Lufft SHM31 - Page 34

Communication over UMB-ASCII 2.0
34 Snow depth sensor SHM 31, V2.1
Command
UMB-ASCII 2.0
Standard
value
Read,
Write,
Command
Name Description
ASH<;><Nr> R
Adj.SignalHighRelfectivity
<#> corresponds to the
distances (1=a, 2=b, …, 5=e)
Signal calibration for targets
with 85% reflectivity in 5
distances, <#> = [1..5]
ASL<;><Nr> R
Adj.SignalLowReflectivity
<#>
Signal calibration for targets
with 6% reflectivity in 5
distances, <#> = [1..5]
Table 9: ASCII parameters for adjustment
Command
UMB-ASCII 2.0
Standard
value
Read,
Write,
Command
Name Description
HEP 0 RW
HeaterEnablePin
Use the hardware trigger for
the heater (EXT_TRIG_IN):
0=off, 1=on
HBM 1 RW
HeaterBlockMode
Block heater mode: 0=off;
1=automatic: heat to set
temperature and maintain;
see “HBT“, “HBH“;
2=enable defrost heating
cycle once;
3=stop the current defrost
heating cycle and switch to
previous mode (0 or 1).
HBT 7,5 RW
HeaterBlockTemperature
Set temperature in °C used in
automatic heater mode
(“HBM“=1).
HBH 2,5 RW
HeaterBlockHysteresis
Hysteresis; temperature is
kept with this range in the
automatic heater mode
(“HBM“=1).
HWM 1 RW
HeaterWindowMode
Window heater mode: 0=off;
1=automatic: heat to set
temperature and maintain;
see “HWT“, “HWH“;
2=enable defrost heating
cycle once;
3=stop the current defrost
heating cycle and switch to
previous mode (0 or 1).
HWT 20 RW
HeaterWindowTemperature
Set temperature in °C used in
automatic heater mode
(“HWM“=1).