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Device description 

LDS70A User Manual 

Page 16 

ASTECH GmbH 

 

4

 

Device description 

4.1

 

General information 

The  laser  distance  meter  LDS70A  is  designed  as  a  compact  range  finder 
dedicated  for  easy  integration.  It  provides  serial  data  interfaces  (RS232, 
RS422)  as  well  as  digital  and  analog  outputs.  The  housing  is  classified  IP  67. 
The  automatically  controlled  heating  element  ensures  the  operating 
temperature  of  the  components  and  free  optics  (no  condensation)  of  the 
LDS70A. 

4.2

 

Technical data 

Table 1: Technical data 

Measurement 

Measurement principle 

Laser pulse - Time of flight measurement 

Measuring range 
 

Total range 

 

On target board 

1) 2)

 

 

Onto natural surface, 80 % reflectivity 

1)

 

 

Onto natural surface, 10 % reflectivity 

1)

 

 

0.2 m … 270 m

 

0.5 m … 270 m

 

0.2 m … 125 m

 

0.2 m … 70 m

 

Measuring accuracy 

3)

 

±60 mm (single measurement, 1 σ)

 

Repeatability 

4)

 

±25 mm (1 σ)

 

Resolution 

1 

mm (decimal output ≤ 15 kHz)

 

Maximum measuring rate 

40 kHz 

Measurement modes 

Single, continuous, programmable auto-
start 

1)

 

Dependent on target reflectance, influence of extraneous light and atmospheric conditions  

2)

 

e.g. Scotchlite Cube 3000x  

3)

 

Accuracy can be ± 100 mm for close-up ranges up to 1 m. 

4) 

Repeatability ± 50 mm at measurement distances above 70 m. 

Laser 

Laser wavelength 

905 nm (invisible, near-infrared) 

Laser divergence 

2 mrad x 0.4 mrad 

Laser class 

Laser class 1, EN 60825-1:2014 

Содержание LDS70A

Страница 1: ...User Manual LDS70A Firmware Version 3 3X Version 1 1 ...

Страница 2: ...is product is subject to ongoing technological developments Editorial deadline April 2020 Firmware version 3 3 Manual version V 1 1 File Manual_LDS70A_EN_V1 1 docx Note Proper care has been used in compiling this document No liability will be accepted in the event of damage resulting from the failure to comply with the information contained herein ASTECH GmbH Schonenfahrerstr 5 D 18057 Rostock Int...

Страница 3: ...LDS70A User Manual Contents ASTECH GmbH Page 3 Revision History Manual Version Date Changes 1 1 02 04 2020 Revision of Figure 5 and some errors 1 0 04 02 2020 Created ...

Страница 4: ...ces 14 4 Device description 16 4 1 General information 16 4 2 Technical data 16 4 3 Laser beam image 18 4 4 Mechanical Installation 19 4 5 Electrical Installation 20 4 6 Status LED 21 4 7 Serial interface RS232 22 4 8 Serial interface RS422 23 4 9 Digital interfaces Q1 Q2 24 4 10 Analogue current output QA 25 4 11 Trigger 27 5 Parameter setup and measurement 29 5 1 General information 29 5 2 Trans...

Страница 5: ...ket pin page front view 21 Figure 3 Wiring with serial interface RS232 22 Figure 4 Wiring with serial interface RS422 23 Figure 5 Wiring of Q1 Q2 24 Figure 6 Wiring of QA 26 Figure 7 Wiring of trigger output 27 Figure 8 Wiring of trigger input 28 Figure 9 Analog output behaviour 42 Figure 10 Switching behavior of Q1 and Q2 45 ...

Страница 6: ...atus items 34 Table 5 Description of gain steps 37 Table 6 Binary output Maximum measurement frequency MFmax 39 Table 7 Decimal output Maximum measurement frequency MFmax 40 Table 8 Measurement window output behavior 41 Table 9 Mean value outcome 46 Table 10 Parameter SD Output encoding 47 Table 11 Output behavior on error 48 Table 12 Available termination chars 51 Table 13 Error codes 56 ...

Страница 7: ...of electric shock Sign warns against danger Sign shows information for use in hazardous environments Sign indicates important information regarding device use of the device The sign shows protection class 3 protective extra low voltage Sign indicates degree of protection IP of the device Sign informs that special guidelines had to be applied for device disposal ...

Страница 8: ...t and 2 digital outputs The LDS70A is characterized by very compact and rugged design easy mounting low power adjustable switching outputs and the ability to set user specific parameters This opens up a variety of uses in industrial applications Rapid process monitoring Position monitoring Level measurement Monitoring of object movements Positioning of cranes and loading equipment Measurement of i...

Страница 9: ...anger electric shock The LDS70A may only be opened for repair purposes by the manufacturer If the device is opened arbitrarily without authorization all warranty claims will expire The operating and storage conditions have to be observed see chapter 3 The inobservance of this advice and the adverse use of the device can lead to injuries of the user or to damage of the device Connectors may not be ...

Страница 10: ...osive environments otherwise there is the danger of damage to the LDS70A and the surrounding equipment and of injuries of the user 2 2 Advice for operating device The LDS70A should not be put into operation when optical parts are fogged or dirty The optical components of the equipment should not be touched with bare hands Dust and dirt are removed from the optical components with extreme caution C...

Страница 11: ...ater and short submersion Please observe the conditions for the protection degree IP 67 and observe especially the following advice The device must not be exposed to persisting driving rain or high temperature variations If the device is exposed to humidity the temperature difference between the device and the environment may be 5K maximum It is necessary to observe the operating and storage condi...

Страница 12: ...nces The following additional standards specifications were considered EN 60825 1 2014 IEC 60825 1 2014 Safety of Laser products Part 1 Equipment classification requirements and user guide Laser Class 1 2 4 Disposal For the disposal of the device special environmental protection guidelines apply Do not dispose the device with the usual domestic refuse The manufacturer offers to take back the devic...

Страница 13: ...tage Power consumption 3 W 3 2 Operating and storage conditions Operating temperature 40 C 60 C Storage temperature 40 C 70 C Air humidity 15 90 non condensing The mentioned operating and storage conditions have to be observed When the operating temperatures exceed the permitted values the device will not be switched off automatically The continuous overheating of the device will reduce the lifeti...

Страница 14: ...ults When measuring through optically transparent material use the function measurement window By using this function due to setting a fixed measurement range a wrong measurement caused by an optical medium in front of the laser may be avoided Please take care that the surface of the medium is clean and clear 3 4 Improperly use error sources The device may only be used when the safety advice descr...

Страница 15: ...nd storage of the device under conditions that do not conform with the specifications The operating temperatures have to be observed The overheating of the device has to be avoided in any case When the operating temperatures are exceeded the device is not switched off automatically Persisting overheating of the device leads to a reduced lifetime of the laser diode ...

Страница 16: ...f flight measurement Measuring range Total range On target board 1 2 Onto natural surface 80 reflectivity 1 Onto natural surface 10 reflectivity 1 0 2 m 270 m 0 5 m 270 m 0 2 m 125 m 0 2 m 70 m Measuring accuracy 3 60 mm single measurement 1 σ Repeatability 4 25 mm 1 σ Resolution 1 mm decimal output 15 kHz Maximum measuring rate 40 kHz Measurement modes Single continuous programmable auto start 1 ...

Страница 17: ...h Side switch max load 0 2 A Analog output 4 mA 20 mA programmable distance ranges Trigger 1x in out programmable delay Environmental Operating temperature 20 C 60 C without heating 40 C 60 C with enabled heating Storage temperature 40 C 70 C Humidity 10 90 non condensing Integrated heating Yes automatically controlled Mechanical Housing protection class IP 67 Shock Vibration DIN ISO 9022 3 Dimens...

Страница 18: ...distance In this sight the lenses of the RF70A are installed vertical above each other Table 2 Laser spot size Distance Laser spot Width Laser Spot height Footprint not true scale 0 2 m 14 mm 9 mm 1 m 14 mm 10 mm 5 m 15 mm 19 mm 10 m 17 mm 30 mm 20 m 19 mm 51 mm 70 m 32 mm 157 mm 150 m 52 mm 327 mm 290 m 87 mm 625 mm The above mentioned laser spot holds approx 50 of the entire laser energy An aura...

Страница 19: ...t with 2 screws M3 Bottom side with 4 screws M3 Small side right with 3 screws M3 The required length of the screws depends on the counter piece It is recommended to use screws with washer and ring washer Exact positions of the screws are shown in Figure 1 Mounting screws are not included in scope of delivery Figure 1 LDS70A dimensions ...

Страница 20: ...data 6 Yellow TX RS422 transmission data 7 Black Q2 Digital output Q1 8 Grey RX RxD RS422 receiving data RS232 receiving data 9 Red VDC Supply voltage 10 V 30 V DC 10 Violet TRIGIO Trigger signal IN OUT 11 Grey Pink QA Analogue current output 4 mA 20 mA 12 Red Blue GND Ground for interfaces QA RS232 Trigger The LDS70A provides inverse polarity protection Overvoltage protection is provided up to ma...

Страница 21: ...ol LED on the back panel near to the connector flange Following conditions will be indicated automatically The LED is flashing green during measuring without a failure The LED is flashing red if the device detected a critical failure during measurement which cannot be cleared automatically The LED lights permanently green if continuous measurement is inactive ...

Страница 22: ...or these baud rates we recommend to use the RS422 interface of the LDS70A VDC VDC TxD RxD GND D Sub9 2 3 5 RS232 RS232 brown blue white green pink yellow black grey red violet grey pink red blue shield 1 2 3 4 5 6 7 8 9 10 11 12 sh power supply 10 V 30 V DC Figure 3 Wiring with serial interface RS232 Before using the serial interface in RS232 or RS422 the correct wiring of Pin 3 white has to be ch...

Страница 23: ...to 300 m length is possible Use only high quality cable with 2 twisted pairs and shielding Pin 3 white of the connector decides which kind of serial interface active For RS422 the pin has to be connected to GND pin 12 red blue VDC VDC TX RX RS422 brown blue white green pink yellow black grey red violet grey pink red blue shield 1 2 3 4 5 6 7 8 9 10 11 12 sh power supply 10 V 30 V DC RS422 RX TX RS...

Страница 24: ...ed or fallen short of Thus they are ideally suitable for direct further processing of monitored values such as fill level or object detection Parameterization is done via the serial interface A load resistor of 150 Ohms 6 W max operating voltage of 30 V max load current of 0 2 A has to be switched against VDC GND of supply voltage The load current must not exceed 0 2 A Figure 5 Wiring of Q1 Q2 Typ...

Страница 25: ...ances by means of a two wire line The current of 4 20 mA impressed in the line is proportional to the measured distance within an adjustable distance interval Analogue output properties 4 mA 20 mA Indication in case of error 3 mA or 21 mA or last measured value 16 bit digital to analogue converter Max resolution for 4 20 mA range 15 bit If current voltage is to be converted there must be a load re...

Страница 26: ...r Manual Page 26 ASTECH GmbH VDC VDC brown blue white green pink yellow black grey red violet grey pink red blue shield 1 2 3 4 5 6 7 8 9 10 11 12 sh power supply 10 V 30 V DC Q1 QA 500 Ω 0 5 W GND 4 mA 20 mA Figure 6 Wiring of QA ...

Страница 27: ...e with parameter TI 2 Trigger output connection between two devices The output trigger signal of the 1 LDS70A parameterized with TO starts a single measurement DM of the second LDS70A parameterized with TO 3 Continuous distance tracking controlled by trigger VDC VDC brown blue white green pink yellow black grey red violet grey pink red blue shield 1 2 3 4 5 6 7 8 9 10 11 12 sh power supply 10 V 30...

Страница 28: ...ed blue shield 1 2 3 4 5 6 7 8 9 10 11 12 sh power supply 10 V 30 V DC TRIGIN 3 V 30 V trigger source Figure 8 Wiring of trigger input Voltage levels for the trigger signals Low level 0 V 1 5 V High level 3 V 30 V Threshold 2 25 V Hysteresis 0 1 V For correct parameterization of trigger input or output mode please refer to chapter 5 6 ...

Страница 29: ...rotocol Commands are case insensitive no differentiation between lower and upper case Decimal separator in the output of figures is the dot 0x2E The terminator of a command sending command is ENTER 0x0D 0x0A or Carriage Return 0x0D or Line Feed 0x0A Where parameters have several values they are separated by a space 0x20 The response to commands with parameters is the respective command including t...

Страница 30: ...ng a measurement operating mode Input COMMAND CR 0x0D Stopping a measurement continuous operating mode Input ESC 0x1B The set parameters are stored in the non volatile EEPROM immediately The last entered data will be available upon restarting 5 3 Identification ID Device identification information When entering the command ID the LDS70A will respond by displaying the device identification informat...

Страница 31: ...nter display set average value MW Enter MWx y z Enter display set measure window OF Enter OFx Enter display set distance offset SO Enter set current distance to offset SE Enter SEx Enter display set error mode Q1 Enter Q1w x y z Enter display set digital out Q1 Q2 Enter Q2w x y z Enter display set digital out Q2 QA Enter QAx y Enter display set analog out QA BR Enter BRx Enter display set serial b...

Страница 32: ...ending ESC Escape 0x1B The resulting output frequency is determined by the current setting of parameters SA averaging MF measurement frequency and SD output format Input DM Response Example for SD 0 3 D 0002 935 21 1 57 2 Output format decimal D Distance 2 935 m Signal quality 21 1 Temperature 57 2 C The output frequency of DT depends on the baud rate settings BR If the baud rate is to low not all...

Страница 33: ...parameters and measurements is shown All parameters are internal information regarding the hardware status changes are not possible Input HW Response Example Temp Board 45 0 C Laser voltage 25485mV Measure Result 0 The user of the LDS70A has to ensure that the stated ambient temperature operating temperature is adhered to If the allowed ambient temperature range is exceeded the will be no measurem...

Страница 34: ...o pulses PA Parameter overview In response to the query PA the LDS70A will send a parameter list with current settings Query PA Response Example measure frequency MF 500 max 40000 Hz average value SA 2 measure window MW 290 000 290 000 0 trigger in TI internal trigger trigger out TO rising edge distance offset OF 0 000 error mode SE 1 digital out Q1 0 000 1 000 0 050 1 digital out Q2 0 000 1 000 0...

Страница 35: ...offset OF 0 000 error mode SE 1 digital out Q1 0 000 1 000 0 050 digital out Q2 0 000 1 000 0 050 1 analog out QA 0 000 1 000 receiver gain GN 0 serial baud rate BR 115200 serial output format SD dec 0 value 0 unit for binary output UB 1000 000 serial output terminator TE 0Dh0Ah 0 autostart command AS DT select target ST 0 first recalibration timing TC 1 sec enabled DR Device reset sensor restart ...

Страница 36: ... HW ID ID MF MW OF PA PR Q1 Q2 QA SA SE SD TE TP Standard DT BR Baud rate BR enables the adjustment of the serial baud rate As soon as a new baud rate has been set the device will immediately start to communicate based on that new baud rate Adjust the baud rate of the connected receiver according to the new value of BR Query BR Set BRx Value range 9600 19200 115200 230400 460800 921600 1843200 200...

Страница 37: ... possible without an interface converter i e it will be impossible to reset the baud rate to a lower value without any auxiliary means GN Gain setup GN parameterizes the amplification of the receiver channel Table 5 Description of gain steps Value Description GN 1 Automatic control of amplification depending on the received light GN 0 Optimal amplifier setting for most applications GN 1 GN 3 Highe...

Страница 38: ...r second This is also the number of single distance measurements per second The achievable output frequency depends on the following terms of the setup Used interfaces e g serial interface RS232 or RS422 analog output length of the interface cable transfer speed baud rate average parameter SA data format of output value binary decimal parameter SD number of output values distance signal strength t...

Страница 39: ...nary output Maximum measurement frequency MFmax Output values Distance Distance signal quality Distance temperature Distance signal quality temperature Output data format SD 2 0 SD 2 1 SD 2 2 SD 2 3 Length of output data 2 3 3 4 Baud rate Maximum output frequency MFmax with SA 1 9600 470 300 300 220 19200 900 600 600 450 115200 5750 3800 3800 2880 230400 11600 7700 7700 5800 460800 23200 15500 155...

Страница 40: ...00 4750 4350 3300 2000000 12200 7850 6480 5000 MW Measurement window The measurement window defines the general distance boundaries for a successful measurement starting at distance x and ending at distance y The third parameter z sets the output value for the case that a successful distance measurement results outside the measurement window boundaries The measurement window function is useful for...

Страница 41: ...dow distance x x distance y distance y z 0 DE02 Measured value DE02 z 1 No output blanking pulse Measured value No output blanking pulse OF Offset OF parameterizes a user specific offset x which is added to measured distance value Query OF Set OFx Value range x Float32 resolution 0 001 1 mm 250 000 m 250 000 m Standard 0 000 Output OF 0 000 LDS70A does not perform a plausibility check of the prese...

Страница 42: ... the electric wiring see chapter 4 10 Figure 9 Analog output behaviour Query QA Set QAx y Value range x Float32 resolution 0 001 1 mm Value range y Float32 resolution 0 001 1 mm Standard 0 000 1 000 Output MW 71 000 71 000 0 LDS70A does not perform a plausibility check of the QA settings It is the responsibility of the user to set the correct parameters ...

Страница 43: ...ed as follows 𝑥 𝑦 𝑄𝐴 𝑚𝐴 4 𝑚𝐴 16 𝑚𝐴 𝐷𝑖𝑠𝑡 𝑥 𝑦 𝑥 𝑥 𝑦 𝑄𝐴 𝑚𝐴 20 𝑚𝐴 16 𝑚𝐴 𝐷𝑖𝑠𝑡 𝑦 𝑥 𝑦 Dist measured distance Please do not use the analog output for fast processes with high distance changes The typical settling time for jump from 4 mA to 20 mA is 40 µs The measurement window MW applies to the analog output as well ...

Страница 44: ...he measuring range the hysteresis y as well as the logic behavior z Query Q1 or Q2 Set Q1w x y z or Q2w x y z Value range w Switching threshold 9999 999 9999 999 Float32 resolution 0 001 1 mm Value range x Switching range 9999 999 9999 999 x 0 x y Float32 resolution 0 001 1 mm Value range y Switching hysteresis 9999 999 9999 999 y 0 Float32 resolution 0 001 Value range z Switching state 0 or 1 Sta...

Страница 45: ... Mean average SA parameterizes the number x of the single measured values to be averaged for one measurement SA directly correlates with the measurement frequency MF SA and MF determine the output frequency of the measured values Query SA Set Sax Value range x 32 bit integer resolution 1 Standard 1000 Output SA 1000 ...

Страница 46: ...1500 19 15000 100 150 6 15000 1000 15 2 Table 9 Mean value outcome For table above applies Measuring frequency 15 kHz and output frequency 15 kHz will be achieved with baud rate 921 600 and binary output All valid measured distance values will be used for SA If a distance value is out of the measurement window MW it will be ignored for the SA calculation SO Set offset SO carries out a single dista...

Страница 47: ...e user may select the output data encoding as well as the transmitted values Table 10 Parameter SD Output encoding n Output encoding 0 decimal 1 Not available 2 Binary m Output values 0 Distance 1 Distance signal quality not available for binary 2 Distance temperature 3 Query SD Set SDn m Value range n 0 1 2 Value range m 0 1 2 3 Standard 0 0 Output SD 0 0 ...

Страница 48: ...ty measurements as well as the state after carrying out a single distance measurement Table 11 Output behavior on error X Q1 Q2 z 0 Q1 Q2 z 1 QA 0 Last value Last value Last value 1 High Low 3 mA 2 Low High 21 mA Low U 1 V High U operating voltage 1 V The LDS70A does not perform a plausibility check of the preset error mode Query SE Set SEx Value range x 0 1 2 Standard 1 Output SE 1 ...

Страница 49: ...etected target first target target next to the LDS70A last target last detected target Output will be the distance of the defined target Parameter MW measuring window and SA mean value average will influence the output If the selected target will be outside of the range of measurement window the output will be not a distance value see setting of MW parameter z Query ST Set STx Value range x 0 firs...

Страница 50: ... a Measuring frequency of approx 35 kHz the calibration will be done without any influences of the output frequency Between 35 k Hz and 40 kHz it could be possible that the data output will interrupt for one 1 distance output every x seconds x parameter of TC TE Terminator Sets the termination char for the output of measured values in ASCII format see also command SD Query TC Set TCx Value range x...

Страница 51: ...e 12 Available termination chars X ASCII Hex Meaning 0 0x0D 0x0A CR LF 1 0x0D CR 2 0x0A LF 3 0x02 STX 4 0x03 ETX 5 0x09 HTab 6 0x20 Space 7 0x2C Single quote 8 0x3A Colon 9 0x3B Semicolon Invalid characters will be ignored The previously selected terminator will be maintained ...

Страница 52: ...gnal of the 1 LDS70A parameterized with TO starts a single measurement DM of the second LDS70A parameterized with TO 3 Continuous distance tracking controlled by trigger Differences between trigger input and trigger output Important is the parameter y of TI and TO TI y 0 TO y 0 Trigger input The measurement starts after an external trigger impulse TI y 0 TO y 0 Trigger output LDS70A sends a trigge...

Страница 53: ...for Autotrigger function 0 rising edge low high 1 falling edge high low 2 both rising and falling edge 3 start stop Autotrigger with rising edge 4 start stop Autotrigger with falling edge y delay Sets the time delay between trigger event and start of measurement in milliseconds Query TI Set TI x y Value range x 0 1 2 3 4 Value range y 0 to max 60 000 ms 1 minute active from 1 ms upwards disabled 0...

Страница 54: ...ntinuous distance tracking DT starts with the first rising edge of the trigger input signal The delay between the trigger event and start of measurement is 10 ms The next rising edge of the trigger input signal will stop the continuous distance tracking There is also a delay of 10 ms between trigger event and stop of measurement TO Trigger setup output The parameterization of trigger output will b...

Страница 55: ... from the measurement frequency The binary output is selected by the command SD Example UB 0 001 resolution 1 µm UB 1 000 resolution 1 mm The measuring range will be depicted with 14 signed bits Distance value binary Distance mm UB Distance range binary 8192 Distance 8191 Query UB Set UBx Value range x float32 resolution 0 001 Standard 1000 000 1mm per digit Output UB 1 000 If the distance value i...

Страница 56: ... codes Error code Description Reset DE02 No distance identified Automatically with the next measured distance DE04 Device error hardware Not automatically device reset necessary DE06 Temperature out of range Automatically if temperature returned to specified range DE10 Internal laser voltage lower than the defined minimum voltage ULaserMIN Not automatically device reset necessary In binary format ...

Страница 57: ...DS70A e g parameterizing reset or start of new measurement will be not influence by the error message If DT is started and the error did not reset automatically the error message will be outputted again The temperature check with command TP may be higher than the ambient temperature Approx 30 min after power ON the measured temperature could be higher than ambient temperature ...

Страница 58: ...ed EN 61326 1 2013 IEC 61326 1 2012 Electrical equipment for measurement control and laboratory use EMC requirements Part1 General requirement EN 50581 2012 Technical documentation for the assessment of electrical and electronic products with respect to the restriction of hazardous substances The following additional standards specifications were considered EN 60825 1 2014 IEC 60825 1 2014 Safety ...

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