Laser Astech Manual Model 41A
Contents
1. 14 5 1 Connector Terminal isidin 14 5 2 Interface Cable a ccacazis2 cccckacchasedsacdaecdoccdaccdeccdaaekecckeas 15 5 3 Shield and Grounding cceccceeeeeeeeseeeeeeeeeeeeeeees 16 5 4 Termination of RS 232 cccccccccccccsecceeeeeeeeeeeeeeeeeees 17 Limiting Values for Voltages ccccceeesseeecceeeeeeeeeeeneeeeeeeeeeneees 18 Stalup iss csnsnnnnhnnnn ions nnnnnnnsinnnnnnns 19 Commands and Parameter ccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeenees 20 Bide GONESral ssccadscdcscdedccdacbeecacacscdededeacdedededegedededededetatededeteds 20 8 2 DT diStanCetracking ccccccecceeeeeeeeeeeeeeeteeeeteeeeeees 22 8 3 DW distancetracking with cooperative target 10Hz 23 8 4 DxX distancetracking with cooperative target 50Hz 23 8 5 DF distance measurement with external trigger 23 8 6 DM distance measurement 0 cceeeeeeseeeeees 23 8 7 TP internal temperature C ccccccccccceceeeeeeeees 24 8 8 SA display set average value 1 20 0000000022 25 8 9 SD display set display format d h ccee 25 8 10 ST display set measure time 0 25 25 8 11 SF display set scale factor cceeeeeeeeteeees 26 8 12 SE display set error mode 0 1 2 000000000000 27 10 11 12 13 8 13 AC display set ALARM center ee 27 8 14 AH display set ALARM2. The LDM 41 42 A is a laser range finder 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 LDM 41 42 A performs depending on the reflectance morphology and qualities of the target to be measured The range finder works based on comparative phase measurement It emits modulated high frequency 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 LDM Laser beam meas beam Target 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 autostart 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 section chapter 8 of this User Manual General 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 c
3. 20 OF display set distance offset 13 Assignments of Connector and Interface Cable 5 Assignments of Connector and Interface Cable 5 1 Connector Terminal Located on the back cover is a connector terminal A 12 pole round type flange mount series 723 connector from Binder has been selected for this purpose It is sealed against the casing to comply with IP 65 requirements This connector type guarantees optimized screening and a high IP degree The required counterpart is a cable jack series 423 from Binder with grading ring Interface cable with different length are available standard 2 m optionally 5 or 10 m Under RS 232 C or RS 422 norm it s possible to extend the length with a high quality screened cable Figure 5 View of LDM 41 42 A pole assignments 14 Assignments of Connector and Interface Cable 5 2 Interface Cable Caution AN The cable end are exposed The user is responsible to take precautions that will prevent any kind of shorts The cable shield has to be connecting to earth with low resistance Figure 6 Interface cable with connector Interface cable wiring assignments are as follows Alarm TxD RX RXD RX GND TRIG VCC GND IOUT TX TX Shield Figure 7 Interface cable colour codes 15 Assignments of Connector and Interface Cable Pin Color Assignment Function RS 232 Function RS 422 A Green TxD RX RS 232
4. AH gt 0 ON AH lt O 2 Iout 20mA RE gt RB 4mA RE lt RB ALARM ON AH gt 0 OFF AH lt 0 AC Enter ACx x Enter display set ALARM center AH Enter AHx x Enter display set ALARM hysterese RB Enter RBx x Enter display set distance of Iout 4mA RE Enter REx x Enter display set distance of Iout 20mA TD Enter TDxx x Enter display set trigger delay 0 9999ms trigger level 0 1 BR Enter BRxxxx Enter display set baud rate 2400 38400 AS Enter ASdd Enter display set autostart command DT DW DF DM TP LO ID OF Enter OFx x Enter display set distance offset SO RAGE 46 004 48 2404 4 09 94 set current distance to offset offset distance EQ RAGE 6 0 65 4 wigs eiiiy espe laser on EF RAGE scare laser off PA LRARSE i ce signe sade are gree display settings PRIRAGSE 9 6 co4ig eae gem does reset settings Figure 10 Help text 20 Commands and Parameter All valid settings will be preserved on turning the LDM 41 42 A off They can only be replaced with new value entries or changed back to their standard values by running an initialization routine Command entries are not case sensitive This means that small and capital lettering can be used for commands Any command must be terminated by a hexadecimal ODh carriage return character Where decimal digits are to be entered they must be separated by period 2Eh For command parameter entries one must distingu
5. m it is 3 cm and at a distance of 100 m it is 6 cm 11 Mechanical Mounting Conditions 4 Mechanical 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 LDM 41 42 A 195 amp 2 ji i m i S JE au 48 i 212 nen X 16 lt 100 YY N mE a K AOR ed ps2 7 iy i h i r y r 8s Figure 3 Dimensional drawing To protect the range finder s optical surfaces from dust physical contact mechanical impacts etc the casing has a protection tube attached to it This tube can be extended or removed as necessary to meet the customer s operating needs Please note that measurement cannot be guaranteed to function correctly if the equalizer tube is removed by unqualified action 12 Mechanical Mounting Conditions The interface connector is located on the back cover Interface cable with different length are available standard 2 m optionally 5 or 10 m Figure 4 Offset against zero edge The LDM 41 42 A 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
6. send data RS 422 receive data B Yellow RxD RX RS 232 receive data RS 422 receive data C Brown TRIG External External trigger input trigger input D Red IOUT Analog output Analog output E Black TX RS 422 send data RS 422 send data F Violet TX RS 422 send data RS 422 send data G Orange VCC Supply voltage Supply voltage H White ALARM Digital switching Digital switching output output Grey GND Ground potential Ground potential Blue GND Ground potential Ground potential GND wires are connected to an internal collective ground point They provide the reference potential for all voltage values quoted below damage the LDM 41 42 A Do not connect the current output h Caution If input signals are applied to an output port this may IOUT red to the power supply 10 30 V This will destroy the interface board For data communication via RS232 you are recommended to use cable 4 grey GND for signal ground and cable 7 blue GND for supply ground The limiting values of voltages load rates and logic levels are in accordance with RS232 and RS422 standard requirements All outputs are protected against steady short circuit currents 5 3 Shield and Grounding The cable shield must be grounded with low resistance For cable extension use only high quality shielded cable Carrier base and control box should be have equal potential Potential differences are reason for electrical curren
7. SA Queries sets floating average value 1 20 SD Queries sets output format dec hex ST Queries sets time to measure 0 25 SF Queries sets scale factor SE Queries sets error mode 0 1 2 AC Queries sets alarm center AH Queries sets alarm hysteresis RB Queries sets beginning of range 4 mA RE Queries sets end of range 20 mA TD Queries sets trigger delay BR Queries sets baud rate AS Queries sets autostart OF Queries sets offset SO Sets current distance as offset LO Turns laser on LF Turns laser off PA Displays all parameter values PR Resets all parameters to standard values 35 11 Error Codes Error Codes Code Description Action Reflexes are too weak or Use white target board E15 distance from LDM front edge to or increase distance to target is less than 0 1 m target E16 Reflexes are too strong Use white target board or filter Too much steady light e g sun Use aperture or filter or E17 or reflexes are too strong white target board DX mode only LDM 42 A Use white target board or E18 reflexes too weak or distance increase distance to target from LDM front edge to target is less than 0 1 m E23 Inner temperature below 10 C Heading necessary E24 Inner temperature above 60 C Cooling necessary E31 EEPROM checksum Necessary to repair E51 Failed to set avalanche voltage Necessary to repair Excessi
8. User Manual LDM 41 42 A Version 1 3 CE Dear User You are advised to carefully read this User Manual before powering on the LDM 41 42 A laser distance measuring module 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 May 2005 Manual version V 1 3 3 Firmware version from 3 07 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 Content Content Generals cwctic te ete 5 Safety Instructions eee 7 2 1 Safety Instructions 1 0 0 0 cccceceeeeeeeeeeeeeeeeteneeeeeeeeeeees 7 2 2 Intended amp Conforming Use cccecseeeeeeeeeeeeeees 7 2 3 Nonconforming USe cccceeeeeeeeeeeeeeeeeeeeneeeeeeeeeeees 7 2 4 Laser Classification nseeeseeneeeeeeereereererrrrrrrrerrene 8 25 Electie SUPP tesescsaaectecctsccaeecccaacaceasecdenaecacaaacacaacaacecaees 9 2 6 Important Operating Advice cc ccceeeeetseeeteeeteeeeeeee 9 Technical Data ccceeeeeeeeeeee ee eeeeeeeeeeeeeeeeeeeeeeeeeeeeaaeeeneeeees 10 Mechanical Mounting Conditions cccccceeessseeeteeeeeeeees 12 Assignments of Connector and Interface Cable
9. adecimal h output format of measured value data SD affects all commands that output a distance value A hexadecimal output value is calculated from a given measured distance value in mm multiplied by the scale factor SF Hex Format lt SPACE gt xxxxxx lt CR gt lt LF gt x 0 F Negative distance values are output in two s complement notation Examples Distance 4 996 m SF1 dec 004 996 lt CR gt lt LF gt hex _001384 lt CR gt lt LF gt 4996 mm x SF1 Distance 4 996 m SF10 dec 049 960 lt CR gt lt LF gt hex _00C328 lt CR gt lt LF gt 49960 4996 mm x SF10 8 10 ST display set measure time 0 25 Measuring time is directly conditional on the selected measuring mode As a general rule one may say the poorer the reflectance of the surface of a particular target the more time the LDM 41 42 A will require to determine the distance with specified accuracy For example if error message E15 is output because of poor reflectance and insufficient time to measure this latter setting must be increased The available value range for measuring time is 0 to 25 Basically the greater the time setting is the more time will be available for measurement and the lower the resulting measuring rate 25 Commands and Parameter An exception there from is zero value In this case the LDM 41 42 A automatically picks the smallest possible time value for measurement The LDM 41 42 A comes factory set with ST 0 ST i
10. ance threshold is negatively or positively exceeded the alarm output will switch from HIGH to LOW or vice versa with a certain delay as set under alarm hysteresis AH see 9 3 Digital Switching Output 27 Commands and Parameter 8 15 RB display set distance of lout 4mA RB Range Begin defines the point of a distance range at which the analog output will begin to deliver varying distance readings At a distance of RB the output current will be 4 mA RB must be selected so it is properly matched to the currently valid scale factor SF setting RB can be smaller or greater than RE see 9 4 Analog output 8 16 RE display set distance of lout 20mA RE Range End defines the point of a distance range at which the analog output will cease to deliver varying distance readings At a distance of RE a current of 20 mA will be output RE must be selected so it is properly matched to the currently valid scale factor SF value RE can be greater or smaller than RB 8 17 TD display set trigger delay 0 9999ms trigger level 0 1 TD is only intended for the configuration of the remote trigger input see 8 5 DF mode TD consists of two sub parameters of the actual delay value i e the delay time and the trigger level Trigger delay corresponds to the time from arrival of the trigger signal to the starting point of a measurement It may be set to any value between 0 and 9999 ms With the help of the trigger l
11. d values to be stable ESC stops the measurement 8 5 DF distance measurement with external trigger Input parameter SA SD SE SF ST OF Output RS232 RS422 digital switching output analog output DF mode allows a measurement that is triggered by an external trigger pulse Initially after selecting this mode the operator does not receive any response As soon as the trigger pulse has been detected the LDM 41 42 A will send data and switches to digital and or analog output Settings for trigger delay delay and trigger slope can be defined via parameter TD see 8 17 TD display set trigger delay 0 9999ms trigger level 0 1 8 6 DM distance measurement Input parameter SA SD SE SF ST OF Output RS232 RS422 digital switching output analog output DM mode triggers a single measurement single shot 23 Commands and Parameter 8 7 TP internal temperature C TP queries the value of the inner LDM 41 42 A temperature Note In tracking mode the inner temperature may exceed the surrounding temperature level by as much as 10 K 24 Commands and Parameter 8 8 SA display set average value 1 20 SA allows you to calculate a floating average value from 1 to 20 measured values Calculation is based on this formula X1 X2 X3 Xn 20 Average value x n Standard setting is 1 8 9 SD display set display format d h SD switches between decimal d and hex
12. ead 95 5 for measurement at a planar white target surface in continues movement or still standing approx 20 C dependent on target reflectance stray light influences and atmospheric conditions 10 Data interface Digital switching output Analog output Trigger input EMV Shock resistance Laser Class Wave length Laser divergence Connector Dimensions LxWxH Mounting Weight Protection class Technical Data RS 232 RS 422 baudrate 9600 2400 38400 ASCII format 8N1 fix high side switch programmable switching threshold and hysteresis rated for max load of 0 5 A HIGH UB 2V LOW lt 2 V current output 4 mA up to 20 mA programmable distance range limits load resistance lt 500 Q accuracy 0 15 temperature drift lt 50 PPM C external trigger trigger pulse 3 up to 24 V length 1 ms start of measurement 5 ms trigger delay programmable trigger slope and trigger delay trigger delay can be set 0 ms 9999 ms EN 61000 6 2 und EN 55011 10g 6ms persistence shock DIN ISO 9022 3 31 01 1 Laser Class 2 under IEC825 1 EN60825 Class FDA21 CFR 650 nm red visible 0 6 mrad 12 pol M18 Binder series 423 212 x 96 x 50 mm 100 x 85 mm 4 x M6 holes ca 850 g IP 65 spatter water and dust protection 7 convertible conversion to be carried out by certified personnel 8 at 10 m distance the beam diameter is 6 mm at a distance of 50
13. ed to prevent the destruction of electronic components depending on ambient light and target conditions 19 Commands and Parameter 8 Commands and Parameter 8 1 General The easiest way to trigger and parameterize the LDM 41 42 A is by using a PC with RS232 communication port and a terminal program LDMTOOL or HyperTerminal The communications protocol is available in ASCII format Before an operating session begins desired parameter settings can be made in a smart selection procedure until the measuring module is optimally adapted to the particular measuring site conditions and the measuring job By selecting ID Enter command you may call up the menu with available setup commands LDM4x s n xxxxxx V 3 07 PT RAGE ccsiiod wig aeig eens distancetracking DW RAEOE 6 e606 were ee sm arm eee distancetracking with cooperetive target 10Hz DF RAGE amp osc ine were moose aw enous distance measurement with external trigger PM RAGEEM o 4 004 we ardor aw 2s distance measurement PP LEASE 44 604 die a0 gw internal temperature C SA Enter SAxx Enter display set average value 1 20 SD Enter SDxx Enter display set display format d h ST Enter STxx Enter display set measure time 0 25 SF Enter SFx x Enter display set scale factor SE Enter SEx Enter display set error mode 0 1 2 0 Iout const ALARM const 1 Iout 4mA RE gt RB 20mA RE lt RB ALARM OFF
14. evel one may define if measurement is to begin on a rising or a falling pulse slope Trigger delay and trigger level must be separated by space 20h in the entry line Standard setting 0 0 Example TD1000_60 Enter In the given example the delay has been set to 1000 ms and the trigger slope to rising LOW to HIGH transition 8 18 BR display set baud rate 2400 38400 Available baud rate settings are 2400 4800 9600 19200 38400 Faulty entries will be rounded to the nearest baud rate A fixed data format of eight data bits with no parity and one stop bit is used Standard setting is 9600 baud 28 Commands and Parameter 8 19 AS display set autostart command AS autostart defines which function will be carried out when power becomes available to the LDM 41 42 A Possible entries are those delivering a measured value on the output side an ID command or the command for turning the laser on LO For example if ASDT has been parameterized the LDM 41 42 A will begin with distance tracking on turning on power 8 20 OF display set distance offset With the help of OF offset the user may define a zero point for his her application For details on the position of the module s zero point refer to section 4 OF must be selected so it is properly matched to the currently valid scale factor setting SF OF may also take on negative values Standard setting 0 8 21 SO set current distance to of
15. from LOW to HIGH with decreasing distance if AC AH 2 was negatively exceeded Example AC AH 0 8 0 9 1 0 1 1 1 2 1 1 1 0 0 9 0 8 I I 3 I I I L 1m 0 2m 1m 0 2m H H H L L L L L H L Low H High How the switching output is to behave on occurrence of an error message E15 E16 E17 E18 can be defined by making suitable settings under SE 9 4 Analog Output The analog output is designed to allow normalized analog distance data transmission over greater length via a two wire cable Figure 16 Wiring diagram of analog output The analog output is designed to allow normalized analog distance data transmission over greater length via a two wire cable The current is proportional to the measured target distance This applies within a distance interval that is marked by the two limiting parameters Range Begin RB and Range End RE where RE may be greater or smaller than RB see 8 15 and 8 16 32 Interface connection The output current value is calculated according to this equation a _ Distanz RB RE gt RB IOUT mA 4 mA 16 mA RE RB wig ire a _ Distanz RE RE lt RB IOUT mA 20 mA 16 i RB RE If RB is negatively exceeded in RE gt RB direction or positively exceeded in RE lt RB direction by the actual distance value the analog output current will be 4 mA If RE is pos
16. fset offset distance SO performs a distance measurement and saves the measured reading as an offset value with inverted mathematical sign OF 8 22 LO laser on LO turns the laser on This function can be used for orientation or functional testing of the LDM 41 42 A 8 23 LF laser off LF turns the laser off 8 24 PA display settings PA lists all parameters in a table 8 25 PR reset settings PR resets all parameters except for baud rate After a new configuration of the LDM 41 42 A is necessary 29 Interface connection 9 Interface connection 9 1 Serial Interface RS232 Initially RS232 communication interfaces purely functioned as PC communication ports They have become the established standard tool for serial data transmission over short cable lengths With greater transmission lengths the interface is highly susceptible to interferences notably in the vicinity of strong electromagnetic noise emitters Therefore it should only be used for LDM 41 42 A configuration Figure 11 Diagram of RS232 wiring at 9 position D Sub cable jack 7 ogego0oogoo0000 Si9le oojo Soe eS Figure 12 Diagram of RS232 wiring at 25 pole D Sub cable jack 9 2 Serial Interface RS422 For configuration purposes and permanent data transmissions over a greater length the RS422 can be used This type of interface is insusceptible to interference and noise influences and qualifies for industria
17. ge to the LDM 41 42 A Cable connectors must not be plugged or unplugged as long as voltage is supplied Remember to turn voltage supply off before you begin working on cable connections 2 2 Intended amp Conforming Use Measurement of distances Special measuring functions Compliance with prescribed temperatures for operation and storage Operation at correct voltage level Application of specified signal levels to the appropriate data lines 2 3 Nonconforming Use Do not operate the LDM 41 42 A in any other way than described under Intended amp 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 LDM 41 42 A must not be carried out by anyone other than authorized personnel Safety Instructions Refrain from using the LDM 41 42 A without certified protection in an explosive environment Measurement with the LDM 41 42 A 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 in faulty measurement values 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 res
18. hysteresis 2 27 8 15 RB display set distance of lout 4mA 28 8 16 RE display set distance of lout 20mMA 28 8 17 TD display set trigger delay seeeeeeteeee 28 8 18 BR display set baud rate 2400 38400 28 8 19 AS display set autostart command 29 8 20 OF display set distance offset ceeeee 29 8 21 SO set current distance to offset 29 8 22 LO IASOP OMi daea 29 8 23 Bais laser Offendit a 29 8 24 PA diSplay settings eeeeeeeeeeeeeeeeeeeeeeeee 29 8 25 PR reset STINGS ih ees sania ahlananenabanahenabananenseansens 29 Interface connection ccceeeeeeeeeeeeeeeeeeeeeeeeseneeeeeeeeeeeeeeeneees 30 9 1 Serial Interface RS232 ccccccceeceeecseeeeeeeeeeeeentees 30 9 2 Serial Interface RS422 cccceccceecceeeeeteeeeeeeeeeettaees 30 9 3 Digital Switching Output Alarm 0 ceeeeeeeeees 31 9 4 Analog Output eeecceeceeeeeeeeeeeecteeeeeeeeeteenaaes 32 95 EMO GSM DUE cisco osooso o ESE 34 List of COMMANGS 6 oecccesesecccecececesesessecececeeetecatesscecececsteentstecetst 35 Eir r CodeS iicicces eck cei ex Pi vsdsestbecthestisaizcctbecttcatbestecedtecteeeteestbestes 36 PC Interface Cable Option cccsseecceeeeeeeeeeseeeeeeeeeeeeeeeseeees 37 Service and Warranty cc eeccceeeeeeeeesseeeeeeeeeeeeeeeseeeeeeeeeeennees 38 General 1 General
19. ish between parameter settings and parameter queries Querying is achieved with a command in simple format e g for alarm center parameters AC Enter For parameter setting a new value must be added after the command with no delimitation sign in between for example AC20 8 Enter In the given example the alarm center will be set to 20 8 The following is a short overview of the commands Command Description DT Starts distance tracking DW Starts distance tracking on white target at 10 Hz DX Starts distance tracking on white target at 50 Hz only LDM 42 A DF Starts remote triggered single distance measurement single shot DM Starts single distance measurement single shot TP Queries inner temperature SA Queries sets floating average value 1 20 SD Queries sets output format dec hex ST Queries sets time to measure 0 25 SF Queries sets scale factor 21 Commands and Parameter SE Queries sets error mode 0 1 2 AC Queries sets alarm center AH Queries sets alarm hysteresis RB Queries sets beginning of range 4 mA RE Queries sets end of range 20 mA TD Queries sets trigger delay BR Queries sets baud rate AS Queries sets autostart OF Queries sets offset SO Sets current distance as offset LO Turns laser on LF Turns laser off PA Displays all parameter values PR Resets all
20. itively exceeded in RE gt RB direction or negatively exceeded in RE lt RB direction by the actual distance value the analog output current will be 20 mA Example RB RE Om 2m 4m 6m 8m 10m 11m 2m 10m 4mA 4mA I8 mA 12 mA 16 mA 20 mA 20 mA IOUT mA 20 RE gt RB 4 dl d2 Distanz Figure 17 Output current diagram for RE gt RB and RE lt RB To match analog output behavior in the event of an error message E15 E16 E17 E18 appropriate settings can be made under SE 4 2 11 33 Interface connection 9 5 Trigger Input The trigger input is intended for triggering a distance measurement with an external signal that is applied as a voltage pulse between 3 V and 24 V Figure 18 Wiring diagram of trigger input It is for the user to specify a desired delay time and a pulse flank to be selected for synchronization see 8 17 Having done this he she must switch the LDM 41 42 A to trigger mode DF see 8 5 34 List of Commands 10 List of Commands Command Description DT Starts distance tracking DW Starts distance tracking on white target at 10 Hz DX Starts distance tracking on white target at 50 Hz only LDM 42 A DF Starts remote triggered single distance measurement single shot DM Starts single distance measurement single shot TP Queries inner temperature
21. l use Where twisted cable pairs are involved transmissions lengths up to 300 m can be handled 30 Interface connection Figure 13 RS422 wiring diagram Since a standard PC typically includes no RS422 communication port you require an RS422 interface card or an RS422 to RS232 converter for communication 9 3 Digital Switching Output Alarm With the help of a user selectable distance threshold the switching output can be set to monitor objects or conditions for positive or negative overstep 10 500mA Figure 14 Wiring diagram of digital switching output The output can supply up to 500 mA HIGH I I I LOW T AC AC Distanz gt Figure 15 Digital switching output behavior with positive and negative hysteresis Configuration settings to this end can be made in Alarm Center AC see 8 13 and Alarm Hysteresis AH see 8 14 Of decisive significance for the switching output s logic state is the mathematical sign of the hysteresis condition It can be used as a quasi inverter of the switching output In the case of positive hysteresis 31 Interface connection the output changes from LOW to HIGH condition with increasing distance if AC AH 2 was positively exceeded and from HIGH to LOW with decreasing distances if AC AH 2 was negatively exceeded In the case of negative hysteresis the output changes from HIGH to LOW with increasing distance if AC AH 2 was positively exceeded and
22. om optical surfaces Prevent shock impacts during and use of the LDM 41 42 A Prevent overheating of the LDM 41 42 A Prevent major temperature variances during LDM 41 42 A operation In accordance with IP65 internal protection standards the LDM 41 42 A is designed to be splash proof and dustproof Read these safety and operating instructions with due care and follow them in practical use 3 Technical Data Measurement range Measuring accuracy Resolution Reproducibility Measuring time Target motion speed Acceleration Operating temperature Storage temperature Supply voltage Power consumption Technical Data 0 1 m up to 30 m with natural surfaces depending on target reflectance or reflectors more than 100 m achievable 2 mm under defined measuring conditions 3 mm 15 C up to 30 C 5 mm 10 C up to 50 C 0 1 mm user scalable 0 5 mm 0 16 up to 6 s setup or auto mode DT or 0 1 s 10 Hz 20 ms 50 Hz mode DX at white surface only LDM 42 A 5 m s in DX Mode only LDM 42 A 2 5 m s in DX Mode only LDM 42 A 10 C up to 50 C 20 C up to 70 C 10 V up to 30 VDC depending on operating mode lt 0 4 W for standby lt 1 5 W for distance tracking mode DW at white surface or dependent on target reflectance stray light influences and atmospheric conditions s e g 3M self adhesive foil white non glossy 4 statistic spr
23. onsistently low power consumption of lt 1 5 W without Alarm Up to 30 m reach for distance measurement with potential for more than 100 m reach if additional reflectors 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 inches due to Option for remote triggering of a measurement from an external trigger device e g 3M self adhesive foil white non glossy Safety Instructions 2 Safety Instructions 2 1 Safety Instructions These safety and operating instructions should be carefully read and followed during practical work with the LDM 41 42 A There is danger of laser radiation or electrical shock For AN necessary repair work the LDM 41 42 A may 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 information contained in this Manual or nonconforming product usage may cause physical injury to the user or material dama
24. ows you to configure the behaviour of the digital switching output alarm and or the analog output following an error message E15 E16 E17 Depending on the particular LDM 41 42 A application environment error messages have to be handled in different ways Available setting options are 0 1 and 2 with the following effects in the case of an error SE Digital switching output Alarm Analog output 4 20 mA 0 Hold voltage level of latest valid Outputs current of latest valid measurement measurement Positive alarm hysteresis LOW RE gt RB Current 4 mA Negative alarm hysteresis HIGH RE lt RB Current 20 mA Positive alarm hysteresis HIGH RE gt RB Current 20 mA Negative alarm hysteresis LOW RE lt RB Current 4 mA 8 13 AC display set ALARM center AC corresponds to the distance on identification of which the switching output switches AC must be defined taking into consideration the currently valid scale factor SF value As soon as the predefined distance threshold is negatively or positively exceeded the alarm output will switch from HIGH to LOW or vice versa with a certain delay as set under alarm hysteresis AH see 9 3 Digital Switching Output 8 14 AH display set ALARM hysteresis AH sets the switching hysteresis of the switching output AH must be selected so it is properly matched to the currently valid scale factor SF As soon as the predefined dist
25. parameters to standard values 8 2 DT distancetracking Input parameter SA SD SE SF ST OF Output RS232 RS422 digital switching output analog output DT mode can be chosen for distance measurement of different kinds of surfaces varying reflectance In this type of distance tracking mode the LDM 41 42 A uses internal algorithms to continuously evaluate the quality of the laser radiation signal that is coming back This may cause longer measuring times in the case of poor reflectance or sudden jumps in distance The minimum time to measure is 160 ms the maximum time is 6 s If the measuring signal fails to reach a specified quality within six seconds an error message is output The time to measure may also be limited by setting the ST parameter to a desired value ESC stops the measurement 22 Commands and Parameter 8 3 DW distancetracking with cooperative target 10Hz Input parameter SA SD SE SF OF Output RS232 RS422 digital switching output analog output DW mode performs at a steady measuring rate of 10 Hz The selected object must have a white target board for measured values to be stable ESC stops the measurement 8 4 DX distancetracking with cooperative target 50Hz Input parameter SA SD SE SF OF Output RS232 RS422 digital switching output analog output DX mode performs at a steady measuring rate of 50 Hz The selected object must have a white target board for measure
26. ription applications connectivity details environmental conditions 38
27. rt circuit proof RX 14V short circuit proof RX 14V short circuit proof TRIG 25V short circuit proof Output voltages Terminal point Voltage Comment TxD 5 4V 5 V at 3 kQ load TX TX gt 2V differentially at 2 x 50 Q load Alarm gt VCC 2V level depending on VCC All outputs are sustained short circuit proof the power supply 10 30 V This will destroy the interface A Caution Do not connect the current output IOUT red to board 18 Start up 7 Start 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 For starting up a PC with RS232 or RS422 data interface and a terminal program are required We recommend the Windows program LDMTOOL Version 1 4 or higher As part of preparative actions the LDM 41 42 A 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 white surface AN Caution Do not use any retro reflectors Alignment of the LDM 41 42 A is facilitated by a laser beam that is visible and can easily be turned on at the PC Operating voltage supply must be connected to the corresponding ends of the interface cable A pole reversal protection is integrat
28. s effective in the DT DF and DM mode of operation The measuring time setting option can also be used to modify the measuring rate for example in order to restrict the data volume or for synchronization purposes The following sample time setting can only be regarded as providing an approximate value Measuring time ST 240 ms except ST 0 Example The target distance is 25 m but the target s reflectance is not ideal With a measuring time setting of ST 2 E15 will be output following measurement The user must increase the time to measure in this case 8 11 SF display set scale factor SF multiplies a calculated distance value with a user selectable factor for changes in resolution or outputs in a different unit of measure The scale factor may also be negative Standard setting is 1 The scale factor influence the output of measurement results Offset OF Alarm Centre AC Alarm Hysteresis AH Range Begin RB and Range End RE Scale factor Resolution Output Output Unit SF1 1mm 12 345 m SF10 0 1 mm 123 45 dm SF 1 0936 0 01 yard 13 500 yard SF3 28084 0 01 feet 40 501 feet SF0 3937 1 inch 4 860 100 inch SF 1 1mm 12 345 m digital and or analog output and offset must be matched i Note Following a change in the scale factor the settings for accordingly 26 Commands and Parameter 8 12 SE display set error mode 0 1 2 SE error mode all
29. t and can cause EMC 16 Assignments of Connector and Interface Cable problems no correct measurement function or switch off on of the gauge necessary Is no potential equalization possible mount the LDM 41 42 A isolated 3 from the carrier base use Nylon screwing and washers Use screened cable e g 10XAWG224CULSW remember to extend also the cable screen 1 Connect screen to reference potential of Uv on cable end 2 For integration with vehicles use this mounting Figure 8 Isolated Montage 5 4 Termination of RS 232 if not in use or with open terminal points Make sure you leave no data line end pai dl open It will be highly sensitive to yow lt e RXD interferences EMC manne A terminator circuit should be installed s GND when the RS 232 is unconnected This 3k 2 29F circuit must be provided by the customer see diagram on the left Figure 9 Recommended termination wiring for work with open RS232 Please keep the RS 232 norm The maximal cable length of the RS 232 is 15 m Use alternatively a RS 422 connection use shielded twisted pair cable maximum 300 m termination resistor 100 Q 17 Limiting Values for Voltages 6 Limiting Values for Voltages Input voltages Terminal point Voltage Comment VCC 30 V pole reversal protected TxD 13 2V short circuit proof RxD 25V short circuit proof TX 14V short circuit proof TX 14V sho
30. ults Rapidly changing measuring conditions are likely to falsify the result of measurement 2 4 Laser Classification The LDM 41 42 A is a class 2 laser product as stipulated in IEC825 1 DIN EN 60825 1 2001 11 and a class II product under FDA21 CFR Caution There is Class 2 Laser radiation Do not stare into beam Figure 2 Laser class 2 The Laser power is limited to 1 mW In the event of accidental short time laser exposure up to 0 25 s the human eye is sufficiently protected by its own eyelid winking reflex This natural reflex may be impaired by medication alcohol and drugs Although the product can be operated without taking special safety precautions one should refrain from directly looking into the laser beam Do not direct the laser beam onto persons Safety Instructions 2 5 Electric Supply Use only 10 V to 30 V direct voltage for LDM 41 42 A 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 optical parts with bare hands Proceed with care when removing dust or contamination fr
31. vely high laser Necessary to repair E52 current laser defect E53 Division by 0 Necessary to repair E54 PLL range Necessary to repair E55 Unknown error Necessary to repair E61 Faulty command Correct input Illegal parameter invalid Correct input E62 command E63 SIO parity error Check data transmission E64 SIO framing error Check data transmission k e g 3M self adhesive foil white non glossy 36 12 PC Interface Cable Option i SUB D 9 F PC Interface Cable Figure 19 RS 232 cable with power supply for LDM 41 42 A No SUB D9F Colour code Designation SUB D 9 F PC COM Shield Cable shield 3 brown TxD 2 white RxD 5 blue GND Pin LDM 41 42 A Colour code Designation LDM 41 42 A RS 232 Shield Cable shield A white ALARM B green TxD RX J yellow RxD RX C grey GND D brown TRIG E orange or pink VCC F blue GND G red IOUT H black TX L violet TX A Please use only high quality shielded cable RS 232 Cable TxD and RxD are necessary to cross 37 Service and Warranty 13 Service and Warranty In relations with our Customers and Distributors we grant a two year warranty period for this product In the event of necessary repair work before or after these scheduled dates you should carefully pack your LDM 41 42 A and send it back to your sales agent Please stating all relevant operating conditions error desc
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