Lufft SHM31 User Manual

Communication in SDI-12 mode
48 Snow depth sensor SHM 31, V2.1
Sensor status coding:
Sensor status
Code
OK
0
Invalid_Channel
1
E2_CAL_ERROR
E2_CRC_KAL_ERR
FLASH_CRC_ERR
FLASH_WRITE_ERR
FLASH_FLOAT_ERR
2
MEAS_ERROR
3
MEAS_UNABLE
4
INIT_ERROR
5
VALUE_OVERFLOW
CHANNEL_OVERRANGE
6
VALUE_UNDERFLOW
CHANNEL_UNDERRANGE
7
BUSY
8
Other sensor status
9
Table 10: SDI-12, sensor status coding (for more information, also see documentation on the Lufft UMB protocol)
E
xample (SHM 31-UMB, SDI-12 address ‘0’, no errors):
0V!
00002<CR><LF>
0D0!
0+0000+0000<CR><LF>
Example (SHM 31-UMB, SDI-12 address ‘0’, laser temperature measurement failed):
0V!
00002<CR><LF>
0D0!
0+0030+0000<CR><LF>
10.10. Query measured value parameter command (SDI-12 v1.4)
The command retrieves the measured value identification of each individual measured value.
Command: aI<Measuring command>_0mm!
Measuring command: M, MC, M1 – M9, MC1 – MC9, C, CC, C1 – C9,
CC1 – CC9, R1 – R9, V
mm: Position of the measured value
Response: a, <Measured value code>,<Unit>,<Measured value type><CR><LF>
Value Code
Measurement Value
TBK
Block temperature
TAM
Ambient temperature
TLA
Laser temperature
ATL
Tilt angle
ATX
X angle
ATY
Y angle
ATZ
Z angle
ARF
Reference angle

Lufft SHM31 Specifications

General

Brand	Lufft
Model	SHM31
Category	Accessories
Language	English