Vaisala HMP240 User Manual
Page 86
HMP240
Appendix 1: Serial commands
M210300en
84
When asking the current address, no address number is given:
>ADDR
Address : 2 ?
FROST
Setting the calculation mode
Disconnect the security lock jumper!
FROST ON/OFF
This command is used to select whether the transmitter calculates the
frostpoint (default) or the dewpoint reading at dewpoint temperatures below
0
°
C. Select FROST ON for frostpoint and FROST OFF for dewpoint
calculations. For example:
>Frost
Frost :
ON
>Frost off
Frost : OFF
>Frost on
Frost : on
>
RESET
Resetting the transmitter
RESET
Resets the transmitter. All settings that have been changed remain in the mem-
ory even after reset or power failure.
3.1
Operation modes
SMODE
Setting the serial interface
SMODE xxxx
xxxx
=
STOP, RUN or POLL
In STOP mode: measurements output only by command, all commands can be
used
In RUN mode:
outputting automatically, only command S can be used
In POLL mode: measurements output only with command SEND. When in
POLL mode, the output state is changed as follows:
OPEN aa