Operating Manual V25/09.2019
Ventus / Ventus-X / V200A
Chapter 20 Appendix 64
0+0000+00<CR><LF>
0D1!
0+73.0+65.3<CR><LF>
Example (SDI-12 Address ‘0’, temperature sensor failure):
0V!
00004<CR><LF>
0D0!
0+0300+00<CR><LF>
0D1!
0+73.0+65.3<CR><LF>
20.6.8 Message Selection of Measurement Unit System
The command is used to change the unit system used for the display of the SDI-12 data
between metric and US units. The command is implemented as X command
Command: aXU<u/m>!
Response: aU<u/m><CR><LF>
u: US-Units, m: Metric Units
Example Select metric units
0XUm!
0Um<CR><LF>
20.6.9 Message Adjustment of the Altitude
For the calculation of the relative air pressure the local altitude (above sea level) of the device is
required
Command: aXH+nnnn!
nnnn: Altitude of Sensor in m
Response: aXH+nnnn<CR><LF>
The assignment of an invalid altitude ( -100 < altitude < 5000) will be answered with
aXHf<CR<<LF>
Example: The altitude of the location of installation is 135m
0XH+135!
0XH+135<CR><LF>
20.6.10 Message setting of the Heating Mode
The heating of the sensor may be configured in different modes (see 6.3.1 and 12.2.6).
The SDI12 command sets combinations of heating operation mode and heating power mode.
Command: aXMn!
n: Heating Mode (0: Off, 1: Automatic/full power, 2: Automatic/alternating)
Response: aXMnm<CR><LF>
n: selected heating mode (0: Off, 1: automatic)
m: selected power mode (0: full, 1: alternating)
The assignment of an invalid heating mode will be answered with
aXMf<CR><LF>
Example: A
Ventus
shall be set to Automatic/Alternating
0XM2!
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