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Acuity AccuRange Series User Manual

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AccuRange 4000™ Laser Rangefinder
AccuRange™ Line Scanner
User's Manual
LLL004001 – Rev. 2.7
For use with AR4000™ and Line Scanner
September 5, 2008
Acuity
A product of Schmitt Industries, Inc.
2765 NW Nicolai St.
Portland, OR 97210
www.acuitylaser.com

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  • Page 1 AccuRange 4000™ Laser Rangefinder AccuRange™ Line Scanner User’s Manual LLL004001 – Rev. 2.7 For use with AR4000™ and Line Scanner September 5, 2008 Acuity A product of Schmitt Industries, Inc. 2765 NW Nicolai St. Portland, OR 97210 www.acuitylaser.com...
  • Page 2 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.
  • Page 3 (RMA) number within the applicable warranty period. Acuity will not accept any returned product without an RMA number. 2. Ship the product to Acuity, 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.
  • Page 4 AR4000 User’s Manual LLL004001 – Rev 2.7...

  • Page 5: Table Of Contents

    Table of Contents 1. INTRODUCTION ......................1 2. GENERAL DESCRIPTION ..................2 2.1 M ..................3 ECHANICAL IMENSIONS 3. OPERATING GUIDELINES ..................4 4. SIGNAL AND POWER INTERFACE ................5 4.1 8 W ................ 5 OWER AND IGNAL ABLE 4.1.1 P ..........
  • Page 6 9.0 SERIAL COMMUNICATIONS ................. 19 9.1 O ..................19 UTPUT ORMATS 9.1.1 ASCII D ........19 ATA FORMAT ALIBRATED ISTANCE 9.1.2 ASCII D ......19 ATA FORMAT EVEL ENSOR UTPUTS 9.1.3 ASCII D .... 20 ATA FORMAT ISTANCE PLUS EVEL ENSOR UTPUTS 9.1.4 B...

  • Page 7: Introduction

    1. Introduction This section is a guide to getting started with the AccuRange 4000 and this manual. The AR4000 has a number of configurable parameters, but many applications can use it in its default configuration. The first sections of the manual that should be read are the General Description and the Operating Guidelines.

  • Page 8: General Description

    2. General Description The AccuRange 4000 is a laser diode based distance measurement sensor for ranges up to 50 feet, with 0.1 inch accuracy. There are three models, the 4000- LV, 4000-LIR, and 4000-RET. The 4000-LV emits visible light (red, 670 nm wavelength), while the 4000-LIR and 4000-RET uses near infrared light (780 nm wavelength).

  • Page 9: Mechanical Dimensions

    2.1 Mechanical Dimensions Figure 1 shows the mechanical dimensions for the AccuRange. The laser beam is emitted from the center of the front panel, and the central 2.5 inch diameter of the front panel is a collector for return light. The bottom of the sensor has 4 blind holes which are threaded for 6-32 bolts for mounting the sensor.

  • Page 10: Operating Guidelines

    3. Operating Guidelines Use protective eyewear whenever there is a risk of being exposed to the output beam of the 4000-LIR or 4000-LV. 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 the eyes without sensation or warning.

  • Page 11: Signal And Power Interface

    4. Signal and Power Interface The 4000 has 2 cables. In the default configuration, the cable with the 9 pin connector is a standard RS-232 serial port. If the 4000 is ordered with the RS-422 option, this cable is used for that. The other cable is an 8 pin power/signal cable. If the 4000 is ordered with a power supply, the power/signal cable will pass through the power supply.
  • Page 12 Line 3: Heater Power, 5 to 7 volts at 0-2 amperes, temperature dependent. Color: Orange Heater power and return may be optionally connected to supply power for temperature regulation within the sensor. The current drawn by the heater power circuitry depends on the difference between the ambient temperature and the hold temperature for which the sensor is configured.

  • Page 13: Power Supplies And Safety Interlocks

    Best accuracy is obtained by loading the line with a 500 ohm resistor to ground at the measurement point. Line 7: Ambient light output: 0 to 4 volts. 5 mA max. Color: Green This output provides a measure of the total optical energy received by the sensor, which is a combination of external illumination and the laser beam energy.
  • Page 14 volt power and heater lines, and the heater return line, are not connected. The table below shows the wiring for the 8 wire cable extending from the LIR and LV power supply boxes. Wire Function Direction No Connection Black Ground Orange No Connection Brown...

  • Page 15: Ir Interlock Box

    AR4000 With Power Supply 4.2.2 IR Interlock Box The IR Interlock box contains the same keyswitch and removable jack as the IR Power Supply. To access the switch and jack, remove the four screws in the power supply case and lift the top half of the case. All of the lines in the AccuRange Power and Signal cable are connected straight through, except that the red power line passes through the keyswitch and jack before powering the laser.
  • Page 16 IR Interlock Box Mechanical Dimensions 4000 LIR with Interlock Box AR4000 User’s Manual LLL004001 – Rev 2.7...

  • Page 17: Serial Interface Specification

    5. Serial Interface Specification 5.1 Hardware Port The default serial port in the AccuRange 4000 is a standard RS-232 port, which can be connected to an IBM or compatible 9 pin serial port. If the 422/485 option is ordered, the serial cable contains the wire pairs for point-to-point full duplex RS-422 communication.

  • Page 18: Installation

    6. Installation 6.1 Cabling 6.1.1 Standalone Cabling To use the AccuRange 4000 without a serial connection to a host computer, the only connections necessary are the power and ground lines, and the pulse width or current loop signal connection to your data display or recording equipment. See the Signal and Power Interface for wire connections.

  • Page 19: Initial Checkout

    (see the section on Configuration and Non-Volatile Storage). Configuration information may be restored by re-entering the desired configuration. Contact Acuity in the event of calibration data loss. In the event of slightly low voltage from the power supply, the sensor will stop transmitting data and the LED will blink rapidly (several times a second) until the power supply level is restored.

  • Page 20: Serial Communications Check

    If the power supply falls below 5 volts for more than 100 microceconds, the sensor will be reset to avoid unreliable operation that could damage it. If this occurs, the quality of the power supply and its ability to provide a constant voltage when there is noise on the AC line.

  • Page 21: Range Measurement Quality Check

    7.3.4 Range Measurement Quality Check The quality of a range measurement depends on many variables, some of which are discussed in the section on performance and measurement accuracy. Generally, the quality of the signal can be measured by taking a set of samples of a stationary target over a fixed time interval and computing the standard deviation of that set of samples.

  • Page 22: Performance And Measurement Accuracy

    8. Performance and Measurement Accuracy This chapter is a general discussion of factors that affect the sensor’s performance and is intended as background information to help with demanding applications. It is not needed for basic installation and configuration. The 4000-LIR and 4000-LV will detect diffuse reflections from objects of any color with the greatest sensitivity falling at about 8 feet, although short distances right up to the front face of the sensor can be measured.

  • Page 23: Detector Thermal Noise

    8.1 Detector Thermal Noise Range measurement accuracy at high sample rates is limited by thermal noise in the sensors’ detector. Typically, a range measurement will be made by timing a number of cycles of the output. The greater the number of cycles timed, the better the averaging or filtering of this noise will be.

  • Page 24: Other Factors Affecting Performance

    60 feet, the limitation would be a similar line with twice the slope. This is due to the fact that longer ranges make more time to resolve to the same precision. 8.5 Other Factors Affecting Performance In addition to noise, there are other factors that affect the indicated range output. The most significant of these is the amplitude of the return signal, or the reflectivity of the target.

  • Page 25: Serial Communications

    9.0 Serial Communications 9.1 Output Data Formats Data is transmitted from the AccuRange 4000 as 8 data bits with no parity and 1 stop bit. The data sent may consist of calibrated distance readings, uncalibrated sensor data, or both together in each sample. Data may be sent in ASCII or binary format.

  • Page 26: Ascii Data Format, Distance Plus Low Level Sensor Outputs

    In this configuration, each sample consists of characters as follows: 1 to 7 range characters (possible values from 0 to 4.19 million, decimal format), TAB, 1 to 4 signal strength characters (0 to 1023), TAB, 1 to 4 ambient light level characters (0 to 1023), TAB, 1 to 4 sensor temperature characters (0 to 1500 in 0.1 F per unit), <CR><LF>.

  • Page 27: Current Loop And Pulse Width Outputs

    10. Current Loop and Pulse Width Outputs One of the lines in the power/signal cable, not used in the base configuration, carries the optional current loop output or, if the sensor is configured for use with a High Speed Interface, the same line will have an uncalibrated pulse width output signal.

  • Page 28: Serial And Analog Output Performance Specifications

    Otherwise, the output will be the indicated sensor range, uncompensated for temperature, signal strength, and other effects. In the default configuration, the current 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’...

  • Page 29: Resolution

    If both the serial and current loop outputs are enabled, the maximum output rate is 1500 microseconds per sample for calibrated output. For uncalibrated output, the maximum serial output rate is 400 microseconds per sample, and the maximum current loop update rate is 300 microseconds per sample.

  • Page 30: Configuration And Non-Volatile Storage

    When operation continues, the calibrated range output will likely be incorrect, and sensor operation will be impaired. Contact Acuity for assistance. AR4000 User’s Manual LLL004001 – Rev 2.7...

  • Page 31: Accurange 4000 Command Set

    13. AccuRange 4000 Command Set All configuration of the sensor may be done via commands sent over the serial port or by using the push-button switch and acknowledgment LED on the back panel. The serial port commands are ASCII commands that may be entered under computer control or from the keyboard of a terminal connected to the port.

  • Page 32: Command Quick Reference

    the button until the LED has flashed 4 times. Release the button. The LED will flash 10 times, pause, flash 4 times, and the baud rate will be set to 2400. 13.1 Command Quick Reference One byte commands are shown below as ASCII Code:<Commandcharacter>. Multiple byte commands are shown as: ASCII Code: <Commandcharacter:>...
  • Page 33 Command Name Length Command Code Default Setting 1 byte ASCII Code: H Laser on Laser Power On Input switch code: 6 Laser Power Off 1 byte ASCII Code: L Input switch code: 7 2 bytes ASCII Code: A<Mode> English output Enable Serial Data Output (Mode: 1=English, 2=low level,...
  • Page 34 Command Name Length Command Code Default Setting 1 byte ASCII Code: R Read Configuration Data From EEPROM Input Switch Code:18 Write Configuration 1 byte ASCII Code: W1234 Data To EEPROM Input Switch Code:9 1 byte ASCII Code: I Reset Configuration to Factory Defaults Input Switch Code:15 Set Temperature Hold...

  • Page 35: Command Descriptions

    13.2 Command Descriptions The notation (Serial Entry Only) indicates that the command cannot be given using the pushbutton on the back of the sensor. Set Sample Interval 2-8 bytes ASCII Code: S <Interval> (20 <= Interval <= 9999999) Default: 200000 (5 Samples/second) Input switch code: 8<Sample Rate Code>...
  • Page 36 Set Zero Point (Calibrated) 1-6 bytes ASCII Code: Z[<Zero Point>] (0 <= Zero Point <= 99999) Default: 0 inches Input switch code: 1 Applies to serial and current loop outputs. Sets the zero point for the serial and analog current outputs to the value specified. If English output mode is enabled, the distance should be entered in 1/100ths of an inch.
  • Page 37 Set Span 1-8 bytes ASCII Code: U[<Span>] (0 <= Span <= 9999999) Default: 650 inches (undefined in uncalibrated mode) Input switch code: 2 Set the point at which the current loop output is set to its maximum value. 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 closer from the zero point to the span point.
  • Page 38 Laser Power Off 1 byte ASCII Code: L Input switch code: 7 Factory Default: Laser on. Turns the laser off. For both the 4000-LIR and 4000-LV, this command turns the laser off within 50 microseconds of reception. Enable Serial Data Output 2 bytes ASCII Code: A <Mode>...
  • Page 39 Disable Serial Data Output 2 bytes ASCII Code: T <Mode> Input switch code: 12 <Mode> Factory Default: English calibrated output enabled, Low level internal sensor data output disabled, flow control disabled. Disables the serial output data mode specified by the parameter. See the Enable Serial Data Output command.
  • Page 40 Set Analog Zero Current 6 bytes ASCII Code: J [<Currentlevel>] Input Switch Code: 3<Option Code> (Option Code = 1, 2) Factory Default: 4 milliamps Sets the current that the analog output will deliver when the measured distance is less than or equal to the zero point as set by the Set Zero Point command. If the current drops below this level, the interface has experienced a hardware failure.
  • Page 41 Reset Configuration to Factory Defaults 1 byte ASCII Code: I Input Switch Code: 15 Restores the operating configuration to the original factory defaults. May be used if the present state is unknown or inconvenient. This reconfiguration is NOT saved to EEPROM: The Write command must then be used to make this initialization permanent.
  • Page 42 Set Minimum Valid Amplitude 1-4 bytes ASCII Code: P[Amplitude] Input Switch Code: 17 Factory Default: 0 (Distance output calculated for all amplitudes) Sets the amplitude (signal strength) below which the calibrated distance output from the serial port and current loop will be zero. This may be used to detect and prevent what would be inaccurate readings resulting from low signal strength.

  • Page 43: Data Sheet: Summary Of Specifications

    14. Data Sheet: Summary of Specifications Download the most recent data sheet at www.acuitylaser.com/pdf/ar4000-data- sheet.pdf AR4000 User’s Manual LLL004001 – Rev 2.7...

  • Page 44: Accurange Line Scanner

    15. AccuRange Line Scanner 15.1 General Description The AccuRange Line Scanner consists of a motor with encoder and a mirror mounted on the motor. The mirror is machined from aluminum and coated with protected silver for high reflectance for both the 4000-LV and 4000-LIR. The mirror is encased in a cylindrical sleeve which together with the mirror forms a balanced system for minimum vibration when rotating.

  • Page 45: Scanner Installation And Use

    Applied Voltage Scanner Speed Scanner Current 1050 rpm 45 mA 10.0 2100 rpm 90 mA 12.0 2600 rpm 110 mA Typical Scanner Speed and Power 15.3 Scanner Installation and Use If the scanner was ordered and delivered with an AccuRange 4000, the sensor will be mounted together with the scanner.

  • Page 46: Line Scanner Data Sheet

    15.4 Line Scanner Data Sheet Download the most recent datasheet at www.acuitylaser.com AR4000 User’s Manual LLL004001 – Rev 2.7...

This manual is also suitable for:

Accurange 4000Ar4000

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