Operating Instructions Smart Weather Sensor
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 117
19.6.14 Message: Setting the Heating Mode
The heating of the precipitation and the wind sensors can be configured in different operation
modes (see chapter 10.4). Depending on the actual variant of the Smart Weather Sensor
(WS200-UMB ...WS700-UMB) only certain combinations of operating modes are available.
The Smart Weather Sensor evaluates the valid combinations from the device heating mode
requested in the command automatically.
Command: aXMn!
n: Heating Operating Mode (0: Automatic, 1: Mode 1, 2: Off, 3: Eco Mode 1)
Response: aXMnm<CR><LF>
n: Selected Heating Mode Wind Sensor
m: Selected Heating Mode Precipitation Sensor
The response to the attempt of setting an invalid operation mode is
aXMf<CR><LF>
Example: A WS400-UMB shall be set to Mode 1
0XM1!
0XM21<CR><LF>
As the WS400-UMB does not have a wind sensor the heating mode wind is automatically set
to 2 (= off).
19.6.15 Message: Setting of the Leaf Wetness Threshold
The parameter to be set defines the voltage threshold for the leaf wetness sensor (WS401-
UMB and WS601-UMB only, see p. 63), where the leaf wetness state changes between 0
and 1. With SDI12 operation, the voltage value required for the evaluation of the correct
threshold setting is retrieved with the aM6! command (see p.110).
Command: aXB+nnn.n!
nnn.n: threshold for leaf wetness state in mV
Response: aXB+nnn.n<CR><LF>
The response to the attempt of setting of an invalid threshold (200.0<=threshold<=1200.0) is
aXBf<CR><LF>
Example: The leaf wetness voltage measured in dry condition is 613mV. The recommended
setting of the threshold is 633mV
0XB+633.0!
0XD+633.0<CR><LF>
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