Vaisala HMP230 User Manual
Page 57
HMP230 SERIES
M210225en-B
User's Guide
51
6.4.2.9. Setting the calculation mode
Disconnect the security lock jumper!
FROST ON/OFF
This command is used to select whether the transmitter calculates the
frostpoint or the dewpoint (default) 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
>
6.4.2.10. Resetting the transmitter
RESET
6.4.3. Operating the transmitter via the serial bus
6.4.3.1. 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 state, the output state is changed as follows:
OPEN aa
SMODE xxxx
aa
=
address of the transmitter
xxxx
=
STOP, RUN or POLL
The OPEN command sets the bus temporarily in STOP state so that the
SMODE command can be given.