Vaisala HMP260 - Manual (Page 75)

HMP260 SERIES
Appendix 1: Serial commands
HMP260-U017en-1.5
3 OUTPUT VIA THE SERIAL BUS
R Starting the measurement output
R
Starts output of measurements to the peripheral devices (PC display or printer); output
interval is set with command INTV.
The output format depends on the transmitter configuration and the variables in use. The
order, however, is always the same: relative humidity, temperature, dewpoint
temperature, absolute humidity, mixing ratio and wet bulb temperature. An example:
RH= 43.0 %RH T= 21.0 'C Tdp= 8.0 'C x= 6.7 g/kg Tw= 13.7 'C
When the transmitter sends out the readings, the serial interface does not echo any
commands; the only command that can be used is S (stop).
The output mode can be changed with command FORM.
S Stopping the measurement output
S
Ends the RUN mode; after this command all other commands are available.
SEND Outputting a reading once
SEND in STOP mode
or
SEND aa in POLL mode
aa = address of the transmitter when more than one transmitter is con-
nected to a serial bus (0...99; set with command ADDR)
Outputs the current measurement readings via the serial line. The output format depends
on which parameters the transmitter can output. Output types are:
"RH=999.9 %RH T=999.9 'C",
"RH=999.9 %RH T=999.9 'C Td=9999.9 'C",
"RH=999.9 %RH T=999.9 'C a=9999.9 g/m3 x=9999.9 g/kg Tw=999.9 'C",
"RH=999.9 %RH T=999.9 'C Td=9999.9 'C a=9999.9 g/m3 x=9999.9 g/kg Tw=999.9
'C",