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Laser Measurement sensor users manual

1. 2 2 GENERAL DESCRIPTION visssccsccssccscvesdcsccacessccescssecssesstecessedssssensseesstecsdceusedeseccsssscccesevesssssuessnessedecssssssseescecested 4 2 1 PRINCIPLES OF QPERATION scedsaeescgeataes 4 2 2 IMEGHANICALMDIMENSIONS 6 2 3 INSTALLATION AND 7 3 OPERATING GUIDELINES sessssssesessevcaconsossesonsescsscossosvsevieniesossscsvccusessssesseuseeeceewsssonseesuoesderseseuen coosedsessecensentoeses 8 4 INSTALLATION AND CHECKOUT csccsssscssssssssscscccsssssssccssccsscsssscsncceecsessssssceccesesssscsceccceccscsscececesccesoes 9 4 1 CABLING 9 4 1 1 Standalone aiao aaie oee a AER Na 9 4 1 2 Connection 10 4 Host EaR 9 4 2 POWER ON 9 4 3 VERIFYING OPERATION ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssessessssssssssssseseessssesssssssssesssesssssessnesens 10 4 4 TROUBLESHOOTING cssssssssssssssssssssssssssssssssssssssssssssesscsesssescsesceseceeesessseesceseceeeseeseeeeseeseesesesseseeeeeeeeenees 10 4 4 1 Serial Communications CHECK wiccccccccccccsscccccccccccsssesccccccccccuseceecccescuussesceececcceussesecccceseuuuacscesscessuassecceeees 10 4 4 2 Range Output
2. 11 5 SIGNAL AND POWER INTERFACE ccccsssscsssssscsscscccsssscenccccccesssssscencccccsssssscececcesscsssscecccsssscssscccesessees 12 5 1 WIRE POWER AND SIGNAL CABLE ccccccccececececececececececececececececececececececececececececececececececececececececececececeeeeess 12 Jalal Power and Signal Cable Wire 12 6 SERIAL INTERFACE SPECIFICATION ccccccscsssssccsscssccsssssescccccesssscecccccessssssececcessesssccececcsescssssececcesces 15 6 1 HARDWARE PORT cccccocscscecscscosecccsvacscccntececccovssedscncssescdsnscasscetececcsenstecssecsnessderscesdcsiscsdsceteceddsesssecsdsnscessceees 15 6 1 1 FLOW CORIO 2 ccesseossesrinosonneaseinisedsnssumespnavoneiensootesstdotseasepeduosgupedut eatedyeie sel duoseasedntseas 16 6 1 2 FLOW Controles e a n SER NEA EE EE ESA e NE EENS 16 T SERIAL DATA FORMATS cesccsccsssccsccccescssccstscsecscets sscsovseca costes secs seuscecssesesncecbeesessesbevcisecsesdocdocs cosecssdensssuceseesvee 17 7 1 OUTPUT DATA FORMATS A abd cee dekh 17 7 1 1 AS CH Data EERE E 17 7 1 2 Binary Data 17 8 ANALOG OUTPUT MODES vississscsesisstesonssssenossacsosossesssocsessesoouessnsosdevdatessossasoutesbadosvoasovesseesasnssoseesesssetssonde
3. Note The funtion button may be released any time after the start of a flash and before the start of the next flash The changes will not be permanent unless a Write command 9 flashes is given before turning off the power Example To set the baud rate to 2400 baud press and hold the function button and wait for the LED to go out and then flash 7 times Release the button The LED will stay out indicating that a parameter value should be entered Press and hold the button until the LED has flashed 4 times Release the button The LED will flash 7 times pause flash 4 times and the baud rate will be set to 2400 11 3 Command Quick Reference One byte commands are shown below as ASCII Code lt Commandcharacter gt Multiple byte commands are shown as ASCII Code lt Commandcharacter gt lt lt Parametername gt gt AR200 User s Manual 23 Rev 2 1 Acuity If the command may be entered using the switch the number of LED flashes for that command is given The notation Serial Entry Only indicates that the command cannot be given using the function button Bracketed numeric parameters are optional Terminating a command without entering an optional numeric parameter will cause the sensor to use the presently measured distance for the parameter Since high resolution entry is not possible with the switch as an input device distance parameters can only be set to the value being measured when the command is pro
4. Acuity Laser Measurement AccuRange 200 Laser Displacement Sensor User s Manual Rev 2 1 For use with AR200 Rev 1 06 August 26 2008 Acuity A product line of Schmitt Measurement Systems Inc 2765 NW Nicolai St Portland OR 97210 www acuitylaser com AR200 User s Manual Rev 2 1 Acuity Limited Use License Agreement YOU SHOULD CAREFULLY READ THE FOLLOWING TERMS AND CONDITIONS BEFORE OPENING THE PACKAGE CONTAINING THE COMPUTER SOFTWARE AND HARDWARE LICENSED HEREUNDER CONNECTING POWER TO THE MICROPROCESSOR CONTROL UNIT INDICATES YOUR ACCEPTANCE OF THESE TERMS AND CONDITIONS IF YOU DO NOT AGREE WITH THEM YOU SHOULD PROMPTLY RETURN THE UNIT WITH POWER SEAL INTACT TO THE PERSON FROM WHOM IT WAS PURCHASED WITHIN FIFTEEN DAYS FROM DATE OF PURCHASE AND YOUR MONEY WILL BE REFUNDED BY THAT PERSON IF THE PERSON FROM WHOM YOU PURCHASED THIS PRODUCT FAILS TO REFUND YOUR MONEY CONTACT SCHMITT INDUSTRIES INCORPORATED IMMEDIATELY AT THE ADDRESS SET OUT BELOW Schmitt Industries Incorporated provides the hardware and computer software program contained in the microprocessor control unit and licenses the use of the product to you You assume responsibility for the selection of the product suited to achieve your intended results and for the installation use and results obtained Upon initial usage of the product your purchase price shall be considered a nonrefundable license fee unless prior written waivers are obtained from Schm
5. Shield Ground at Supply End The multifunction output wires can be used for 4 20 mA current output 0 10V voltage output NPN sinking limit switches or PNP sourcing limit switches Wire 4 20mA Function in Selected Analog Mode 0 10V NPN LS PNP LS Orange Current Loop Voltage Output NPN 1 sink PNP 1 source Brown Current Loop RTN Voltage RTN NPN 2 sink PNP 2 source The serial communications lines can be used for RS232 Function in Selected Serial Mode Wire Yellow Green RS 232 RxData TxData 5 1 1 Power and Signal Cable Wire Descriptions Wire Color Red Function 15V power at 90 mA 110mA max with Current Loop 390mA max with Limit Switches Max noise and ripple 100mVpp Power supplies from 12 to 30VDC may be used Higher voltages will result in excessive current drawn by the over voltage protection circuitry and may cause permanent damage Voltages less than 12 VDC at the cable end may result in inaccurate range readings AR200 User s Manual Rev 2 1 The maximum current draw will increase depending on the analog output mode selected In the current loop and voltage output mode it will increase 20mA In the limit switch modes it will increase up to 300mA In the limit switch mode the majority of the power will be dissipated in the load connected to the AR200 Wire Color Black Function Ground Return for the 15V S
6. Note This command is intended for use when automatic sampling is turned off If automatic sampling is turned on the current distance measurement is terminated and distance measurements are restarted with the present sample interval See Also Set Sample Interval AR200 User s Manual Rev 2 1 39 Acuity Laser Measurement Show Configuration Length 5 bytes ASCII Code 1234 Function Button Code Serial Entry Only The characters V1234 entered in sequence will cause the firmware revision number of the sensor the Schmitt Measurement Copyright and the user configuration settings to be output Example To display the firmware version number enter V1234 Sample Output of Factory Settings FIRMWARE VERSION 0 01 06 Copyright 1999 Schmitt Measurement Systems INC ZERO POINT IS SET TO 0 SPAN IS SET TO 50000 SAMPLE INTERVAL IS SET TO 10000 ANALOG OUTPUT MODE IS CURRENT LOOP BACKGROUND LIGHT ELIMINATION IS ON CONTINIOUS SAMPLING IS ON BAUD RATE IS SET TO 9600 SERIAL OUTPUT IS ASCII ENGLISH SAMPLE PRIORITY IS QUALITY Note If data is being output when this command is used the configuration data will appear between samples The argument 1234 is required to prevent accidental output during data transmission The versionring is in ASCII regardless of the Serial Output data
7. of increasing current The current loop output is two lines The return line of the loop is connected to ground inside the sensor 8 2 Voltage Output AR200 User s Manual 18 Rev 2 1 In 0 10V voltage mode the analog lines will deliver a voltage which increases linearly from OV at the zero point to 10V at the span point The zero range point the starting distance and the span point of full scale output may be set anywhere within the measurement range of the sensor See the Set Zero Point and Set Span Commands In the default configuration the voltage output is updated 5 times per second This may be increased or reduced with the Set Sample Rate Command using either the pushbutton on the back of the sensor or the 5 command over the serial port Best accuracy and noise immunity is obtained by connecting a 10KQ resistor to the voltage return wire at the measurement point The default configuration is for calibrated output with the zero point at zero distance and the span at full scale The minimum voltage output span is 5 of the full measurement distance of the sensor Attempts to set a smaller span will be ignored and the span will not be changed Setting the span to a value closer that the previously set zero point will reverse the direction of increasing voltage output Acuity Laser Measurement The voltage output is two lines The return line is connected to ground inside the sensor 8 3 NPN Limit Swit
8. the AR200 Command Set section provides information on setting up the AR200 for specific application requirements The remaining sections deal with specifics of the outputs and with general performance characteristics of the sensor 11 Quick Start Instructions Mount the sensor in such a way that the case is not twisted or warped Using three hard points along the front and back edges or a slightly compliant mounting system are the best methods Do not clamp or squeeze the sensor case excessively If the case is distorted the sensitivity and accuracy of the sensor may be affected Connect the red and black Ground wires of the power signal cable to a 12 to 30 volt power supply 15 volts is suggested for best power efficiency or plug in the power supply if the sensor came with one 1 1 1 Analog and Limit Switch Signals In 4 20mA analog output mode the orange wire is the current output and the brown wire is current return These may be connected to a resistor such as 500 ohms to get a 2 to 10 volt signal or connected to a current meter In 0 10V analog output mode the orange wire is the voltage output and the brown wire is current return These may be connected to a resistor 1 3K ohms or larger to get a 0 to 10 volt signal In NPN limit switch output mode the orange wire is limit switch 1 output and the brown wire is limit switch 2 output When the switch is active the output will sink up to 150mA to the black Ground wire
9. the serial line and transmits measured distance over the current loop output if installed with the same update rate The current loop should put out 4 mA at zero range and 20 mA at full span Check either or both signals to verify basic sensor operation 4 4 Troubleshooting AR200 User s Manual 10 Rev 2 1 The sensor displays simple error indications using the LED on the end cap Trouble shooting steps are shown below Symptom Possible Cause Correction LED never turns on Power lines not connected Power lines reversed polarity Power supply voltage too low or too high Check wire connections Check wire connections Check power supply voltage when loaded No laser light and no range data Sampling is turned off Power supply voltage is too low Ambient light level is too high Turn Sampling on Check power supply input voltage Reduce the ambient light level LED flashes continuously at 1Hz rate Messages are continuously transmitted over the serial port See section on nonvolatile memory for more detail Configuration data lost Calibration data lost Press function button factory default configuration is loaded Call Acuity for instructions 4 4 1 Serial Communications Check If no information is received over the serial port check the power supply and serial cable connection The sensor may in a configuration that prevents serial communication s
10. J lt LimitPoint gt 1 lt LimitPoint lt 50000 Function Button Code Serial Entry Only This command sets the first limit point for analog NPN or PNP mode outputs to the value specified The value entered is the fraction of the full scale range times 50 000 If no numeric parameter is entered or the switch is used to enter this command the zero point will be set to the presently measured distance Example To set the Limit 1 point to the middle of the sensor s measurement range enter J25000 lt CR gt 0 5 x 50 000 25 000 Note The J command Limit 1 must be set after Z Zero point The J and K commands Limits 1 and 2 respectively both accept zero as a valid parameter although this value will never trip the limit If the Z parameter is not zero then the J and K values entered are relative to the zero point and subject to the span direction The J and K commands without parameters use values determined as if Z is zero The limit will be offset by the amount of the zero point and the limit point will be subject to the span direction See Also Set Span Set Limit Switch Directions AR200 User s Manual 28 Rev 2 1 Acuity Set Limit 2 Length 1 6 Default J1 ASCII Code K lt LimitPoint gt 1 lt LimitPoint lt 50000 Function Button Code Serial Entry Only This command sets the second limit point for analog NPN or PNP mode outputs to the value specified The value entered is the fr
11. When the switch is not active the output will be high AR200 User s Manual 1 Rev 2 1 Acuity Laser Measurement AR200 User s Manual 2 2 1 impedance and no current will flow through it These outputs may be connected through resistance to a voltage between the supply and ground The resistance should be chosen such that the outputs sink no more than 150mA In PNP limit switch output mode the orange wire is limit switch 1 and the brown wire is limit switch 2 output When the switch is active the output will source up to 150mA through the red wire When the switch is not active the output will be high impedance and no current will flow through it These outputs may be connected through a resistance to a voltage between the supply and ground The resistance should be chosen such that the outputs source no more than 150mA 1 1 2 Serial Data Wires The serial data wires may be connected to a standard PC port if the serial LED indicates RS 232 mode The output from the sensor may be viewed with a terminal emulator such as Windows HyperTerminal When power is applied the function LED on the sensor will light and if a target surface is placed in the measurement range of the sensor the sensor will print distance to the target from the start of the measurement range in inches 5 times per second If there is no target in the measurement range the sensor will output zeros or occasional random readings if outside light
12. closer from the zero point to the span point U lt Z If no numeric parameter is entered or the switch is used to enter this command the distance for the full scale current loop and voltage loop output will be set to the presently measured distance If a parameter is entered it is interpreted as the absolute distance from the start of the sensor s physical measurement range not the distance from the zero point set using the Set Zero Point command Example To set the L2 trip point maximum current loop and voltage loop output at the middle of the sensor s measurement range enter U25000 lt CR gt 0 5 x 50 000 25 000 To reverse the current loop and voltage loop output or serial output over the full sensor measurement range enter 5000000 lt gt Other than causing this reversal of direction in the serial data this command does not affect the serial output Note To set the current loop or voltage loop maximum output to the presently measured distance the sensor should be operating and pointed at a stationary target The minimum span is 5 of the sensor s full scale span If the absolute distance entered for the current loop or voltage loop maximum output results in a span less than 5 of the full scale span the command is ignored and the span is not changed If the zero point is subsequently changed with Set Zero Point the full scale distance position will change by the same amount so that the span is pre
13. the eyes without sensation or warning Do not attempt to disassemble the sensor Improper disassembly will destroy the optical alignment of the sensor and necessitate factory repairs Do not operate the sensor in areas where the sensor case is exposed to direct sunlight for extended periods or where the air temperature is more than 50 C 122 F or less than 10 C 14 F Avoid excessive vibration and shocks The sensor contains securely mounted but precisely aligned optical components Do not scratch the windows on the front face of the sensor particularly in the central area Keep the front windows clean with a damp cotton cloth The windows are glass with an anti reflection coating Avoid the use of cleaning solvents other than alcohol Operate only with DC supply voltages between 10 and 30 volts unless the sensor came with an AC to DC power supply 4 Installation and Checkout 4 1 Cabling The AR 200 has a multipurpose cable with soldertail wires If the AR200 is ordered with a power supply the power signal cable will be connected to the power supply Connection and termination according to the instructions is essential for correct sensor operation Read the wire descriptions for connection information 4 1 1 Standalone Cabling To use the AR200 without a serial connection to a host computer the only connections necessary are the power ground line and the analog output connection to your data display or recording equ
14. 0 User s Manual 5 Rev 2 1 Acuity 2 2 Mechanical Dimensions The following page shows the mechanical dimensions for the AR200 The rectangular window on the front panel is the collection point for return light should have a clear path to the target throughout the full measurement span The sensor has two 4 M3 clearance holes for mounting the sensor One face of the sensor has output selection pushbuttons The top of the sensor has a Function button The cable is for power and communication both serial and analog limit switch Weights are shown on the data sheet at the back of the manual The outer case of the sensor is anodized aluminum The front windows and the end caps are sealed to the case creating a dustproof splash proof enclosure Mechanical Dimensions 2 Mounting Holes M3 4 through 3mm 120 Dia 9mm 34 Axis Laser amp Camera Window 54 mm 2 13 FED ap ype MODEL S BLK lt 12 30 VDC MUDEL NO E AR 200 6 Open Buttons Enabled ELU 0 VDC Buttons Disabled M AR 200 12 WHT Open LASER Enabled M AR 200 25 0 VDC LASER Disabled W AR 200 50 YEL YEL R GPN 120 pall YEL Beal A on RS 422 RS 485 Term RS 485 RS 232 ornc omne BMS RED 1 2 BRN BRN Be onno EEN 4 20 0 10 VDC NPNLS PNP LS Acuity COMPLIES WITH 21 CFR CE 1040 10 AND EN60825 1 2001 2 8 mm 20mm 11 80 Figure 2 Mechanical Dimensi
15. 0000 50000 U50000 5 samples second S2000 Current Loop On X1 On L1 On H1 Command Name Set Baud Rate Write Configuration Data Read Configuration Data Serial Output Control Initialize Configuration Factory Defaults Set Sample Priority Set Serial Output to ASCII Serial Entry Only Set Serial Output to Binary Serial Entry Only Take Single Sample Serial Entry Only Show Configuration Serial Entry Only AR200 User s Manual Rev 2 1 Length 2 bytes 5 bytes 1 byte 2 bytes 1 byte 2 bytes 1 byte 1 byte 1 bytes 5 bytes Command Code ASCII Code B lt BaudRateCode gt BaudRateCode 1 300 2 1200 3 2400 4 4800 5 9600 6 19200 7 38400 8 57600 9 115200 Function button code 7 lt BaudRateCode gt ASCII Code W1234 Function button Code 9 ASCII Code R Function button Code 10 ASCII Code A lt Mode gt Mode 1 English Gnches 2 Metric mm 3 off Function button code 11 lt Mode gt ASCII Code I Function button Code 12 ASCII Code P lt Mode gt Mode 1 Quality 2 Rate Function button code 13 lt Mode gt ASCII Code D ASCII Code N ASCII code E ASCII Code V1234 25 Default Setting 9600 baud 5 English Al Rate P2 ASCII Output 11 4 Command Descriptions Following is a full description of each command s usage factory setting and effects The notation Ser
16. 1 English inches 2 Metric millimeters 3 off Function Button Code 11 lt Mode gt This command sets the serial output to On with English units inches On with Metric units millimeters or Off Example To turn off serial output enter A3 Note There is no indication on the ASCII serial output that the data is in English or Metric Units Serial Output control only affects data sample output Other serial output error messages or configuration output is not affected by this configuration parameter There is no unit information for Binary Serial Output output in Binary Serial Output is in units of 1 50 000 of the sensor s physical measurement range AR200 User s Manual 36 Rev 2 1 Acuity Initialize Configuration Factory Defaults Length 1 byte ASCII Code I Function Button Code 12 This Command restores the operating configuration to the original factory defaults May be used if the present state is unknown or inconvenient Example To initialize configuration to factory defaults enter Note This initialization is NOT saved to nonvolatile memory The Write command must be used to make this initialization permanent The configuration may also be set to the factory settings by holding the push button down on power up The LED will stay off until the button is released and the factory configuration will be loaded AND saved to nonvolatile memory See Also Write Configur
17. COMMAND QUICK REFERENCE cssccecssscecesssscecsesececseceecessaeeecsaaaeeeceneeecsesaeeecsesuececseaeeeseaaeeecsesaeesseeeeeensaes 23 11 4 COMMAND DESCRIPTIONS c0sssssssssessssssssssssssssssssssessssssseseseesecesssesssseseecsseseeeeseeseeseeeeseeseseeseeeseesesseseeesees 26 12 MAINTENANCE OF LASER SENSOR cssssccssssscccssssecscssscccssssccsessceccsensccscssacccensccesenscescsssacesessseeces 40 13 SHEET SUMMARY OF SPECTFICA TIONG ssscccsssssssssssccsssssccssssecccsssccscesseccscssseccscssscccsssscccessceece 40 AR200 User s Manual ii Rev 2 1 Acuity Laser Measurement 1 Introduction This section is a guide to getting started with the AR200 and this manual The AR200 has a number of configurable parameters but many applications can use the sensor in its default factory configuration The recommended order for reading the manual is e Quick Start Instructions General Description Operating Guidelines e Installation and Checkout using the Power and Interface section as a reference This should provide the information necessary to connect the sensor and verify its operation either with a serial terminal program at 9600 baud or by connecting the current loop interface To understand more about the serial configuration options read the Serial Communications chapter For details on the current loop voltage and limit switch outputs read the chapter titled Analog Output For custom configuration
18. ENSE IS AUTOMATICALLY TERMINATED TERM The license is effective until terminated You may terminate it at any other time by returning all hardware and software together with all copies of associated documentation It will also terminate upon conditions set forth elsewhere in this Agreement or if you fail to comply with any term or condition of this Agreement You agree upon such termination to return the hardware and software together with all copies of associated documentation In the event of termination the obligation of confidentiality shall survive 12 MONTH LIMITED WARRANTY EXCEPT AS STATED BELOW IN THIS SECTION THIS PRODUCT IS PROVIDED AS IS WITHOUT WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Schmitt Industries Incorporated does not warrant that the functions contained in the product will meet your requirements or that the operation of the product will be uninterrupted or error free Schmitt Industries Incorporated does warrant as the only warranty provided to you that the product which is furnished to you will be free from defects in materials and workmanship under normal use for a period of twelve 12 months from the date of delivery to you as evidenced by a copy of your warrant receipt LIMITATIONS OF REMEDIES Schmitt Industries Incorporated s entire liability and your exclusive remedy shall be 1 the replace
19. Serial Output Control Analog Output Mode Take Single Sample AR200 User s Manual 33 Rev 2 1 Acuity AR200 User s Manual 34 Rev 2 1 Set Baud Rate Length 2 bytes Default 9600 ASCII Code B lt BaudRateCode gt BaudRateCode 1 300 2 1200 3 2400 4 4800 5 9600 6 19200 7 38400 8 57600 9 115200 Function Button Code 7 lt BaudRateCode gt This Command sets the baud rate to the specified value as given by the above table Example To set the baud rate to 115 2K baud enter B9 Note The baud rate may limit the maximum sample rate It takes over 1 millisecond to transmit a single ASCII character at 9600 baud Setting the sample interval to a time less than the time needed to transmit a single sample will result in continuous output of single distance measurement samples For the highest possible sample rates it is necessary to send the data in binary format at a baud rate of least 57 6K baud See Also Set Sample Interval Serial Output Control Analog Output Mode Set Serial Output to Binary Write Configuration Data Length 5 bytes ASCII Code W1234 Function Button Code 9 This command sets the power up state of all configuration options to their present values The configuration is immediately preserved and automatically becomes the new power up state Example To write sensor s present configuration state enter W1234 Note The argumen
20. action of the full scale range times 50 000 If no numeric parameter is entered or the switch is used to enter this command the zero point will be set to the presently measured distance Example To set the Limit 2 point to the middle of the sensor s measurement range enter K25000 lt CR gt 0 5 x 50 000 25 000 Note The K command Limit 2 must be set after U command Span point The J and K commands Limits 1 and 2 respectively both accept zero as a valid parameter although this value will never trip the limit If the Z parameter is not zero then the J and K values entered are relative to the zero point and subject to the span direction The J and K commands without parameters use values determined as if Z is zero The limit will be offset by the amount of the zero point and the limit point will be subject to the span direction See Also Set Span Set Limit Switch Directions AR200 User s Manual 29 Rev 2 1 Acuity Set Span Length 1 6 bytes Default 50000 ASCII Code U lt Span gt 0 lt Span lt 50000 Function Button Code 2 This command sets the point at which the current loop and voltage loop output is at its maximum value and where Limit Switch 2 becomes active The value entered is the fraction of the full scale range times 50 000 If the span is set to a distance which is less than a previously set zero point the sensor output values will increase as the target point moves
21. al Command The Sample Priority command controls whether the sensor outputs a sample at the sample interval programmed even if there is no sample available Zero will be output if the AR200 User s Manual 3 A Rev 2 1 reflection from the target is low or the target is out of the measurement range In the default configuration priority given to sample rate if the sensor is unable to collect enough light to obtain a measurement the sensor will output zero at the specified sample rate Alternatively if this command is used to give priority to sample quality and the sensor is unable to take measurements it will reduce the sample rate If no sample is attained in 0 1 seconds the sensor will put out zero even if sample quality is given priority Note that the current loop will hold its value until another sample is available if priority is set to sample quality See the Principles of Operation Section for more information Note The laser may be turned on and off with the Sampling On Off command After making changes to the configuration it may be saved by using the Write command The present configuration may displayed with the Show Configuration command cuity Laser Measurement 2 General Description The AR200 is a laser diode based distance measurement sensor for ranges from 6 to 50 mm models are actually quarter half one and two inch respectively with 12 and 100 um accuracy respectively There are four different standa
22. ation Data Set Sample Priority Length 2 bytes Default Rate ASCII Code P lt Mode gt Mode 1 Quality 2 Rate Function Button Code 13 lt Mode gt This command sets the priority for sample output When the priority is set to Quality the sensor will adjust the time to take a single distance reading to maintain a high signal quality If the time required for taking a single distance reading is longer than the sample interval the signal quality is given a higher priority and the samples are sent at the maximum rate possible to maintain signal quality If the maximum possible time is exceeded a value of zero will be sent When the priority is set to Rate the sensor will send sample at the rate set optimizing and averaging internal samples to the extent the sample time allows If the signal quality is below a minimum level a value of zero will be sent Example To set the sample priority to enter P2 Note In no case may the sample interval be set below 800 microseconds This minimum sample interval is the same for both Quality and Rate priorities See Also Set Sample Interval Serial Output Control Analog Output Mode AR200 User s Manual 37 A 2 1 culty Laser Measurement Set Serial Output to ASCII Length 1 byte Default ASCII ASCII Code D Function Button Code Serial Entry Only This Command sets the serial output f
23. cessed Default settings are for the factory configuration Command Name Set Zero Point Limit 1 Set Limit Directions Set Limit 1 Set Limit 2 Set Span Limit 2 Set Sample Interval in 100us increments Analog Output Mode Background Light Elimination On Off Sampling On Off also Laser On Off AR200 User s Manual Rev 2 1 Length 1 6 bytes 2 bytes 1 6 bytes 1 6 bytes 1 6 bytes 2 6 bytes 2 bytes 2 bytes 2 bytes Command Code ASCII Code Z lt ZeroPoint gt 0 lt ZeroPoint lt 50000 Function button code 1 ASCII Code F lt LimitCode gt 1 lt LimitCode lt 4 Function button code None ASCII Code J lt LimitPoint gt 1 lt LimitPoint lt 50000 Input Switch code None ASCII Code K lt LimitPoint gt 1 lt LimitPoint lt 50000 Input Switch code None ASCII code U lt Span gt 0 lt Span lt 50000 Function button code 2 ASCII Code S lt Interval gt 8 lt Interval lt 50000 Function button code 3 lt Rate Code gt ASCII Code X lt Mode gt Mode 1 Current 2 Voltage 3 NPN 4 PNP 5 off Function button code 4 lt Mode gt ASCII Code L lt Mode gt Mode 1 on 2 off Function button code 5 lt Mode gt ASCII Code H lt Mode gt Mode 1 on 2 off Function button code 6 lt Mode gt 24 Default Setting Zero range 20 Active Inward F2 Active Outward F1F4 Min range 71 Max range K5
24. ch In NPN limit switch mode the analog lines provide two switches that can be used to sink up to 150mA of current each In the default configuration the limit switches are updated 5 times per second This may be increased or reduced with the Set Sample Rate Command using either the pushbutton on the back of the sensor or the S command over the serial port The default configuration is for calibrated output with the zero point at zero distance and the span at full scale Limit switch 1 is active below the zero point and inactive beyond the zero point Limit switch 2 is active above full scale and inactive below it The direction of activation can be changed with the set limit directions command The activation point can be changed with the set limit point command The minimum switch point separation is 5 of the full measurement distance of the sensor Attempts to set a smaller span will be ignored and the span will not be changed 8 4 PNP Limit Switch AR200 User s Manual 19 Rev 2 1 In PNP limit switch mode the analog lines provide two switches that can be used to source up to 150mA of current each In the default configuration the limit switches are updated 5 times per second This may be increased or reduced with the Set Sample Rate Command using either the pushbutton on the back of the sensor or the S command over the serial port The default configuration is for calibrated output with the zero point at zero d
25. cing the benefits of this mode The total time required for obtaining a sample in this mode will be approximately twice what it is with background light elimination off If the sensor cannot detect a distinct peak in the camera data or the measurement is just beyond the end of the full scale span but with the spot still on the camera near one end the sensor will output zero distance If there is no target in the measurement range and background light elimination is on the sensor will generally put out zeros However if lighting conditions are changing rapidly or if background light elimination is off a bright spot can be taken as the laser spot and a false range reading generated when there is no target in range For best rejection of spurious signals the AR200 should be ordered with the optical filter option The AR200 emits visible laser light red 650 nm wavelength models are Class laser products and are limited to 1 mW of power The aperture warning label and product identification placard shown below appear on the AR200 models RED 42 30 VDC Model No B Ly Open Buttons Enabled E 200 6 0 VDC Buttons Disabled W AR 200 12 WHT Open LASER Enabled W AR 200 25 0 VDC LASER Disabled AR 200 50 Acuity AR200 Schmitt Measurment Systems Inc Manufactured in Portland OR COMPLIES WITH 21 CFR E 1040 10 AND 1040 11 S N Figure 1 Laser Aperture Warning Label and side placard AR20
26. d wire when activated When a switch is not active its output will be high impedance and no current will flow through it Each switch direction and activation point can be set through a serial port command or through the function button Analog Mode PNP Limit Switches Wire Color Orange Wire Color Brown Function PNP Limit Switch 1 Function PNP Limit Switch 2 AR200 User s Manual 13 Rev 2 1 Acuity AR200 User s Manual 14 Rev 2 1 In this mode the PNP limit switches can source up to 150mA each through the red positive supply wire when activated When a switch is not active its output will be high impedance and no current will flow through it Each switch direction and activation point can be set through a serial port command or through the function button Serial Mode RS 232 Wire Color Yellow Wire Color Green Wire Color Black Function RxData Function TxData Function Ground In this mode the yellow wire is used by the AR200 for receiving RS 232 serial data the green wire is used for transmitting data and the black wire is used as a common ground reference Wire Color Blue Function Buttons Disable The function analog and serial buttons may be disabled by connecting this wire to ground or the black wire If the blue wire is left unconnected the buttons will be enabled This function is useful for preventing accidental changes to an AR 200 through the button interface after the device has been configured Wir
27. e Color White Function Laser Disable Connecting this wire to ground the black wire will disable the laser If the white wire is left unconnected the laser will be enabled If this input will be controlled by an operator from more than two meters from the sensor then an emission indicator near the operator control area may be necessary to comply with laser safety regulations 6 Serial Interface Specification 6 1 Hardware Port The serial output mode can be selected by pressing the serial mode button The default serial port mode is RS 232 In RS 422 RS 485 terminated mode the serial port is set for half duplex transmission and a 120 ohm termination is switched in between the serial wires In RS 485 unterminated mode the serial port is set for half duplex transmission and the 120 ohm termination is switched out Data can be transferred at baud rates from 300 to 115 2K baud in binary or ASCII format A standard 9 pin serial connector can be built to interface with an IBM or compatible computer using connection the pinout table below The RS 422 RS 485 serial mode function for the port is also shown RS 232 Function Wire Color 1 NC 2 TxData Green 3 RxData Yellow 4 NC 5 GND Black 6 NC 7 NC 8 NC 9 NC Figure 4 RS232 wire color reference chart AR200 User s Manual 15 Rev 2 1 Acuity AR200 User s Manual 16 Rev 2 1 6 1 1 Output Flow Control The sensor responds to software flow cont
28. ettings since the inherent sensor stability is better than 1 part in 3000 Current loop output is linear with respect to measured range to 1 part in 2000 Selectable zero and span allow full resolution over any distance span AR200 User s Manual 20 Rev 2 1 Acuity 10 Nonvolatile Memory Storage 10 1 AR200 User s Manual 21 Rev 2 1 Nonvolatile Memory Operation The AR 200 stores its configuration settings and calibration information in electronically erasable non volatile memory Factory configuration values are stored for the configuration settings when the sensor is shipped and the factory configuration settings may be restored at any time using the Reset Configuration command or by holding the push button down while powering up the sensor The calibration information is specific to the sensor and cannot be changed If the sensor cannot verify the calibration information is valid when the sensor is turned on the light on the end cap will flash and the sensor will continuously transmit at 9600 baud the message CALIBRATION DATA CORRUPTED RELOAD DATA The sensor cannot measure distances if the calibration data is corrupted Contact Acuity for instructions If the sensor cannot verify the configuration information when the sensor is turned on the light on the end cap will flash and the sensor will continuously transmit at 9600 baud the message SAVED CONFIGURATION INVALID USING DEFAULT SETTINGS P
29. first The location of the zero point may be changed with the Set Zero Point command The direction of increasing output serial values from the zero point may be reversed by issuing the Set Span command with a distance closer than that used in a previously issued Set Zero Point command 7 1 1 ASCII Data format DDD DDDDDD lt CR gt lt LF gt In this configuration each sample consists of a string of characters as follows 5 to 8 distance characters followed by lt CR gt lt LF gt for a maximum of 10 characters including lt CR gt lt LF gt characters Leading zeros are not printed unless the distance is less than 1 in which case only the leading zero before the decimal point is printed The maximum number of characters is dependent on the sensor model and the measurement units selected 7 1 2 Binary Data format DD lt FF gt In this configuration each sample consists of 3 bytes 2 distance bytes which constitute a data word and a termination byte The data word can have the value from 0 to 50 000 which corresponds to the distance from zero to the full scale distance To convert the two bytes to a range value use the following equation Most Significant Byte 256 Least Significant Byte Full Scale Span 50 000 The distance is transmitted Least Significant byte first Halting the serial output and then restarting it after flushing the serial input to the host may be done to synchronize the binary serial data stream The He
30. format 12 Maintenance of laser sensor The AR200 laser sensors require little maintenance from the user The sensor window s should be kept clean of dust buildup as a part of regular preventative maintenance Use compressed air to blow dirt off the window or use delicate tissue wipes and a light solvent such as isopropyl alcohol or water Avoid using pressurized water and do not use abrasive wipes on the optical glass If your sensor does not function according to specifications contact Schmitt Measurement Systems Inc 13 Sheet Summary of Specifications Go to http www acuityresearch com products ar200 sensor technical data download shtml AR200 User s Manual 40 A Rev 2 1 i t Laser Measurement y
31. haracters Commands are executed in the order they are received When sending multiple commands each command is executed before the next command is evaluated Example The following all send a valid a Set Sample Interval command 550 lt gt s00050 or SSOA2 lt CR gt The last example also sets the output to metric units It is advisable to always terminate single commands or the last command in a sequence with a character such as or lt CR gt to ensure immediate command execution regardless of the length of numeric parameters entered AR200 User s Manual 22 A Rev 2 1 culty Laser Measurement 11 2 Function Button Commands To manually enter commands with the function button and LED on the end cap the sensor should be on and operating normally with the LED lit continuously Action Indication Press and hold function button LED goes out for one second Continue holding function button LED flashes once per second until the number of flashes equals the desired command code Release function button LED stays off if parameters are required If Parameters are required press and LED flashes once per second hold function button until the number of flashes equals the desired parameter code Release function button Sensor repeats the number of flashes for the command code If a parameter is required the number of flashes for the parameter code is repeated The command takes effect
32. ial Entry Only indicates that the command cannot be given using the switch on the end cap of the sensor Set Zero Point Length 1 6 bytes Default 0 ASCII Code Z lt ZeroPoint gt 0 lt ZeroPoint lt 50000 Function Button Code 1 This command sets the zero point for both the serial and analog mode outputs to the value specified and where Limit Switch 1 becomes active The value entered is the fraction of the full scale range times 50 000 If no numeric parameter is entered or the switch is used to enter this command the zero point will be set to the presently measured distance Example To set the zero point to the middle of the sensor s measurement range enter Z25000 lt CR gt 0 5 x 50 000 25 000 Note To set the zero point to the present measured distance the sensor should be operating and pointed at a stationary target The sensor can be made to reverse the direction of increasing distance values for the limit switches the serial and current loop outputs by setting the zero point to a value greater than the span point The zero point should be set before the span point The Z command Zero Point sets the Limit value to 1 Setting the Z command Zero Point after the U command Span Limit preserves the Span and shifts the Zero Point See Also Set Span Set Limit Switch Directions AR200 User s Manual 26 Rev 2 1 Acuity Laser Measurement Set Limit Directions Leng
33. ica Should you have any questions concerning this Agreement you may contact Schmitt Industries Incorporated by writing to Schmitt Industries Incorporated 2765 NW Nicolai St Portland Oregon 97210 USA YOU ACKNOWLEDGE THAT YOU HAVE READ THIS AGREEMENT UNDERSTAND IT AND AGREE TO BE BOUND BY ITS TERMS AND CONDITIONS YOU FURTHER AGREE THAT IT IS THE COMPLETE AND EXCLUSIVE STATEMENT OF THE AGREEMENT BETWEEN YOU AND SCHMITT INDUSTRIES INCORPORATED AND ITS DEALER US WHICH SUPERSEDED ANY PROPOSAL OR PRIOR AGREEMENT ORAL OR WRITTEN AND ANY OTHER COMMUNICATIONS BETWEEN US RELATING TO THE SUBJECT MATTER OF THIS AGREEMENT AR200 User s Manual A 2 1 Laser Measurement Procedures for Obtaining Warranty Service 1 Contact your Acuity distributor or call Schmitt Industries Inc to obtain a return merchandise authorization RMA number within the applicable warranty period Schmitt Industries will not accept any returned product without an RMA number 2 Ship the product to Schmitt Industries postage prepaid together with your bill of sale or other proof of purchase your name address description of the problem s Print the RMA number you have obtained on the outside of the package This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interfe
34. ined through power cycling with the Write command ASCH Commands Each ASCII command is composed of one letter followed by up to 5 digits comprising a numeric parameter The command letters may be upper or lower case Some commands have no parameters and the command executes as soon as the command letter is received Other commands will not execute unless specific parameters are received There is no command termination character Commands can be terminated three ways When a non alphanumeric character is received such as or lt CR gt e When the maximum number of parameter characters is received e When the next command letter is received The command is evaluated after the command is terminated If the required or optional parameters are valid the command is executed There is no acknowledgement character from the sensor when the command is received evaluated or executed If the command is a valid command string the command will be executed If the command is not a valid command string the entire command is ignored Multiple commands may be grouped together in a single transmission However sending more than 10 characters in a single transmission at high baud rates may result in loss of characters The sensor always uses the CTS signal to indicate when there is a danger of losing characters Enable hardware flow control on the sending system to avoid the loss of characters The sensor does not send software flow control c
35. ing is changing rapidly and the laser will flash 10 times per second 1 1 3 Important Configuration Considerations There are 3 sensor configuration commands that significantly affect operation Satisfactory operation for specific applications will only be attained with appropriate configuration settings See the AR200 Command Set section for details on configuring the sensor Background Light Elimination On Off When Background Light Elimination is on the factory default the sensor captures 2 images one with the laser off and one with the laser on and subtracts them to reduce the effects of ambient lighting The maximum attainable sample rate with Background Light Elimination on is 600 samples per second vs 1250 with it off On brightly lit targets performance may be improved with this setting On If the environmental lighting is changing rapidly the improvement may be reduced Set Sample Interval The sample interval is set in tenths of milliseconds Using 8 as the parameter will set the sample rate to 0 8 milliseconds or 1250 samples per second Using 10000 will set the sample rate to once per second For fastest output use serial binary format at 57 600 baud or higher or the analog output If an analog output is selected disable the serial output to attain 1250 samples second Set Sample Priority If the light reflected from the target is low the time needed to take a sample may be longer than the time set with the Set Sample Interv
36. ipment See the Signal and Power Interface section for wire connections In its default configuration the AR200 will begin measuring and transmitting range data on power up In 4 20mA analog output mode the best accuracy and linearity for the current loop is obtained with a 500 ohm load to current loop return at the measurement point In 0 10V analog output mode the best accuracy and linearity for the voltage output is obtained with a 10K ohm load to the voltage output return at the measurement point 4 1 2 Connection to a Host Computer A 9 pin serial D sub serial connector can be attached to the serial output wires to connect the AR200 directly to an IBM PC compatible 9 pin serial port Connect a 15 volt power supply to the power and ground lines of the Power Signal cable See the Signal and Power Interface for wire connections Only the power and ground need be connected for operation with the serial interface For testing use a terminal emulation program such as the Windows HyperTerminal set to 9600 baud 8 bits no parity 1 stop bit 4 2 Power On When power is applied the function LED will flash briefly and then stay on and a red laser beam will be emitted from the front laser aperture window The sensor will begin transmitting range readings as soon as the laser comes on AR200 User s Manual 9 Rev 2 1 Acuity 4 3 Verifying Operation In its default configuration the AR200 transmits 5 samples per second at 9600 baud over
37. istance and the span at full scale Limit switch 1 is active below the zero point and inactive beyond the zero point Limit switch 2 is active above full scale and inactive below it The direction of activation can be changed with the set limit directions command The activation point can be changed with the set limit point command The minimum switch point separation is 5 of the full measurement distance of the sensor Attempts to set a smaller span will be ignored and the span will not be changed Acuity Laser Measurement 9 Serial and Analog Output Performance Specifications 9 1 Sample rate The maximum possible sample rate is 1 250 samples per second The maximum sample rate is obtained with background light elimination off Only one output either analog or serial should be enabled at given time to obtain the maximum sampling rate If the serial output is used it should be set to at least 57 600 baud sending binary samples The sample period is programmable to times at or longer than 0 8 milliseconds 1 250 samples per second using the Set Sample Interval Command This command allows the sample rate to be set anywhere from 1 250 samples per second S8 to one sample every 5 seconds S50000 The sample interval is set in increments of 100 0 1 milliseconds Sample period has a slightly different meaning for serial output and for the analog output For serial output one sequence of characters is transmitted at each sample in
38. itt Industries incorporated LICENSE a You are granted a personal nontransferable and non exclusive license to use the hardware and software in this Agreement Title and ownership of the hardware and software and documentation remain in Schmitt Industries Incorporated the hardware and software may be used by you only on a single installation c you and your employees and agents are required to protect the confidentiality of the hardware and software You may not distribute disclose or otherwise make the hardware and software or documentation available to any third party you may not copy or reproduce the hardware and software or documentation for any purpose e your may not assign or transfer the hardware and software or this license to any other person without the express prior written consent of Schmitt Industries Incorporated you acknowledge that you are receiving only a LIMITED LICENSE TO USE the hardware and software and related documentation and that Schmitt Industries Incorporated retains title to the hardware and software and documentation You acknowledge that Schmitt Industries Incorporated has a valuable proprietary interest in the hardware and software and documentation YOU MAY NOT USE COPY MODIFY OR TRANSFER THE HARDWARE AND SOFTWARE IN WHOLE OR IN ANY PART WITHOUT THE PRIOR WRITTEN CONSENT OF SCHMITT INDUSTRIES INCORPORATED IF YOU TRANSFER POSSESSION OF ANY PORTION OF THE HARDWARE OR SOFTWARE TO ANOTHER PARTY YOUR LIC
39. ment of any hardware and software not meeting Schmitt Industries Limited Warranty and which is returned to Schmitt Industries Incorporated or an authorized Schmitt Industries dealer with a copy of your purchase receipt or 2 if Schmitt Industries Incorporated or the dealer is unable within ninety 90 days to deliver a replacement product which is free of defects in material or workmanship you may terminate this Agreement by returning the product and your money will be refunded to you by the dealer from whom you purchased the product IN NO EVENT WILL SCHMITT INDUSTRIES INCORPORATED BE LIABLE TO YOU FOR ANY DAMAGES INCLUDING ANY LOST PROFITS LOST SAVINGS OR OTHER INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE SUCH PRODUCTS EVEN IF SCHMITT INDUSTRIES INCORPORATED OR AN AUTHORIZED DEALER HAD BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR FOR ANY CLAIM BY ANY OTHER PARTY SOME AREAS DO NOT ALLOW THE LIMITATIONS OR EXCLUSION OF LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU GENERAL You may not sublicense assign or transfer the license or the hardware software and documentation except as expressly provided in this Agreement Any attempt otherwise to sublicense assign or transfer any of the rights duties or obligations hereunder is void This Agreement will be governed by the laws of the United States and the State of Oregon United States of Amer
40. necessary to send the data in binary format See Also Background Light Elimination Set Baud Rate Serial Output Control Analog Output Mode Set Serial Output to Binary Set Sample Priority AR200 User s Manual 31 Rev 2 1 Acuity Length 2 bytes Default Current Analog Output Mode Loop On ASCII Code X lt Mode gt Mode 1 Current 2 Voltage 3 NPN 4 PNP 5 off Function Button Code 4 lt Mode gt This command sets the analog output mode A value of 1 turns the current loop output on or off When the current loop mode is enabled a current between 4 milliamps and 20 milliamps will be transmitted out the current loop line When the voltage loop mode is enabled a voltage between 0 and 10V will be transmitted out of the voltage loop line When the NPN LS mode is enabled two limit switches capable of sinking up to 150mA will be enabled When the PNP LS mode is enabled two limit switches capable of sourcing up to 150mA will be enabled Example turn the analog output off enter X5 Note The analog mode button can be used to quickly set the analog output mode Each time the button is pressed the mode will advance to the next mode Background Light Elimination On Off Length 2 bytes Default On ASCII Code L lt Mode gt Mode 1 2 off Function Button Code 5 lt Mode gt This command turns the background light elimination on or off When background light elimination is
41. on a reading of the background light is taken with the laser off The background reading is then used to eliminate the effects of illumination from other light sources Example To turn Background Light Elimination off enter L2 Note The highest possible sample rate is obtained when Background Light Elimination is off However since the sensor can not verify that the strongest signal is from the laser Background Light Elimination should be turned off only in situations when the background light is low and diffuse AR200 User s Manual 32 Rev 2 1 Acuity Sampling Laser On Off Length 2 bytes Default On ASCII Code H lt Mode gt Mode 1 2 off Function Button Code 6 lt Mode gt This command turns the automatic sampling on or off When automatic sampling is on the sensor takes continuous measurements of the distance The sensor calculates and sends the distance sample at the requested sample rate When automatic sampling is off the sensor does not take any distance measurements unless commanded by the Take Single Sample command The laser is off when sampling is off unless the Take Single Sample command is issued Example To turn automatic sampling off enter H2 Note The sensor calculates distance samples over the time period specified by the Set Sample Interval command The sensor will output a sample on all outputs that are installed and enabled See Also Set Sample Interval
42. ons of AR200 AR200 User s Manual Rev 2 1 1 91 64 mm 69 8 mm 1 NPNLS 2 75 15 O D 6 3 25 Cable 8 Conductor 2 8 119 E 422 485 Term E 485 Term E RS 232 Serial E 4 20 E 0 10 Analog Acuity Laser Measurement Both of these areas 2 3 Installation and safety The AR200 sensor is typically installed by affixing the sensor to a machined bracket with bolts through the two mounting holes in the sensor These holes are 3 mm in diameter and their location is shown in the mechanical drawing above Laser light is emitted from the top of the rectangular window closest to the Laser Radiation placard An illustration of how light is emitted is shown below Laser Target Return Light Figure 3 Direction of laser emission This laser device should not be aimed at human eye Installers of laser sensors should follow precautions set forth by CFR 1040 10 or by their local safety oversight organization AR200 User s Manual 7 Rev 2 1 Acuity Laser Measurement 3 Operating Guidelines AR200 User s Manual 8 Rev 2 1 Use protective eyewear whenever there is a risk of being exposed to the output beam of the AR 200 Use eyewear specifically designed to block laser radiation of the frequency used by the sensor Do not point the sensor at any person particularly a person s eyes or face Laser radiation can damage
43. ormat to ASCH allowing it to be read on a terminal See the Output Data Formats section for a detailed description of the serial data stream in binary format Example To set the Serial Output to ASCII enter D Note Each sample is terminated with lt CR gt lt LF gt character pair The Serial Output has to be enabled for data to be transmitted See Also Set Serial Output to Binary Serial Output Control Set Serial Output to Binary Length 1 byte Default ASCII ASCII Code N Function Button Code Serial Entry Only This Command sets the serial output format to Binary See the Output Data Formats section for a detailed description of the serial data stream in binary format Example To set the Serial Output to Binary enter N Note Each sample is consists of two data bytes terminated with a byte equal to The Serial Output has to be enabled for data to be transmitted See Also Set Serial Output to ASCII Serial Output Control AR200 User s Manual 38 Rev 2 1 Acuity Take Single Sample Length 1 byte ASCII Code E Function Button Code Serial Entry Only This command takes a single distance sample and transmits it The present sample interval setting is used as the period of time to acquire the distance sample This command can be used to synchronize distance measurements to other processes Example To take a single distance sample enter
44. rd models Each model has a different standoff center of span distance full scale span and center of span accuracy These are listed in the table below For more detailed specifications see the data sheet The standoff distance represents the distance from the face of the sensor to the center of the measurement range For the AR200 sensor the standoff specification is approximated Model Standoff mm Span mm Linearity approximate Accuracy um AR200 6 21 6 35 12 7 AR200 12 24 12 7 25 4 200 25 34 25 4 50 8 200 50 42 50 8 101 6 2 1 Principles of Operation AR200 User s Manual 4 Rev 2 1 The AR200 uses triangulation to measure distance The laser beam is projected from the housing and is reflected from a target surface to a collection lens The lens focuses an image of the spot on a linear array camera The camera views the measurement range from an angle that varies from 45 to 65 degrees at the center of the measurement range depending on the model The position of the spot image on the pixels of the camera is then processed to determine the distance to the target The camera integrates the light falling on it so longer exposure times allow greater sensitivity to weak reflections The exposure time and laser power level are controlled to optimize the accuracy of the measurements for the signal strength and environmental light level measured If the sample rate set allow
45. rence that may cause undesired operation Note This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this device in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense This manual copyright 2008 Acuity a product line of Schmitt Measurement Systems Inc AR200 User s Manual Rev 2 1 A 1 Acuity Laser Measurement User s Manual for the AR200 Series Laser Displacement Sensors Table of Contents Te INTRODUCTION ssssvsscssccssssssocsoscossscsesessacsecssaassasvactenssescansoasscensessevdoasonsovenssdactasbaseodedecsonsesbedennsancd esos oss oss Sii s 1 1 1 QUICK START INSTRUCTIONS Bee eile Eee ee es 1 1 1 1 Analog and Limit Switch Signals 1 1 1 2 WU eS EOE 2 1 1 3 Important Configuration
46. rol using Ctrl S and The sensor will always stop the transmission of samples if Ctrl S is received and will always resume the transmission of samples when Ctrl Q is received The sensor will complete any transmission of a sample that is in process when Ctrl S is received Sending Ctrl S does not stop the sensor from taking distance measurements but all samples that would be transmitted are lost Sending Ctrl Q resumes the transmission of samples at the next scheduled transmission time as specified by the sampling interval Software flow control Ctrl S Ctrl Q only affects the transmission of samples other serial transmissions are still sent e g if V1234 is transmitted to the sensor it will still transmit the version and configuration data even if the transmission of samples has been stopped with Ctrl S Software flow control Ctrl S Ctrl Q is not affected by the Flow Control configuration parameter 6 1 2 Input Flow Control The sensor does not transmit Ctrl S Ctrl Q If the host is transmitting command sequences that are more than 10 bytes in length pause for 0 1 seconds between commands 7 Serial Data Formats 7 1 Output Data Formats AR200 User s Manual 17 Rev 2 1 Data is transmitted from the AR200 as 8 data bits with no parity and 1 stop bit The data sent consists of calibrated distance readings There are two data formats ASCII or binary In binary all samples are transmitted least significant byte
47. s time for internal averaging of multiple exposures before transmission that is done Exposure time and laser power are adjusted from sample to sample so rapidly changing conditions may result in momentary loss of signal or overexposure If the sensor cannot take another exposure before it is time to transmit a sample a zero value will be output As described in the Quick Start section there are several operating mode options that significantly affect the behavior of the sensor The first of these is sample rate Lower sample rates allow more averaging of the range signal and lower noise levels Higher sample rates may be used when the reflected signal is relatively strong The sensor may be set to either wait up to 0 05 seconds or 0 1 second if background light elimination is on until it has good data before updating the output or to update the output at the specified rate even if that interval does not permit acquisition of a good sample and a zero must be sent If high levels of ambient light are present the use of the background light elimination mode may improve measurement quality In this mode a camera exposure is taken with the laser off and subtracted from a subsequent exposure with the laser on This will eliminate many ambient light effects unless the ambient light levels in the target area are changing rapidly In this case the light measured during the laser on exposure may be different from that during the laser off exposure redu
48. served Generally the span should be set after the zero point The U span point command sets the Limit 2 value based on the Z Zero Point command See Also Set Zero Point AR200 User s Manual 30 Rev 2 1 Acuity Laser Measurement Set Sample Interval Length 2 6 bytes Default 2000 ASCII Code S lt Interval gt 8 lt Interval lt 50000 Function Button Code 3 lt RateCode gt RateCode 1 S10 1KHz sample rate 2 S100 100Hz sample rate 3 S 1000 10Hz sample rate 4 S 10000 1Hz sample rate This command affects both serial and analog outputs When invoked as the S command over the serial port this command sets the output rate of the sensor to the specified sample interval in increments of 100 microseconds To set with the function button The sample rate may be set to 1 10 100 or 1000 samples per second The command code is 3 followed by the sample rate code Example To set the maximum sample rate enter 58 lt gt 8 x 100us 800us sample interval 1 25KHz sample rate Note Samples will not be sent unless corresponding output is enabled If the interval is set to a time less than the minimum time required to acquire a single distance reading samples will be sent continuously at the maximum possible sample rate The maximum rate minimum sample time will be limited by baud rate target reflectance background light and exposure mode For the highest possible sample rates it is
49. ssens 18 8 1 CURRENT LOOP OUTPUT e aa e sad web laueveat ead wabbeateruseaes es 18 8 2 VOLTAGE veuevsuce webb vate weed saa E EEEE 18 8 3 NPN EIM SWITGEL 35555css00s003hsenenesveessnevogeveeceoevsncbesovsnevedevsnavegovencevaevencdeonvsnsbvoessneVogevencyeoevancdeoevsecvedevsntves 19 8 4 PNP TIMED sued waabeutevdtenates 19 AR200 User s Manual 1 Acuity Laser Measurement 9 SERIAL AND ANALOG OUTPUT PERFORMANCE 20 9 1 SAMPLE 20 9 2 RESOLUTION 20 10 MEMORY STORAGE ssssccsssssccssssscccsssccsssscccsssceccessscaccessecssessscecssnsscccsssacccsssseese 21 10 1 NONVOLATILE MEMORY OPERATION s0sssssssssssssesssesssessssesssssesssssssssseeeeeseeussesssessessseessesssssesesnseeeees 21 11 AR200 COMMAND SET sesscasccccscsts scsscsctecccusiesstececulseceacasstscsctececsusscsessnstscessesd scessuetecessessssdbscsdssosssssssasvssecses 22 11 1 AS CIT COMMANDS 3 cescccccuceutdeiuctedctundecedesndeuccadudancdestdandeandacnddsccaccceansenddestdbecedaudensdesndeuccaatseeceesudeaasastseondssies 22 11 2 FUNCTION BUTTON COMMANDS cccesessssssessssssssssssssssssscssssssscssecsssessssesseessssceessesseeeeseeseseeeeessseeseseseeeeees 23 11 3
50. t 1234 is required to prevent accidental writes Factory defaults may be restored at any time with the Initialize Configuration Command Caution The sensor uses electronically erasable nonvolatile memory to store configuration Data The memory is specified to retain the information for over 200 years However the memory can only be written to 1 000 000 times Do not program automated equipment to send the Write Configuration Command Once this command is executed the previous saved configuration is lost and cannot be restored The only way to restore a previous configuration is to change each setting to the desired value See Also Initialize Configuration Read Configuration Data Length 1 byte ASCII Code R Function Button Code 10 This command reads the configuration information from the nonvolatile memory and makes it the current configuration It may be used to restore the power up configuration if a temporary change has been made with any of the configuration commands This command is executed automatically when the sensor is turned on Example To restore the last saved configuration state enter R Note Factory defaults may be restored at any time with the Initialize Configuration Command See Also Initialize Configuration AR200 User s Manual 35 A Rev 2 1 culty Laser Measurement Serial Output Control Length 2 bytes Default English ASCII Code A lt Mode gt Mode
51. terval The sample rate may be limited by the time required to transmit each sample at the specified baud rate If the baud rate is the limiting factor data will be transmitted continuously For analog output the output is updated once per sample interval up to the limits of the sensor s sample rate capability If only the analog output is enabled the maximum obtainable sample rate is 1 250 samples per second If both the serial and current loop outputs are enabled the maximum output rate is 1 111 S9 samples per second 9 2 Resolution Range resolution is dependent on the sensor model The ASCII serial output resolution is equal to about 1 part in 50 000 over the full scale span For example the distance increments for sensors with a 0 50 inch full scale span are 0 00001 inches and distance readings for a sensor with a 1 inch full scale span is 0 00002 inches When the distance increments would be greater than 5 in the last digit the number of decimal points will decrease by 1 The full 50 000 points across the span are always available by using the binary data output command The resolution of the sensors is one part in 3000 but smaller target position changes may be evident in the sensor s output However the indicated changes in distances below 1 part in 3000 may not equal the actual distance changes to any degree of accuracy The current loop output has a resolution of 1 part in 4000 This may become noticeable for large span s
52. th 2 Default F1 F4 ASCII Code F lt LimitCode gt 1 lt LimitCode lt 4 Function Button Code Serial Entry Only The limit outputs are on the yellow and green wires in the power signal cable These lines may be configured to have open collector NPN current sinking outputs or PNP open collector sourcing outputs When a limit is active the line is connected to ground and can sink up to 150 mA When a limit is not active it is an open line The limits can be set to become active at any point in the measurement range and in either direction from that point See the Set Zero Z and Set Span U commands to set the location at which limits are activated F1 Set limit 1 active below zero point F2 Set limit 1 active above zero point F3 Set limit 2 active below span point F4 Set limit 2 active above span point Note If the zero point is set farther from the sensor than the span the limits will trip according to their settings relative to the new zero and span below zero point now means farther from the sensor than the zero point Example To set limit 1 to be active in the first half of the measurement range enter FI lt CR gt To set limit 2 to be active from the presently measured point to the high end of the range enter F4 lt CR gt See Also Set Zero Point Set Span AR200 User s Manual 27 A Rev 2 1 culty Laser Measurement Set Limit 1 Length 1 6 Default J1 ASCII Code
53. uch as being set at the wrong baud rate Turn the power off press the function button on the AR200 and turn the power on with the button held down The LED should stay off until the button is released and then flash briefly This will reset the sensor to the factory default configuration 9600 baud 8 bits no parity 1 stop bit and should enable serial communication with the host system 4 4 2 Range Output Check If the range output is in error check that the sensor and target are stationary and stable that the target is in the middle of the measurement span as an initial test range and that the beam is hitting the target The sensor may need to warm up for 5 10 minutes before reaching full accuracy leave it on for a few minutes and re check the range accuracy AR200 User s Manual 11 Rev 2 1 Acuity Laser Measurement 5 Signal and Power Interface The AR200 has a multipurpose cable with soldertail wires If the AR200 is ordered with a power supply the power signal cable will be connected to the power supply Connection and termination according to the instructions is essential for correct sensor operation Read the wire descriptions for connection information 5 1 Wire Power and Signal Cable The tables below shows the wiring on systems ordered without power supplies Wire Function in All Modes Red Power 15V 12 30 VDC min max Black Blue Ground Buttons Disable White Laser Disable
54. upply Wire Shield Function Ground Connected to ground internally Should be grounded at supply end Analog Mode 4 20mA Current Loop Wire Color Orange Wire Color Brown Function Current Loop Output Function Current Loop Return In this mode the orange wire delivers a current proportional to the measured range The offset of the zero range point and the span location point of full scale output may be set using the appropriate commands Best accuracy is obtained by loading the line with a 500 ohm resistor to the current loop return at the measurement point The brown wire is the current loop return This line is switched internally to the 15V power supply return z Analog Mode 0 10V Voltage Output Wire Color Orange Wire Color Brown Function 0 10V output Function Voltage output return In this mode the orange wire delivers a voltage proportional to the measured range The offset of the zero range point and the span location point of full scale output may be set using the appropriate commands Best accuracy is obtained by loading the line with a 10K ohm resistor to the voltage loop return at the measurement point The brown wire is the voltage output return This line is switched internally to the 15V power supply return Analog Mode NPN Limit Switches Wire Color Orange Wire Color Brown Function NPN Limit Switch 1 Function NPN Limit Switch 2 In this mode the NPN limit switches can sink up to 150mA each to the black groun
55. ushing the switch on the end cap will stop the light from flashing stop the error message from transmitting and will start the sensor using the default factory configuration The sensor can also send this message as the result of the Read command If the sensor sends the message as a result of the read command the message is sent at the user s selected baud rate The baud rate will be changed to 9600 factory default when the switch on the end of the sensor is pressed The configuration commands do not automatically store the changes to the nonvolatile memory The Write command is used to make these changes permanent The Write command stores all configuration information so it can be used once after making several changes The Read command is used to restore the saved configuration from nonvolatile memory and will immediately replace the sensor s configuration settings The Write command should not be issued repeatedly under computer control in the course of normal operation since the nonvolatile memory expected lifetime is 1 000 000 writes 11 AR200 Command Set 11 1 The AR200 may be configured two different ways e Commands may be sent over the serial port e Commands may be entered manually by using the push button switch and acknowledgment LED on the end panel The serial port commands are alphanumeric ASCII characters Any device that can communicate over a serial port may send the commands Configuration settings may be reta
56. x FF terminator may be used to find the first data byte If one FF appears in any 3 characters it is the terminator If 2 FFs appear the third byte is the high order middle byte of the data frame 8 Analog Output Modes Two of the lines in the power signal cable not used in the basic configuration carry the optional analog signals 8 1 Current Loop Output In 4 20mA analog mode the analog lines will deliver a current which increases linearly from 4 mA at the zero point to 20 mA at the span point The zero range point the starting distance and the span point of full scale output may be set anywhere within the measurement range of the sensor See the Set Zero Point and Set Span Commands In the default configuration the current loop output is updated 5 times per second This may be increased or reduced with the Set Sample Rate Command using either the pushbutton on the back of the sensor or the S command over the serial port Best accuracy and noise immunity is obtained by connecting a 500Q resistor to the current return wire at the measurement point The default configuration is for calibrated output with the zero point at zero distance and the span at full scale The minimum current loop span is 5 of the full measurement distance of the sensor Attempts to set a smaller span will be ignored and the span will not be changed Setting the span to a value closer that the previously set zero point will reverse the direction

Laser Measurement sensor users manual

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