ASTECH LDM41E User manual

Manual
LDM41E and LDM42E
Version 1.6

LDM41E and LDM42E Manual
Page 2 ASTECH GmbH
Dear User,
You are advised to carefully read this User Manual before powering on the
LDM41E and LDM42E 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: July 2018
Firmware version: ≥7.05 and 8.06
Manual version: V 1.6
FIle: Manual_LDM41-42E_EN_V1.6.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
1.6
27.07.2018
Max. Trigger voltage
1.5
29.06.2016
E19 added, MTBF
1.4
16.03.2015
New design
ASTECH GmbH, Schonenfahrerstr. 5, D-18057 Rostock
Internet: www.astech.de E-Mail: [e-mail]
Phone: +49 (0)381 / 44073-0 Fax: +49 (0)381 / 44073-20

LDM41E and LDM42E Manual Content
ASTECH GmbH Page 3
I. Content
1 General.......................................................................................................6
2 Safety Instructions ..................................................................................... 8
2.1 General Safety Instructions...............................................................8
2.2 Intended & Conforming Use ............................................................. 8
2.3 Nonconforming use...........................................................................8
2.4 Laser Classification ............................................................................9
2.5 Electric Supply ................................................................................. 10
2.6 Important Operating Advice ........................................................... 10
3 Technical Data..........................................................................................11
4 Mechanical Mounting Conditions............................................................13
5 Electrical Connection ............................................................................... 15
5.1 Rear-Side Cover Terminals ..............................................................15
5.2 Assignment of Terminals.................................................................16
5.3 Shield and Grounding......................................................................18
6 Limiting Values for Voltages ....................................................................19
7 Start up ....................................................................................................20
7.1 Start up with RS232.........................................................................20
7.2 Start up with Ethernet.....................................................................21
8 Commands and Parameter ......................................................................23
8.1 General............................................................................................23
8.2 DT –distance tracking ..................................................................... 25
8.3 DS –distance tracking (<7 m).......................................................... 25
8.4 DW –distance tracking with target board (10 Hz) ..........................25
8.5 DX –distance tracking with target board (50 Hz) ........................... 26
8.6 DF –distance measurement with external trigger..........................26
8.7 DM –distance measurement .......................................................... 27
8.8 TP –internal temperature [°C] ........................................................ 27
8.9 SA –display/set average value [1..20] ............................................27
8.10 SD –display/set display format [d/h/s}] .........................................27
8.11 ST –display/set measure time [0..25].............................................28
8.12 SF –display/set scale factor ............................................................ 29

Content LDM41E and LDM42E Manual
Page 4 ASTECH GmbH
8.13 SE –display/set error mode [0/1/2] ............................................... 30
8.14 AC –display set ALARM center ....................................................... 30
8.15 AH –display/set ALARM hysteresis ................................................ 31
8.16 AW –display/set ALARM width ...................................................... 31
8.17 HO –display/set Temperature for heating on ................................ 31
8.18 HF –display/set Temperature for heating off 17 ............................. 32
8.19 RMx y z –display/set remove measurement.................................. 32
8.20 TDx y –display/set trigger delay trigger level................................. 33
8.21 TMx y –display/set trigger mode trigger level ............................... 33
8.22 BR –display/set baud rate [2400..38400] ...................................... 35
8.23 AS –display/set autostart command.............................................. 35
8.24 OF –display/set distance offset...................................................... 35
8.25 SO –set current distance to offset ................................................. 35
8.26 LO –Laser on................................................................................... 36
8.27 LF –laser off.................................................................................... 36
8.28 PA –display settings ....................................................................... 36
8.29 PR –reset settings .......................................................................... 36
9 Interface Connection ............................................................................... 37
9.1 Ethernet .......................................................................................... 37
9.2 Serial Interface RS232 ..................................................................... 39
9.3 Output Format Ethernet and RS232 ............................................... 39
9.4 Digital Switching Output (Alarm) .................................................... 40
9.5 Trigger Input ................................................................................... 42
10 List of Commands .................................................................................... 43
11 Error Codes .............................................................................................. 45
12 EG Declaration of Conformity.................................................................. 46
13 Part Numbers........................................................................................... 47

LDM41E and LDM42E Manual Content
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II. List of Figures
Figure 1 : Measurement principle ......................................................................6
Figure 2 : Warning Sign Laser Radiation Class 2 .................................................9
Figure 3 : Dimensional drawing ........................................................................13
Figure 4 : Offset against zero-edge...................................................................14
Figure 5 : LDM41E and LDM42E terminals .......................................................15
Figure 6 : Isolated isntallation...........................................................................18
Figure 7 : Program LDMTool ............................................................................. 21
Figure 8 : Program EtherTool............................................................................ 22
Figure 11 : Trigger level = 1...............................................................................34
Figure 12 : Trigger level = 0...............................................................................35
Figure 13 : Telnet Program ...............................................................................37
Figure 14 : LDM41E Sensor Page ...................................................................... 38
Figure 15 : Digital output behavior, positive/negative hysteresis ....................41
III. List of tables
Table 1 : Technical data ....................................................................................11
Table 2 : LDM41E and LDM42E terminals......................................................... 15
Table 3 : Pin assignment power supply and trigger.......................................... 16
Table 4 : Pin assignment Fast Ethernet............................................................. 16
Table 5 : Pin assignment RS232 ........................................................................17
Table 6 : Pin assignment programming cable................................................... 18
Table 7 : Input voltages..................................................................................... 19
Table 8 : Output voltages..................................................................................19
Table 10 : Output format LDM41E and LDM42E ..............................................27
Table 11 : Examples of Scale factor ..................................................................30
Table 12 : Meaning of SE .................................................................................. 30
Table 13 : Command list LDM41E and LDM42E................................................ 43
Table 14 : Error codes ....................................................................................... 45
Table 15 : Part numbers.................................................................................... 47

General LDM41E and LDM42E Manual
Page 6 ASTECH GmbH
1General
The LDM41E and LDM42E is a Laser sensor 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 LDM41E and LDM42E 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.

LDM41E and LDM42E Manual General
ASTECH GmbH Page 7
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.
Fast Ethernet port for input of measuring functions commands from, and
output of measured values to a PC or a PLC (Telnet connection)
Switching output with adjustable limit and hysteresis.
Measured values can be displayed in meters, decimeters, centimeters, 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 (LDM41E-h and LDM42E-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 (LDM41E-h and LDM42E-h)

Safety Instructions LDM41E and LDM42E Manual
Page 8 ASTECH GmbH
2Safety Instructions
2.1 General Safety Instructions
These safety and operating instructions should be carefully read and followed
during practical work with the LDM41E and LDM42E.
There is danger of Laser radiation or electrical shock. For necessary
repair work, the LDM41E and LDM42Emay 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 LDM41E and LDM42E.
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 LDM41E and LDM42E 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
Repair work on the LDM41E and LDM42E must not be carried out
by anyone other than authorized personnel.

LDM41E and LDM42E Manual Safety Instructions
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Refrain from using the LDM41E and LDM42E without certified
protection in an explosive environment
Measurement with the LDM41E and LDM42E 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 LDM41E and LDM42E 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.
Users are instructed by Laser warning sign (see Figure 2) to do not stare into
the beam. They have to protect themselves by turn the head and/or closing
the eyes and by avoid a long look into the beam.

Safety Instructions LDM41E and LDM42E Manual
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Do not direct the Laser beam onto persons.
The sensor can use without any additional safety protection.
2.5 Electric Supply
Use only 10 V to 30 V DC (direct voltage) for LDM41E and LDM42E operation.
Use only the specially designated connector terminal for voltage supply.
Specified signal levels must not be exceeded, in order to guarantee correct
data communication.
2.6 Important Operating Advice
To make full use of the system’s inherent performance capabilities and
achieve a long service life, you should always follow these operating rules:
Do not turn the module on if there is fogging or soiling on its optical
parts
Do not touch any of the module's parts with bare hands.
Proceed with care when removing dust or contamination from
optical surfaces!
Prevent shock impacts during transport and use of the LDM41E and
LDM42E
Prevent overheating of the LDM41E and LDM42E.
Prevent major temperature variances during LDM41E and LDM42E
operation
In accordance with IP65 internal protection standards, the LDM41E
an LDM42E is designed to be splash proof and dustproof.
Read these safety and operating instructions with due care and
follow them in practical use.

LDM41E and LDM42E Manual Technical Data
ASTECH GmbH Page 11
3Technical Data
Table 1 : Technical Data
Measurement range4
0.1 m up to 30 m with natural surfaces,
depending on target reflectance or reflectors
more than 100 m achievable5
Measuring accuracy6
2 mm under defined measuring conditions7
3 mm (+15 °C up to +30 °C)
4 mm in DS mode <0.5 m (+15 °C … 30 °C)
5 mm (-10 °C up to +50 °C)
Resolution8
0.1 mm, user scalable, standard 1 mm
Reproducibility
0.5 mm
Measuring time
0.24 to 6 s setup or auto Mode DT
0.1 s (10 Hz) mode DW at white surface
20 ms (50 Hz) mode DX at white surface
(only LDM42E)
Target motion speed
≤4 m/s in DX-Mode (LDM42E only)
Acceleration
≤2,5 m/s² in DX-Mode (LDM42E only)
Operating temperature
-10 °C up to +50 °C
-40 °C up to +50 °C (-h option only)
Storage temperature
-40 °C up to +70 °C
Supply voltage
10 V ... 30 V DC (protected against polarity
reversal)9
Power consumption
Depending on operation mode
< 2.5 W in Standby
< 3.5 W for distance tracking
< 24 W with heating active (-h option only)
Data interface
Fast Ethernet 10/100 Mbit
4
dependent on target reflectance, stray light influences and atmospheric conditions
5
e.g. 3M, self-adhesive foil white, non glossy
6
statistic spread 95 %
7
for measurement at a planar white target surface in continues movement or still standing, +15
up to +30 °C
8
dependent on target reflectance, stray light influences and atmospheric conditions
9
Please use only 24 V DC For devices with heating (LDM41E-h and LDM42E-h) The heater is
connected directly to the power supply.

Technical Data LDM41E and LDM42E Manual
Page 12 ASTECH GmbH
and for start-up and service a RS232, baud rate
9600 (2400..38400), ASCII, Format 8N1 (fix)
Digital switching output
„high-side-switch“, programmable switching
threshold and hysteresis, rated for max. load of
0.5 A, HIGH = UB - 2 V, LOW < 2 V
Digital input10
External trigger, trigger pulse 3 up to 20 V, pulse
length≥ 1 ms, start of measurement 5 ms +
trigger delay, trigger slope and delay can be set
(0 ms ... 9999 ms),
EMC
EN 61326-1
Shock resistance
10 g / 6 ms
Persistence shock DIN ISO 9022-3-31-01-1
Laser Class
Laser class 2, under EN60825-1:2007, Class 2
Wave length
650 nm (red visible)
Laser divergence11
0.6 mrad
Laser angle tolerance
Better than ± 1° to the ground plane
MTBF
30,000 h, 24/7, Operation temp +25 °C
Connector
12-pol. M18-male socket, Binder Serie 423
Dimensions (LxWxH)
212 mm x 96 mm x 50 mm
Mounting
100 mm x 85 mm, 4 x M6 holes
Weight
approx. 800 g
Protection class
IP 65 (spatter water and dust protection)
10
trigger function is not available for devices with internal heating (LDM41E-h and LDM42E-h)
11
at 10 m distance the beam diameter is 6 mm, at a distance of 50 m it is 3 cm and at a distance of
100 m it is 6 cm

LDM41E and LDM42E Manual Mechanical Mounting Conditions
ASTECH GmbH Page 13
4Mechanical Mounting Conditions
The casing consists of a rugged, corrosion-resistant extruded aluminum profile
with front-side and rear-side covers also in corrosion-resistant design. Four
mounting holes are provided in the base plate for mechanical attachment of
the LDM41E-h and LDM42E-h.
Figure 3 : Dimensional drawing
To protect the sensor’s optical surfaces from dust, physical contact,
mechanical impacts, etc., the casing has a protection tube attached to it.
Optionally different protection windows and optical filters are available.
Please note that measurement cannot be guaranteed to function correctly if
the equalizer tube is removed by unqualified action!
The interface connector is located on the back cover. Interface cables with
different length are available (standard 2 m, optionally 5 or 10 m).

Mechanical Mounting Conditions LDM41E and LDM42E Manual
Page 14 ASTECH GmbH
Figure 4 : Offset against zero-edge
The LDM41E and LDM42E’s zero-point is located 7 mm behind the outer
surface of the front cover or 137 mm before the back cover outside face
respectively. This zero-point has been introduced for constructional design
reasons. It can be compensated with the help of parameter “OF“ (see section
8.24 OF –display/set distance offset)

LDM41E and LDM42E Manual Electrical Connection
ASTECH GmbH Page 15
5Electrical Connection
5.1 Rear-Side Cover Terminals
Connector terminals are located on the rear-side cover of the device. The
terminals consist of 4 buses for metal circular plug-in connectors (from
Binder), or compatible connectors, sealed against the casing in compliance
with IP 65 requirements. This connector type guarantees optimised screening
and a high IP level.
The following connection plugs should be used:
Table 2 : LDM41E and LDM42E terminals
Quantity
Connector Type
Use
1
4-pin male cable connector
(series 715 D from Binder)
Fast Ethernet 10/100
1
5-pin male cable connector
(series 713 A from Binder)
RS232
1
5-pin female cable connector
(series 713 A from Binder)
Power supply, switching
output and trigger input
Note: Various connectors and cables are available. Please ensure that
only shielded connectors and shielded cables are used.
Ethernet
RS232
Power supply,
Output and
Trigger-Input
Figure 5 : LDM41E and LDM42E terminals

Electrical Connection LDM41E and LDM42E Manual
Page 16 ASTECH GmbH
5.2 Assignment of Terminals
Power Supply
The required power supply is 10 to 30 V DC.
The trigger input allows for a distance measurement via an external signal in
the form of a voltage impulse from 3 to 20 V (only DF mode, please see
Chapter 8).
Table 3 : Pin assignment power supply and trigger
Pin
Description
Colour
Comment
1
VCC
brown
Power supply 10 to 30 V
2
OUT
white
Switching Output
3
GND
blue
Power supply 0 V
4
CONFIG
black
do not use (for service only)
5
TRIGGER
gray
Trigger input 3 to 20 V (ground potential
GND)
Fast Ethernet
The LDM41E and LDM42E has a terminal for circular plug-in connectors (series
715 D for Ethernet from Binder) conforming to the relevant standards.
Table 4 : Pin assignment Fast Ethernet
Pin
Description
Comment
1
TD+
TD+, RJ45: 1 = white/orange
2
RD+
RD+, RJ45: 3 = white/green
3
TD-
TD-, RJ45: 2 = orange
4
RD-
RD-, RJ45: 6 = green
GND wires are connected to an internal collective ground point. They provide
the reference potential for all voltage values quoted below.
Note: Only use connection plugs and Ethernet cables that conform to
the relevant standards

LDM41E and LDM42E Manual Electrical Connection
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RS232 Serial Interface
Note: All commands in Chapter 8 are possible with the RS232 and
also with Ethernet (Telnet)! The use of RS232 can therefore usually be
avoided!
The RS232 interface was originally designed as a PC interface only. It has now
become the standard for serial data transfer for short distances. It is subject to
interference when used for longer distances, in particular, in environments
with interfering high-frequency electromagnetic radiance. As a result, this
interface should only be used for configuring the LDM41E and LDM42E. Please
configure using the programming cable and the LDMTool program.
Note: The receiving line of the RS232 serial interface of the LDM41E
and LDM42E is deactivated while connecting to the Telnet-client. If
the Telnet connection is terminated, the full use of the RS232 is again
possible.
Please observe the RS232 standard. The maximum extension of the
RS232 lines is 15 m.
Table 5 : Pin assignment RS232
Pin
Description
Colour
Comment
1
RxD
brown
Receiving line
2
TxD
white
Transmit line
3
GND
blue
Ground potential
Note: Following successful programming, remove the RS232 cable
and protect the RS232 cable connector with the enclosed sealing plug
against entry of dirt.

Electrical Connection LDM41E and LDM42E Manual
Page 18 ASTECH GmbH
Programming Cable
Connection to a PC requires the following cable with SUB-D 9 F connectors.
The TxD and RxD signals of the LDM41E and LDM42E and the PC connection
are crossed. The colours apply to the optional programming cable.
Table 6 : Pin assignment programming cable
Pin LDM 4xE
Description
Colour
Pin SUB-D 9 F
Description
1
RxD
brown
3
TxD
2
TxD
white
2
RxD
3
GND
blue
5
GND
5.3 Shield and Grounding
Cable shields must be grounded with low resistance. Only high quality shielded
cables should be used.
Carrier bases and control boxes should have equal potential. Potential
differences could lead to electrical currents and may cause EMC problems (no
correct measurement function or switching the gauge off or on is necessary).
If no potential equalization is possible, then mount the LDM41E and LDM42E
isolated from the carrier base (use nylon screws and washers). Connect the
screen with mass to the cable end. This way of assembly should also be used
when installing the LDM41E and LDM42E inside vehicles
Figure 6 : Isolated isntallation
.

LDM41E and LDM42E Manual Limiting Values for Voltages
ASTECH GmbH Page 19
6Limiting Values for Voltages
GND lines of the power supply and RS232 terminals are connected internally
and form the ground potential for all of the limiting values indicated below.
Input voltages:
Table 7 : Input voltages
Terminal point
Voltage
Comment
VCC
+10 up to +30 V
pole-reversal-protected
CONFIG
do not connect
reserved
TRIG12
± 25 V
short-circuit-proof
RxD
± 25 V
short-circuit-proof
Output voltages:
Table 8 : Output voltages
Terminal point
Voltage
Comment
OUT
like VCC (Ri135 mΩ)
max. 0.7 A load;
short-circuit-proof
TxD
±5.4 V
short-circuit-proof
Limiting values of voltages, loads and logical levels comply with relevant RS232
and Ethernet standards. All outputs are sustained-short-circuit-proof.
12
Trigger function is not available for devices with internal heating (option –h)

Start up LDM41E and LDM42E Manual
Page 20 ASTECH GmbH
7Start up
Make sure that all cable ends are protected against short circuit effects before
you turn on power supply!
Connect cable terminals as required for the particular operating mode. To
prevent short circuits, you should seal unused cable ends!
As part of preparative actions, the LDM41E and LDM42E must be properly
installed in the designated working site, oriented onto the target and kept in a
stable position. The target to be measured should preferentially have a
homogeneous, bright surface.
Caution: Do not use any retro reflectors!
The alignment of the LDM41E and LDM42E is facilitated by a Laser beam
13
that
is visible and can easily be turned on at the PC (e.g. command DT starting the
measurement and switch the Laser on, see 8.2).
7.1 Start up with RS232
For starting up, a PC with RS232 data interface or a USB converter for RS232
and a terminal program are required. We recommend the Windows program
LDMTOOL Version 4.0 or higher.
13
depending on ambient light and target conditions