ASTECH LDM41A User manual

Manual
LDM41A and LDM42A
Version 3.3

LDM41A and LDM42A Manual
Page 2 ASTECH GmbH
Dear User,
You are advised to carefully read this User Manual before powering on the
LDM41A and LDM42A Laser distance measuring sensor for the first time.
This is necessary to ensure that you will be able to utilize all the capabilities
and features which your new acquisition provides.
This technology is subject to continuously ongoing development.
Editorial deadline: March 2015
Firmware version: ≥7.05 and 8.06
Manual version: V 3.3
FIle: Manual_LDM41-42A_EN_V3.3.docx
Note:
Proper care has been used in compiling this document. No liability will be
accepted in the event of damage resulting from failure to comply with the
information contained herein.
Revisions history
Manual Version
Date
Changes
3.3
16.03.2015
New design
ASTECH GmbH, Schonenfahrerstr. 5, D-18057 Rostock
Internet www.astech.de E-Mail [e-mail]
Telefon +49 (0)381 / 44073-0 Telefax +49 (0)381 / 44073-20

LDM41A and LDM42A Manual Content
ASTECH GmbH Page 3
I. Content
1General.......................................................................................................7
2Safety Instructions .....................................................................................9
2.1 General Safety Instructions ...............................................................9
2.2 Intended & Conforming Use ............................................................. 9
2.3 Nonconforming use...........................................................................9
2.4 Laser Classification .......................................................................... 10
2.5 Electric Supply ................................................................................. 11
2.6 Important Operating Advice ........................................................... 11
3Technical Data..........................................................................................12
4Mechanical Mounting Conditions............................................................ 14
5Electrical Connection ............................................................................... 16
5.1 Connector Terminal.........................................................................16
5.2 Interface Cable ................................................................................ 17
5.3 Shield and Grounding......................................................................19
5.4 Termination of RS232...................................................................... 20
6Limiting Values for Voltages .................................................................... 21
7Start up .................................................................................................... 22
8Commands and Parameter ......................................................................24
8.1 General............................................................................................ 24
8.2 DT –distance tracking .....................................................................28
8.3 DS –distance tracking (<7 m)..........................................................28
8.4 DW –distance tracking with target board (10 Hz) ..........................28
8.5 DX –distance tracking with target board (50 Hz) ........................... 29
8.6 DF –distance measurement with external trigger.......................... 29
8.7 DM –distance measurement ..........................................................30
8.8 TP –internal temperature [°C] ........................................................30
8.9 SA –display/set average value [1..20] ............................................30
8.10 SD –display/set display format [d/h/s}] ......................................... 30
8.11 ST –display/set measure time [0..25]............................................. 31
8.12 SF –display/set scale factor ............................................................32
8.13 SE –display/set error mode [0/1/2]................................................ 33

Content LDM41A and LDM42A Manual
Page 4 ASTECH GmbH
8.14 AC –display set ALARM center ....................................................... 33
8.15 AH –display/set ALARM hysterese................................................. 34
8.16 AW –display/set ALARM width ...................................................... 34
8.17 HO –display/set Temperature for heating on ................................ 34
8.18 HF –display/set Temperature for heating off 20 ............................. 35
8.19 RB –display/set distance of IOUT = 4 mA ......................................... 35
8.20 RE –display/set distance of IOUT = 20 mA........................................ 35
8.21 RMx y z –display/set remove measurement.................................. 35
8.22 TDx y –display/set trigger delay trigger level................................. 36
8.23 TMx y –display/set trigger mode trigger level ............................... 37
8.24 BR –display/set baud rate [2400..38400] ...................................... 38
8.25 AS –display/set autostart command.............................................. 38
8.26 OF –display/set distance offset...................................................... 39
8.27 SO –set current distance to offset ................................................. 39
8.28 LO –Laser on................................................................................... 39
8.29 LF –laser off.................................................................................... 39
8.30 PA –display settings ....................................................................... 39
8.31 PR –reset settings .......................................................................... 40
9Interface Connection ............................................................................... 41
9.1 Serial Interface RS232 ..................................................................... 41
9.2 Serial Interface RS422 ..................................................................... 42
9.3 Output Format on the serial interface............................................ 42
9.4 Digital Switching Output (Alarm) .................................................... 43
9.5 Analog Output................................................................................. 45
9.6 Trigger Input ................................................................................... 47
10 List of Commands .................................................................................... 48
11 Error Codes .............................................................................................. 50
12 PC Interface Cable (Option) ..................................................................... 51
13 EG Declaration of Conformity.................................................................. 52
14 Part Numbers........................................................................................... 53

LDM41A and LDM42A Manual Content
ASTECH GmbH Page 5
II. List of Figures
Figure 1 : Measurement principle ...................................................................... 7
Figure 2 : Warning Sign Laser Radiation Class 2 ...............................................10
Figure 3 : Dimensional drawing ........................................................................14
Figure 4 : Offset against zero-edge................................................................... 15
Figure 5 : View of LDM41A and LDM42A pole assignments.............................16
Figure 6 : Interface cable with connector.........................................................17
Figure 7 : Interface cable color codes............................................................... 17
Figure 8 : Isolated Mounting............................................................................. 19
Figure 9 : Recommended terminations wiring for work with open RS-232 ..... 20
Figure 10 : Program LDMTool........................................................................... 22
Figure 11 : Help text Firmware V7.x .................................................................24
Figure 12 : Help text Firmware V8.x .................................................................25
Figure 13 : Trigger level = 1............................................................................... 38
Figure 14 : Trigger level = 0............................................................................... 38
Figure 15 : Diagram of RS232 wiring at 9-position D-Sub cable jack ................41
Figure 16 : Diagram of RS232 wiring at 25-pole D-Sub cable jack .................... 41
Figure 17 : RS232 wiring diagram ..................................................................... 42
Figure 18 : Wiring diagram of digital switching output ....................................43
Figure 19 : Digital switching output behavior................................................... 44
Figure 20 : Wiring diagram of analog output....................................................45
Figure 21 :Output current diagram for RE > RB and RE < RB............................ 46
Figure 22 : Wiring diagram of trigger input ...................................................... 47
Figure 23 : RS232 cable with power supply for LDM41A and LDM42A ............51

Content LDM41A and LDM42A Manual
Page 6 ASTECH GmbH
III. List of Tables
Table 1 : Technical data.................................................................................... 12
Table 2 : Pin assignment connector and interface cable.................................. 18
Table 3 : Input voltages .................................................................................... 21
Table 4 : Output voltages ................................................................................. 21
Table 5 : Commands of the LDM41A and LDM42A .......................................... 26
Table 6 : Output format.................................................................................... 30
Table 7: Examples for Scale factor ................................................................... 33
Table 8 : Meaning of SE .................................................................................... 33
Table 9 : List of commands............................................................................... 48
Table 10 : Error Codes ...................................................................................... 50
Table 11 : Pin assignment SUB-D 9 F ................................................................ 51
Table 12 : Pin assignment LDM41A and LDM42A ............................................ 51
Table 13 : Part Numbers................................................................................... 53

LDM41A and LDM42A Manual General
ASTECH GmbH Page 7
1General
The LDM41A and the LDM42A are Laser sensors to measure distances from
0.1 m to more than 100 m with pinpoint accuracy.
A given target can be clearly identified with the help of a red Laser sighting
point. In terms of operating reach, the LDM41A and the LDM42A performs
depending on the reflectance, morphology and qualities of the target to be
measured.
The sensor works based on comparative phase measurement. It emits
modulated Laser light which is diffusely reflected back from the target with a
certain shift in phase to be compared with a reference signal. From the
amount of phase shift, a required distance can then be determined with
millimeter accuracy.
Figure 1 : Measurement principle
A distance measuring cycle can be triggered in three different ways:
By sending a command from the PC or another equivalent control
unit
By making appropriate prior parameter settings for the auto start
command and applying supply voltage
By external triggering (in remote-trigger mode).
For a more detailed description of these three trigger options, you should
consult chapter 8, Commands and Parameter of this User Manual.

General LDM41A and LDM42A Manual
Page 8 ASTECH GmbH
Special performance features are:
Provides high accuracy and great reach under extreme outdoor
temperatures.
Works in a wide range of operating voltages from 10 V= to 30 V= from an
on-board vehicle supply point, an industrial direct voltage supply net or a
DC power pack.
Features consistently low power consumption of <1.5 W
1
(without IAlarm)
Up to 30 m reach for distance measurement, with potential for more than
100 m reach if additional reflectors
2
are mounted onto the target
(depending on reflectance and environmental conditions).
Visible Laser beam for easier sighting.
RS232 interface port for input of measuring functions and commands from,
and output of measured values to, a PC or a laptop.
Switching output and analog output are separately programmed.
Switching output with adjustable limit and hysteresis.
Measured values can be displayed in meters, decimetres, centimetres, feet
and inches due to.
Option for remote triggering of a measurement from an external trigger
device.
3
1
inactive internal heating for devices with internal heating (LDM41-42A /h)
2
e.g. 3M, self adhesive foil white non glossy or foil 3290 for longer distances
3
Trigger function is not available for devices with internal heating (LDM41-42A /h)

LDM41A and LDM42A Manual Safety Instructions
ASTECH GmbH Page 9
2Safety Instructions
2.1 General Safety Instructions
These safety and operating instructions should be carefully read and followed
during practical work with the LDM41A and the LDM42A.
There is danger of Laser radiation or electrical shock. For necessary
repair work, the LDM41A and the LDM42Amay not be opened by
anyone other than Manufacturer personnel. Unauthorized
intervention into the inner product space will void any warranty
claims.
Compliance with all specified operating conditions is necessary.
Failure to observe advisory notes or nonconforming product usage may cause
physical injury to the user or material damage to the LDM41A and the
LDM42A.
Cable connectors must not be plugged or unplugged under voltage.
Remember to turn voltage supply off before you begin working on cable
connections.
2.2 Intended & Conforming Use
Measurement of distances
Special measuring functions
Compliance with prescribed temperatures for operation/storage
Operation at correct voltage level
Application of specified signal levels to the appropriate data lines
2.3 Nonconforming use
Do not operate the LDM41A and the LDM42A in any other way than
described under "Intended & Conforming Use" above and only in a
proper working condition
Safety devices must not be defeated or otherwise rendered
ineffective
Information and warning signs must not be removed

Safety Instructions LDM41A and LDM42A Manual
Page 10 ASTECH GmbH
Repair work on the LDM41A and the LDM42A must not be carried
out by anyone other than authorized personnel.
Refrain from using the LDM41A and the LDM42A without certified
protection in an explosive environment
Measurement with the LDM41A and the LDM42A pointed at the
sun or other strong light sources may produce faulty results
Measurement of targets with poor surface reflectance in a strongly
reflecting environment may also result faulty measurements.
Measurement of strongly reflecting surfaces may deliver faulty
results.
Measurement performed through transparent optical media, for
example glass, optical filters, Plexiglas, etc. may equally produce
incorrect results.
Measurement on translucent objects (materials allow light to pass
through, but are not transparency, e.g. polystyrene, wax, different
plastics etc.) can give a too large measured value, since also light is
reflected by deeper layers
Rapidly changing measuring conditions are likely to falsify the result
of measurement
2.4 Laser Classification
The LDM41A and the LDM42A are Class 2 laser product, ≤1 mW as stipulated
in EN60825-1:2007, Class 2.
Caution:
There is Class 2 Laser radiation. Do not stare into beam!
Figure 2 : Warning Sign Laser Radiation Class 2
The Laser power is limited to maximum 1 mW. The Laser radiation is visible. A
short-term exposure (duration up to 0.25 s) is harmless to the eye.