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HMP240

M210300en Appendix 1: Serial commands

3. OUTPUT VIA THE SERIAL BUS

R Starting the measurement output

R <cr>

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 variables used. The sequence,

however, is always the same: relative humidity, temperature, dewpoint

temperature, absolute humidity, mixing ratio, wet bulb temperature and

dewpoint difference. An example:

RH= 43.0 %RH T= 21.0 'C Tdp= 8.0 'C x= 6.7 g/kg Tw=

13.7 'C <cr><lf>

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<cr>

Ends the RUN state; after this command all other commands are available.

SEND Outputting a reading once

SEND <cr> in STOP mode

SEND aa <cr> in POLL mode

aa = address of the transmitter when more than one transmitter is

connected to a serial bus (0...99; set with command ADDR)

Outputs the current measurement readings via the serial line. The output for-

mat depends on which parameters the transmitter can output. Output types are:

"Td=999.9 'C", <cr><lf>

"RH=999.9 %RH T=999.9 'C Td=9999.9 'C",<cr><lf>

"Td=999.9 x=999.9 g/kg",<cr><lf>

"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",<cr><lf>

The output mode can be changed with command FORM.

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Vaisala HMP243 Guía de usuario Pagina 79