Lufft SHM31 User Manual

Communication over UMB-ASCII 2.0
30 Snow depth sensor SHM 31, V2.1
(Channel busy)
B
001:4E:CHN;523<CR><LF>
<STX>B001:4E:CHN;523:24:<CheckSum><CR><LF><EOT>
(Channel unknown)
8.4. Description of the data telegram #1 with an example
<Add>:<Nr>:Payload:UMB status:checksum of the data telegram #1:
B001:4E:SS;1=085;003.0117;+02.1253;185;+15;17.8;15:00:8E
Example
Length in bytes
Description
B001:4E:SS;1=
13
Repeat request command, address, ...
085
3
Telegram number
;
1
Delimiter, user adjustable
003.0117
8
First 8 digits of the serial number
;
1
Delimiter, user adjustable
+02.1253
8
Snow depth
;
1
Delimiter, user adjustable
185
3
Signal strength [0;255]
;
1
Delimiter, user adjustable
+15
3
Window temperature
;
1
Delimiter, user adjustable
17.8
4
Tilt angle
;
1
Delimiter, user adjustable
15:
3
Error code (E15)
00:
3
UMB status code
8E
2
Checksum
56
Sum
Table 5: ASCII telegram example
8.
5. Angle adjustment
For the automatic calibration the following commands have to be sent consecutively:
MEN, ARV and MST
For the manual angle adjustment the commands AOF and AAN are used.
8.
6. Switching from UMB protocol to ASCII protocol
The UMB hex-code for switching from the UMB protocol to the ASCII protocol is as follows:
01 10 01 B0 01 F0 06 02 22 10 75 00 01 09 03 71 25 04
A
fterwards the sensor needs a reset. The UMB hex-code for the reset is:
01 10 01 B0 01 F0 03 02 25 10 10 03 EC 44 04
E
xamples for the Bray terminal program: The two codes are as follows:
$01$10$01$B0$01$F0$06$02$22$10$75$00$01$09$03$71$25$04
$01$
10$01$B0$01$F0$03$02$25$10$10$03$EC$44$04

Lufft SHM31 Specifications

General

Brand	Lufft
Model	SHM31
Category	Accessories
Language	English