Lufft SHM31 User Manual

Communication in SDI-12 mode
52 Snow depth sensor SHM 31, V2.1
0XPLMI+5000<CR><LF>
10.12.2. Setting the parameter setting
Command: aXPccc<+/->nnn!
aXPccc<+/->fff.f!
ccc: Three-character parameter code; see table
nnn, fff.f: Parameter value to be set, number of digits as required
The entry can be made both as an integer and as a floating point number, regardless of the
parameter’s number type, and the value is rounded if necessary.
Response: aXPccc<+/->nnn<CR><LF> for integer
par
ameters
nnn: New parameter
aXPccc<+/->ff.f<CR><LF> for
f
loating
poi
nt
p
arameters
ff.f: New parameter
The number of nnn or fff digits is variable according to the parameter value.
aXP_invalid<CR><LF> if the new parameter value is beyond
the limits
aXP_invalid-<CR><LF> parameter without a leading sign, but with
a negative number set
aX_noCmd<CR><LF> in case of unknown parameter code ccc
Example: Setting the laser measurement interval, SHM 31-UMB with SDI-12 ID ‘0’
0XPLMI+2500! or 0XPLMI+2500.0!
0XPLMI+2500<CR><LF>
Code
Function
Data type
Value limts (factory
settings in bold characters)
Units
ATI
Measurement interval
uint16
0 … 60
s
HWM
Window heating mode
uint8
0 / 1
-
HBM
Block heating mode
uint8
0 / 1
-
HEP
Enable external switching of
heating
uint8
0 / 1
-
HDM
Heating defrost after power on
uint8
0 / 1
-
AOF
Distance offset
float
0.0 … 16000.0
mm
AAN
Correction angle
float
0.0 … 180.0
°
UAA
Use accelerometer angle
uint8
0 / 1
-
MSA
Time constant for suppression of
short term depth changes
uint16
0 … 600 … 65535
s
MSD
Maximum accepted change of
snow depth per interval
float
-20000.0 … 20.0 … 20000.0
mm
LMM
Laser measure mode
uint8
0 … 7
-
LMI
Laser measurement interval
uint32
1000 … 10000 … 60000
ms
Table 11: SDI-12, setting the parameter settings

Lufft SHM31 Specifications

General

Brand	Lufft
Model	SHM31
Category	Accessories
Language	English