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Lufft SHM31 User Manual
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UMB
com
mun
icat
ion
Snow depth sensor SHM 31
,
V2.1
41
9.3.6.
CRC calcu
lation
The CRC
is calculat
ed accor
ding to the
following r
ules:
Norm:
CRC
-
CCITT
Polyn
omia
l:
1021h = x
16
+ x
12
+ x
5
+ 1 (
LSB first mod
e)
Start value
:
FFFFh
For more
information
, see the d
escription o
f a CRC c
alculation
in the UM
B protocol.
40
42
Table of Contents
Table of Contents
3
Read before Commissioning
5
Symbols Used
5
Safety Instructions
5
Notes on Laser Safety and Laser Classification
5
Intended Use
6
Incorrect Use
6
Brand Names Used
6
Item Names and Technical Data
7
Labelling
7
Technical Data
8
Scope of Delivery
9
Additional Documents and Software
11
Description of the Device
12
Basic Principles of the Measurement Method
12
Introduction to Assembly and Commissioning
12
Sensor Heating
13
Generating the Measured Values
14
Measured Values (Curr, Avg)
14
Normal Mode
14
Assembly
15
Assembly Instructions
15
Connections
17
Connecting the Device
17
Connector Pin Assignment
17
Recommended Cable Shield Connection
17
Supply Voltage
17
Data Interfaces
17
Heating Release
17
Commissioning
18
Important Information for Commissioning
18
Switching on
18
Settings over RS232 or RS485
18
UMB Configtool.net
18
Basic Installation with Configtool.net and a Serial Interface
18
The SHM 31'S Sensor Parameters
26
Communication over UMB-ASCII 2.0
29
Syntax
29
Checksum
29
Examples
29
Description of the Data Telegram #1 with an Example
30
Angle Adjustment
30
Switching from UMB Protocol to ASCII Protocol
30
ASCII Command Overview
31
UMB Communication
37
Factory Settings
37
Overview of Measuring Channels
37
Communication in Binary Protocol
39
Data Frame
39
Addressing with Class ID and Device ID
39
Example of Creating Addresses
39
Example of a Binary Protocol Query
39
Status and Error Codes in the UMB Binary Protocol
40
CRC Calculation
41
Communication in SDI-12 Mode
42
Connector Pin Assignment
42
Settings for Using SDI-12
42
Exiting SDI Mode
42
Command Overview
43
Setting the Address
44
Measured Data Telegrams
44
Example: C and M Queries of the SHM 31-UMB
45
Buffer Assignment - Basic Data - SHM 31-UMB
45
Additional Measuring Commands
46
Device Identification Telegram
47
Telegram Verification
47
Query Measured Value Parameter Command (SDI-12 V1.4)
48
Switching Commands
49
Unit System Changeover Command
49
Device Reset Command
49
End Measurement Command
50
Start Measurement Command
50
Laser on Command
50
Laser off Command
50
Calibrate Offset and Angle Command
50
Calibrate Offset Command
51
Switch on Defrost Heating Cycle Command
51
Switch off Defrost Heating Cycle Command
51
Parameter Setting Commands
51
Retrieving the Current Parameter Setting
51
Setting the Parameter Setting
52
Communication in Modbus Mode
53
Modbus Connection and Communication Parameters
53
Addressing
53
Modbus Functions
53
0X03 Read Holding Registers, 0X06 Write Single Register, 0X16 Write Multiple Registers Function
53
0X04 Read Input Registers Function
55
Checking the Signal Quality
59
Application
59
Service, Maintenance and Technical Support
61
Firmware Update
61
Maintenance
61
Faults
63
Possible Indications of Error on the Snow Depth Sensor
63
Potential Interferences that May Affect Correct Functioning
63
Error Codes
63
UMB Status Codes
64
Disposal Information - Within the EU
65
Disposal Information - Outside the EU
65
Repair / Maintenance
65
Technical Support
65
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Lufft SHM31 Specifications
General
Brand
Lufft
Model
SHM31
Category
Accessories
Language
English
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