Vaisala DM500 - Manual (Page 103)

Chapter 16 _____________________________________________________ Serial Line Commands
VAISALA ______________________________________________________________________ 101
The function of XPRES is the same as with the command PRES
except that with the command XPRES the setting is valid only until
power is turned off or the command XPRES is given without a
pressure value. After this the pressure stored with the command PRES
is valid again.
Example:
>pres 1.0231
Pressure: 1.0231 bar
>xpres 5.5
Pressure: 5.5 bar
>xpres
Pressure: 1.0231 bar
>
TP Setting the Temperature
Syntax: TP<cr>
Sets the temperature if there is no temperature sensor in the system.
Set accurate process temperature values to achieve valid RH readings.
Command has not effect if process temperature sensor is available.
Example:
>tp ?
Temperature : 20 'C
>tp
Temperature : 23 'C ? 23
>
NOTE
If the temperature setting is frequently adjusted, e.g. by using an
external thermometer as a temperature input source, the command
XTP is recommended.
XTP Setting the Temperature Temporarily
Syntax: XTP xx.xx<cr>
where
xx.xx =
temperature