Vaisala HMP228 - Manual (Page 66)

HMP228 Transmitters
Appendix 1: Serial commands
M210282en-A
60
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>