Laser Astech Manual
Contents
1. 2400 to 38400 format 8N1 fixed programmable switching threshold and hysteresis high side switch rated for max load of 0 5 A dependent on target reflectance steady light influences and atmospheric conditions 3 typical measuring accuracy under average conditions within specified measuring range you should consult the Manufacturer or your local distributor dependent on target reflectance steady light influences and atmospheric conditions at 10 m distance the beam diameter is 6 mm at a distance of 100 m it is 6 cm 7 convertible conversion to be carried out by certified personnel Analog output Trigger input Eye safety class Wavelength Dimensions L x W x H Weight Internal protection class Performance Data 4 mA to 20 mA current output programmable distance range limits load resistance lt 500 Q accuracy 0 15 Temperature drift lt 50 PPM C external triggering 5 V pulse height trigger flank adjustable trigger delay adjustable laser class 2 under DIN EN 60825 1 2001 11 650 nm visible 182 mm x 96 mm x 50 mm 850 g IP 65 Working Principle 4 Working Principle The LDM 40 A works based on comparative phase measurement To achieve this it emits visible laser beams in different frequencies The target being measured returns diffusely reflected light that is subsequently compared with a reference signal Finally a microprocessor uses the recorded phase shift to calculate a2. 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 7 Limiting Values for Voltages Input voltages Limiting Values for Voltages Terminal point Voltage Comment VCC 30 V pole reversal protected TxD 13 2 V short circuit proof RxD 25V short circuit proof TX 14V short circuit proof TX 14V short circuit proof RX 14V short circuit proof RX 14 V short circuit proof TRIG 25 V short circuit proof Output voltages Terminal point Voltage Comment TxD 54V 5V 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 Caution Do not connect the current output IOUT to the power supply 10 30 V This will destroy the interface board Starting Up 8 Starting Up Protect all cable ends against short circuit effects before you turn voltage supply on Necessary cable connections must be established in accordance with table specifications on the previous page You require a PC with corresponding data interface port and a terminal program to perform start up of the LDM 40 A For starting up the LDM 40 A needs to be installed at the measuring site aligned until pointing to a desired target and kept stable in this positio
3. Transmission Protocol 11 Transmission Protocol ASCII string Completion Description ID Enter ODh Calls up a list of commands DT Enter ODh Starts distance tracking DF Enter ODh Distance measurement mode with remote triggering DM Enter ODh Single distance measurement DW Enter ODh Starts distance tracking with white target TP Enter ODh Inner temperature C SA Enter ODh Sets displays time to measure 0 25 SE Enter ODh Sets displays error mode SF Enter ODh Sets displays scale factor AC Enter ODh Sets displays alarm centre m AH Enter ODh Sets displays alarm hysteresis m RB Enter ODh Sets displays distance m for lout 4 mA RE Enter ODh Sets displays distance m for lout 20 mA TD Enter ODh Sets displays trigger delay ms and trigger level BR Enter ODh Sets displays baud rate 1200 38400 AS Enter ODh Sets displays Autostart command OF Enter ODh Sets displays distance offset LO Enter ODh Turns the laser on LF Enter ODh Turns the laser off PA Enter ODh Displays parameter PR Enter ODh Resets parameter 25 12 Error Messages Error Messag es Code Description Action Reflexes are too weak or distance Use target board or E15 between LDM 40 A front edge increas
4. 28084 1 inch 52 979 100 inches SF0 3937 Alarm Centre AC Alarm Centre corresponds to the distance threshold of the switching output Alarm Centre is input in meters On negative or positive excession of the pre set switching threshold the alarm output will switch from High to Low or vice versa depending on the alarm hysteresis setting High corresponds to about VCC 1 V Low to 0 V Alarm Hysteresis AH Alarm Hysteresis defines the response hysteresis of the switching output Alarm Hysteresis settings are made in units of a meter The value of a hysteresis setting corresponds to the delay in switching in m its mathematical sign describes the logic level Range Beginning RB Range Beginning corresponds to the lower range limit of the analog output Range Beginning settings are made in units of a meter Range Beginning corresponds to a current of 4 mA The value of RB must be lower then RE Parameters Range End RE Range End corresponds to the upper distance limit of the analog output Range End settings are made in units of a meter Range End corresponds to a current of 20 mA The value of RE must be greater then RB Caution When setting the parameters RB and RE one must follow the rule that RB lt RE In any other case the state of the analog output will be in an undefined state Trigger Delay TD Trigger Delay consists of two sub parameters the actual delay i e the wait
5. Alarm hysteresis AH Digital switching output Range Begin RB Analog output Range End RE Analog output Trigger delay TD External triggering Baud rate BR All serial communications Autostart AS Behaviour on turning the LDM 40 A on Distance offset OF Distance measurement Error Mode SE Distance measurement Mean Value SA For a specified range the mean value is obtained as follows X1 X2 X3 Xn 20 Mean value x ____ n Distance Value Output Format SD For output of measured distance values decimal D or hexadecimal H output mode can be selected The output mode has an influence on all commands that display a distance value Hex format lt SPACE gt xxxxxx lt CR gt lt LF gt x 0 F 1 mm resolution SF1 Negative numbers two s complement Error Exx lt CR gt lt LF gt Dist 34 56789 m SF 1 output 008708 lt CR gt lt LF gt Dist 34 56789 m SF10 output 05464F lt CR gt lt LF gt Parameters Time to Measure ST The time to measure is directly conditional on the measuring technique As a general rule for target surfaces with poorer reflectance the LDM 40 A takes longer to determine the distance with a given specified accuracy With poor reflectance and too small a time to measure an error message E1 51 may be output among other possibilities You should increase the setting for time to measure in this case The range of available time to measure value
6. switching output alarm and or the analog output following an error message E15 E16 E17 Depending on the particular LDM 40 application environment error messages have to be handled in different ways While errors must be detected in some applications they may be ignored in others In order to provides an error management option for users an SE parameter error mode has been implemented in firmware version 1 04 and following Available setting options are 0 1 and 2 with the following effects in the case of an error SE Digital switching output Analog output 0 Hold voltage level of latest valid Outputs current of latest valid measurement measurement Positive alarm hysteresis LOW Output current value 4 mA Negative alarm hysteresis HIGH Positive alarm hysteresis HIGH Output current value 20 mA Negative alarm hysteresis LOW 21 Functions 10 Functions Command for Distance Measurement Function Command Meaning Distance DM single distance measurement Measurement Distance Tracking DT continuous distance measurement Distance Tracking DW continuous distance measurement for White Target 10 Hz Distance Tracking DF continuous distance measurement with Trigger with trigger synchronisation Please use this command for the Autostart Command e g ASDT Distance Measurement DM Starts a single distance measurement Distance Tracking DT Star
7. the switching threshold hysteresis 2 Example AC AH 0 8 0 9 1 0 1 1 12 1 1 1 0 0 9 0 8 m m m m m m m m m 0 2m L L L H H H 02m H H H L L L FI CT L low H high with distance increasing from left to right 23 Functions Analog Output The analog output allows a standardised long distance transmission of analog distance data with the help of a two wire cable The level of current which is output to this cable is proportional to the measured distance value within a distance interval that is defined by Range Beginning and Range End The output current value in mA can be calculated according to this equation IOUT 4 mA 16 Pan Value Range Begin Js Range End Range Begin Where these calculation rules would results an output current less than 4 mA or more then 20 mA the corresponding limit value i e 20 mA and 4 mA will be output Example RB RE Om 2m 4m 6m 8m 10m 11m 2m 10m 4mA 4mA 8 mA 12 mA 16 mA 20 mA 20 mA Remote Triggering This function allows distance measurement to be triggered with an external signal in the form of a 5 V voltage pulse The user may configure a desired delay time and a pulse flank he she wants to use for triggering see section gt Trigger Delay TD Having done this he she must switch the LDM 40 A to remote triggering mode 24
8. RM ONQAH gt 0 OFFQAH 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 x 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 OF Enter OFx x Enter display set distance offset LOIEREST acidceaseeweriene 4 laser on FEET Ieee are ne eee ee laser off org cane ean cade owe ea display settings PRIERCEE 2 4 cock ceras ogeans reset settings This allows you to optimally match the measuring module s performance to a particular measuring site environment and sighting task which is achieved by intelligent parameterisation before measurement actually begins Your parameter setup will be preserved after the LDM 40 A has been shut down They can only be changed by selecting a new value or initialising the standard parameter set 16 Parameters Parameter Abbreviation Relevance Distance DW Distance measurement tracking Mean value SA Distance measurement Output format SD Distance measurement Time to ST Distance measurement measure Scale factor SF Distance measurement Alarm centre AG Digital switching output
9. UT Current output Current output 9 black TX RS 422 send data RS 422 send data 10 violet TX RS 422 send data RS 422 send data 12 Interface Cable Wire Assignments The GND wires are internally combined to serve as reference potential for all voltage values specified below If data transfers are accomplished via RS 232 we recommend using cable 4 grey GND as signal ground and cable 7 blue GND as supply ground The limiting values for voltages load rates and logic levels are identical with those specified for RS 232 or RS 422 operation All outputs are sustained short circuit proof 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 the same potential Potential differences are reason for electrical current and can cause EMC problems no correct measurement function or hang of the gauge Is no potential equalization possible mount the LDM 40 A isolated from the carrier base use Nylon screwing and washers Termination of RS 232 if not in use or with open terminal points Make sure you leave no data line end 2 green open It will be highly sensitive to Sko 2 2nF interferences EMC S yelow A terminator circuit should be installed 4gray _ j 4 when the RS 232 is unconnected This circuit must be provided by the customer LDM 40 A see diagram on the left
10. Use caution when removing dust or soiling from optical components Prevent exposure to shock impacts during transportation and operation Prevent overheating of the module Do not expose the module to direct sun radiation while it is stored in a motor vehicle The LDM 40 A is splashproof and dustproof as required under IP 65 internal protection standards Safety Instructions The LDM 40 A laser distance measurement module is a class 2 laser product under DIN EN 60825 1 2001 11 Warning There is class 2 laser radiation when the cover is removed Do not look into the beam Performance Data 3 Performance Data Measuring range Measuring accuracy Meas value resolution Repeatability Measuring time Laser divergence Operating temperature Storage temperature Shock resistance Supply voltage Power consumption Data interface Digital switching output 0 2 m up to 30 m with natural surfaces more than 100 m achievable depending on target reflectance 2 mm under defined measuring conditions4 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 or 0 1 s 10 Hz on white surface 0 6 mrad 10 Cto 50 C 20 C to 70 C 10g 6ms persistence shock DIN ISO 9022 3 31 01 1 10 V to 30 V direct voltage depending on operating mode lt 0 4 W for standby lt 1 5 W for distance tracking RS 232 RS 422 baud rate
11. User Manual LDM 40 A Version 2 5 Dear User You are advised to read this User Manual carefully before you start using the LDM 40 A laser distance measurement module This is necessary to ensure that you will be able to utilise all the capabilities which your new acquisition provides This technology is subject to continuously ongoing development Editorial deadline August 2004 Manual Version V2 5 LDM 40 A Firmware Version V1 04 NOTE Appropriate care was used in compiling this document No liability will be accepted in the event of damage resulting from a non compliance of the information that is contained herein Table of Contents Table of Contents Ws Generaludmusasdesat kes T ene nest 4 2 Safety InStructionS rrsvrnnavnnnnnvnnnnnnnnnvnnnnnvnnnnnnnnnnnnnnnnennnnnnnnnnnnnner 5 3 Performance Data rrrnnnnvnnnnnnnvnnnnnnnvnnnnnnnnnnnnnnnnnnnnnnnnennnnnnnennnnnnnenr 7 4 Working Principle sudtlmslvekgiidgikemmeieiilmstesinitueime 9 Br SOTO ease hed cece ssse dock soak ce E de driste satsene 10 6 Interface Cable Wire Assignment rsnrnnnnnnnnnvvnnnnvnnnnnnnnnnnnnnnnenr 12 Shield and Grounding asrvnonvvnnorrvnnnrrnnnnvnnnnnnnrnrrnnnnrnnnnnnnnrnnennn 13 Termination Of RS 232 rannvnnenvvnrnrrrnnnvnnnnnvnnenvenrsrresnnrnnsnnnerenne 13 7 Limiting Values for Voltages rrnrssvvnnnnnnvnnnnnnnvnnnnnnnvnnnnnnnvennnnnner 14 Bs Starting UP una E e aen aa aeaa aara pa aaae a Saona issued 15 9 Pa
12. e distance and target lt 0 1 m E16 Reflexes are too strong Use target board or filter E17 Too much steady light e g sun Use filter or orifice E23 Temperature below 10 C Use heating E24 Temperature above 50 C Use cooling E31 EEPROM check sum error Service necessary E51 Setting of Avalanche voltage is not Service necessary possible E52 Laser current to much or Laser is Service necessary defect E53 Division by Zero Service necessary E54 PLL out of range Service necessary E55 Unknown error Service necessary E61 Illegal command Please correct input E62 SIO parity error Check data transfer E63 SIO overflow Check data transfer E64 SIO framing error Check data transfer 26 13 PC Interface Cable Option i SUB D 9F PC Interface Cable RS 232 cable with power supply for LDM 40 A No SUB D 9F Colour code Designation SUB D 9 F PC COM Shield Cable shield 3 brown TxD 2 white RxD 5 blue GND No LDM 40A Colour code Designation LDM 40 A RS 232 Shield Cable shield 1 white ALARM 2 green TxD RX 3 yellow RxD RX 4 grey GND 5 brown TRIG 6 orange or pink VCC 7 blue GND 8 red IOUT 9 black TX 10 violet TX Please use only high quality shielded cable 27 Service and Maintenance 13 Service and Maintenance To ensure that all functions are regularly checked and your LDM 40 A operates faultlessly over a long period of ti
13. f any greater length or with no tube at all In the event of unqualified tube removal measurement can no more be warranted to function correctly The back cover contains a gland seal port for the interface cable 2 m in length as required by IP 65 standards Where local conditions necessitate a greater distance between the actual measuring location and the PLC PC voltage supply the interface cable can be extended with a extra shielded cable 3 please get in touch with your contact person may deviate from interfacing specifications Interface Cable Wire Assignments 6 Interface Cable Wire Assignments Caution The cable ends are uncovered It s the user s responsibility to prevent shorts The cable shield must be grounded with low resistance Interface cable wiring assignments are as follows Alarm TxD RX RXD RX GND IRIG E VCC GND IOUT TX TX Figure 3 Interface cable colour codes No Colour Designation Function if RS 232 Function if RS 422 code 1 white ALARM Digital switching Digital switching output output 2 green TxD RX RS 232 send data RS 422 receive data 3 yellow RxD RX RS 232 receive data RS 422 receive data 4 grey GND Ground potential Ground potential 5 brown TRIG External External synchronisation synchronisation 6 orange VCC Supply voltage Supply voltage or pink 7 blue GND Ground potential Ground potential 8 red IO
14. ing time and the trigger level Delay corresponds to the time from the point when a trigger signal is received to the moment at which a measured value is output It may take on maximum value of 9999 ms The trigger level allows you to define if measurement is to be triggered at a low high flank 0 or a high low flank 1 Your selections for trigger delay and trigger level must be separated by space 20h see gt 11 Transmission Protocol Baud Rate BR For baud rate the following settings are available 2400 4800 9600 19200 38400 Faulty inputs are automatically rounded to the nearest available baud rate The data format is fixed It includes eight data bits no parity and one stop bit Autostart AS Allows you to define a function which the LDM 40 A is to carry out when voltage supply becomes available Possible inputs are Any function that outputs a measured value and ID command For example if ASDT has been parameterised the LDM 40 A will start with distance tracking immediately after power is available 20 Parameters Distance Offset OF With the help of this parameter the user may conveniently define a zero point of his her measuring setup LOND Receiver optics Figure 4 Front edge of LDM 40 A Zero point of the LDM 40 A OF 0 000000e 00 coincides with the front edge of the receiving lens Error Mode SE SE error mode allows you to configure the behaviour of the digital
15. itching output and analog output are separately programmed and with different parameters Adjustable distance barrier with hysteresis sets switching output Measured values are displayed in meters decimetres centimetres feet inches etc due to free scaling Option for remote triggering of measurement from external trigger device 3M Type 3270 3290 5290 Safety Instructions 2 Safety Instructions These safety and operating instructions should be carefully read and followed during operation and handling of the LDM 40 A For repair work the LDM 40 A may not be opened by anyone other than Manufacturer personnel or expressly authorised and duly instructed persons Please note that dangerous high voltage and laser radiation is present in the inner product space 1 There is danger from laser radiation or electrical shock Compliance with the prescribed operating conditions is necessary Failure to observe advice or information contained herein or non conforming usage of the LDM 40 A may cause physical injury to operating personnel or material damage to the measuring module To operate the LDM 40 A use only 10 V to 30 V direct voltage supply in all cases Important operating advice To be able to fully utilise the system s capabilities you should strictly follow these rules Do not operate the module if there is fogging or contamination on optical parts Do not touch the module s optical parts with bare hands
16. me you are advised to have the LDM 40 A laser distance measurement module inspected at our location at annual intervals If a repair becomes necessary you should carefully pack and send the LDM 40 A to our local dealer 28
17. n The target should preferentially have a homogeneous white surface UN Caution Do not use any retro reflectors Alignment of the LDM 40 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 integrated to prevent the destruction of electronic components 10 depending on ambient light and target conditions Parameters 9 Parameters A comprehensive set of LDM 40 A configuration functions can be triggered at the PC This variety provides the user with a broad range of potential applications By selecting ID Enter command you may call up the menu with available setup commands LDM 40 s n xxxxxx V 1 04 DELERESE sranrrabse ce eerie ee distancetracking DW EAHterf o sreresksekseesee distancetracking with cooperetive target 10Hz DF IRD E kerin sede eepaaus distance measurement with ext trigger DM PS ass pira distance measurement TP LENGE doe Saar ekke Mae Gag 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 ALARM OFF AH gt 0 ONQAH lt 0 2 Iout 20mA ALA
18. rameters inisee iriernne aeaea erR En aF Aei aA AEAT E Neea S EREE ia 16 10 FUnctions ierisinde aana eana aa ei 22 Command for Distance Measurement ranrnnnrnnrnnnnvnnnnnrnnrnnnnrr 22 Output and INpUt ieren iiaii aiaiai 23 11 Transmission Protocol ssrennnnnnvnnnnnnnvnnnnnnnvnnnnnnnnnnnnnnnnnnnnnnnnneenr 25 12 Error Messages srunnnnnnvnnnnnnnvnnnnnnnvnnnnnnnvnnnnnnnvnnennnnnnnnnnnnnnnnnnnnnnnenr 26 13 PC Interface Cable Option s errnnnnvnrennnnvnnennnnvnvennnnnnnernnnnnnenr 27 13 Service and Maintenance nnssrnnnnvnnnnvnnnnnvnnnnnnnnnvnnnnnnnnnnnnnnnnnnnnner 28 1 General General The LDM 40 A laser distance measurement module is designed for mobile and stationary distance measurement Particular features are Operation under extreme outdoor temperatures with high accuracy and great reach Great range of operating voltages 10 V to 30 V from on board vehicle supply a direct voltage industrial supply net or a DC power pack Small stable power consumption lt 1 5 W without laarm Long distance measurement and more than 100 m reach with additional reflectors mounted onto target depending on reflectance and environmental conditions Simple sighting with visible laser beam Flexible extendible interface cable for voltage supply bi directional data interface switching output and analog output Input of commands for available measuring functions and output of measured readings via PC or laptop Sw
19. required distance with mm accuracy LDM 40 Laser beam meas beam Target Figure 1 Working principle A distance measurement can be triggered in different ways manually at the PC with terminal program automatically after parameterisation of Autostart command continuously by selecting distance tracking mode remotely controlled with external triggering For a description of these trigger options refer to gt sections 9 Parameters and gt 10 Functions of this Manual Setup 5 Setup The laser distance measurement module is shipped together with an interface cable about 2 m in length and a User Manual in a padded cardboard box which can also be used for safe transportation of the LDM 40 A p 6 6 4x Figure 2 Technical drawing Tube at front cover Casing Gland seal for interface cable in back cover Receiver optics Transmitter optics Holes for mechanical attachment four Interface cable NIDIA A JOIN Setup The casing consists of a robust non corroding continuously cast aluminum part with front and back cover also non corroding The base plate contains four holes for mechanical attachment of the LDM 40 A To protect the optical components from dust physical contact mechanical impacts etc a choke is fixed to the casing Depending on the customer s request the LDM 40 A may be shipped with a tube o
20. s is 0 to 25 Please note the greater the selected value the greater will be time to measure and the smaller the measuring frequency An exception is 0 value If set to 0 the LDM 40 A automatically determines the minimal time to measure The LDM 40 A comes with measuring time set to zero ST 0 In addition the user may configure a desired measuring frequency via the time to measure for example in order to limit the amount of data or for synchronisation purposes The time to measure can approximately calculated using this equation Time to measure ST 240 ms except ST 0 Example The distance to be determined is 25 m The target s reflectance is not ideal If ST 2 is selected for time to measure E15 will be output You should choose a greater time to measure value in this case 11 see gt section 12 Error Messages Parameters Scale Factor SF The scale factor multiplies a calculated distance value with a user selectable factor to change resolution or to switch the output to a different unit of measure The scale factor setting has an influence on the output of the measured value the distance offset OF the Alarm Centre AC the Alarm Hysteresis AH the Range Beginning RB and the Range End RE Resolution Numerical Unit of Scale factor measure measure 1mm 134 567 m SF1 0 1mm 1345 671 dm SF10 0 01 Yard 147 162 yard SF1 0936 0 01 feet 441 493 feet SF3
21. ts the continuous distance measurement rate see parameter ST ESC stops the measurement Distance Tracking for White Target DW For a constant measuring rate of 10 Hz a white target board must be affixed to the target ESC stops the measurement Distance Tracking with Trigger DF Starts the continuous distance measurement mode The beginning of every measurement is synchronously to the input TRIG see gt Parameter Trigger delay TD ESC stops the measurement 22 Functions Output and Input Digital Switching Output Alarm The purpose of the digital switching output is to allow monitoring of targets or scenes for positive or negative edge of a user parametrizable distance threshold ka gt gt gt 4 i I lt ee s ee gt Figure 5 Alarm hysteresis positive Figure 6 Alarm hysteresis negative Configuration is performed by choosing appropriate settings for Alarm Hysteresis and Alarm Centre The logic state of the switching output essentially depends on the mathematical sign of your hysteresis setting If the setting for hysteresis is positive the output will switch to high on positive edge of the switching threshold hysteresis 2 and to low on negative edge of the switching threshold hysteresis 2 If the setting for hysteresis is negative the output will switch to low on positive edge of the switching threshold hysteresis 2 and to high on negative edge of
Download Pdf Manuals
Related Search