 User Manual
Page 87
HMP240
M210300en
Appendix 1: Serial commands
85
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 mode
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>