MS-520 Scan Head User's Manual P/N 83-000500 Rev E
Information and specifications in this manual are subject to change without notice. Copyright © 2007 by Microscan Systems, Inc., 1201 S.W. 7th Street, Renton, Washington, U.S.A. 98057 (425) 226-5700 FAX: (425) 226-8682 All rights reserved.
Table of Contents List of Illustrations .................................................................................. iv List of Tables.......................................................................................... iv About This Manual .................................................................................iv Keystroke Entries ....................................................................................iv Approvals .............................................................
List of Illustrations Figure 1-1 Back View of MS-520 Scan Head Scanning a Label ............... 1-2 Figure 1-2 Laser Beam Spot Types (not to scale) ..................................... 1-4 Figure 1-3 Scan Beam Types, Side Views ................................................ 1-4 Figure 1-4 Single Line and Raster Scan Patterns ..................................... 1-4 Figure 1-5 Scan Head to Decoder Cabling ................................................ 1-6 Figure 1-6 System Diagram .....................
Approvals This equipment is approved for use by the following organizations: • CDRH (Center for Devices & Radiological Health) • UL (Underwriters Laboratories, Inc.) • CSA (Canadian Standards Association) • TüV (Technischer überwachungs-Verein) (MS-520 only) Warning and Caution Summary Note: The MS-520 scan head is designed to be connected to the MS-3000 decoder (single or dual). When installed, direct current power for the scan head is provided by the deocder.
Safety Labels 1201 S . W . 7th S t . R enton, W A 98055 LIS TE D A C C E S S O R Y R U L 1 95 0 4K 68 CL AS S FIS NU MB ER SER IAL NU M BE R M ANU FACT UR E D M O DEL P R O D U C T C O N F O R M S TO D H H S 2 1 C F R S U B C H A P TE R J. U S E D W IT H M S - 30 00 D E C O D E R + 12V 50m A P A T E N T N O .
Introduction 1 Chapter Contents MS-520 Scan Head Description........................................................... 1-2 FIS Options .......................................................................................... 1-3 Interfacing with Decoders .................................................................... 1-6 The Scanning System ..........................................................................
1–Introduction Chapter 1 Introduction MS-520 Scan Head Description The MS-520 scan heads use a high-speed, ten-sided spinning mirror to direct laser beams across bar code labels (figure 1-1) and convert the reflected light to waveforms. To Microscan decoder Figure A-1 Back View of MS-520 Scan Head Scanning a Label Figure 1-1 shows a MS-520 scan head in operation.
FIS Options FIS (Final Instruction Sheet) numbers are assigned to each customer order. The MS-520 models are available in standard FIS options, listed in tables 1-1 and 1-2.
1–Introduction Chapter 1 Introduction Spot Options The laser beam on the scan head can be projected on the bar code label as a round or an oval spot, as shown in figure 1-2. Oval scan spot Round scan spot An oval spot is recommended for labels with voids, extraneous ink, or other imperfections. Figure A-2 Laser Beam Spot Types (not to scale) Scan Beam Options Scan beams (figures 1-3 and 1-4) are projected either as a single line or as a raster pattern, depending on the FIS option ordered.
FIS Options Scan beams projected across a label appear as a single scan line, as shown on the left label in figure 1-4. Raster Option The raster option projects ten individual scan lines through 2 degrees of arc with each rotation. Table 1-3 shows estimated heights of raster images at selected scan ranges, measured from the front of the scan head. Table A-3 Raster Heights per Label Distance Scan Range Raster Height 2 inches (50.8 mm) .10 inch (2.54 mm) 4 inches (101.6 mm) .17 inch (4.
1–Introduction Chapter 1 Introduction The Scanning System Figure 1-6 shows a possible scanning system setup.
Chapter Setup 2 2–Setup Chapter Contents Setup Goals ......................................................................................... 2-2 Label Orientation.................................................................................. 2-3 Ladder Orientation ....................................................................... 2-3 Picket Fence Orientation ..............................................................2-3 Angled Picket Fence Orientation .......................................
Chapter 2 Setup Setup Goals To achieve the desired number of scans required by the application, scan heads must be positioned so that the scan beam crosses a label within the read range. To accomplish this, refer to the range table, bar code label orientations, scan calculations, and scan head orientation, as described in this chapter. In addition, a read rate test (see your decoder user’s manual) should be performed to ensure that optimum scanning and decoding is occurring.
Label Orientation Label Orientation If the bar code label bars are parallel to the direction of travel, as shown in figure 1-1, the label is said to be in a ladder orientation; if the bars are perpendicular with the direction of travel, the label is said to be in a picket fence orientation (figure 1-2).
Chapter 2 Setup Angled Picket Fence Orientation The problems associated with picket fence can be minimized by slightly tilting the scan line (figure 2-). This allows a larger portion of the label to be scanned and increases the label placement area by “simulating” the ladder orientation. This of course is impractical with a short bar code height.
Tilt, Skew, and Pitch Tilt, Skew, and Pitch Tilt refers to the label rotation, relative to the scan head, as it rotates on the tilt axis, as shown in figure 2-4. Skew Axis Tilt Axis MS-520 Scan Head Pitch Axis 2–Setup Skew refers to the angle of the label, relative to the scan head, as it rotates on the skew axis, as shown in figure 2-4. MS-520 scan heads can be skewed to a maximum of ±40 degrees from the centerline.
Chapter 2 Setup Read Ranges A label must be within the read range—the zone, as measured from the front of the scan head bezel, in which a label can be reliably read. Scan Width cm 15 in. 6 10 5 4 5 3 2 0 1 0 5 1 2 10 3 4 15 5 6 2–Setup 10 25 9 20 6 15 5 4 10 Infrared Laser 7 Visible Laser 8 3 2 5 1 MS-520 0 0 in. cm Range Figure 2-5 MS-520 Scan Width and Range Figure 1-5 shows the read ranges of visible and infrared MS-520 scan heads.
Read Ranges Table 1-4 MS-520 Read Ranges and Scan Widths* Maximum Scan Width Narrow-Bar-Width Read Range .0047” (.119 mm) 1.75–3” (45–76 mm) 3” (76 mm) .0075” (.191 mm) 1–4” (25–102 mm) 4” (102 mm) .0075” (.191 mm) 2–5” (51–127 mm) 4.75” (121 mm) .010” (.254 mm) 1.5–6” (38–152 mm) 6” (152 mm) .015” (.381 mm) 1–7” (25–178 mm) 7.5” (191 mm) .020” (.508 mm) 1–9” (25–229 mm) 9.25” (235 mm) .030” (.762 mm) 4–10” (102–254 mm) 9.5” (241 mm) .040” (1.02 mm) 4–10” (102–254 mm) 9.
Chapter 2 Setup Calculating the Number of Scans To ensure reliable scanning, it is recommended that a minimum of five scans be applied to each label. 2–Setup The number of scans that a given label will receive can be calculated by formulas for both ladder and picket fence label orientations if the inputs listed below are known. • Scan Rate (SR) is the number of scans per second that a given scan head is capable of Label length emitting.
Calculating the Number of Scans Use the formula1 suitable for your application to predict the number of scans each label will receive.
Chapter 2 Setup Comparing Label Orientation Calculations When evaluating ladder versus picket fence orientations (figure 2-7), label height, label length, and scan width are critical parameters. Note that in both previous examples, a 1 inch square label yields the same number of complete scans (30). 2–Setup However, when label height or label length are changed, the resulting number of scans differs dramatically. For example, if both label height and label length are decreased to 0.
Chapter 3 Installation Chapter Contents This chapter provides instructions for mounting the MS-520 scan head, interfacing with a decoder, and initial operation. Before permanently mounting the scan head, you should have read chapter 2, “Setup” and be confident that the scan head's mounting position and orientation will allow it to read the application's labels at the maximum read rate and with the desired number of scans. MS-520 Scan Head User’s Manual 3-1 3–Installation Mounting the Scan Head......
Chapter 3 Installation Mounting the Scan Head The MS-520 scan head can be mounted directly to a mounting surface of your choice, or indirectly, via a mounting plate and a universal stand. (See “Optional Equipment” on page A-5.) To permanently mount the scan head: 1. Position the scan head in a dry place, devoid of sunlight, bright lights, or light from other sources. 2. Before mounting, ensure sufficient clearance at the rear of the scan head to allow for the 8-pin, RJ-45 connector and cable.
Cabling Cabling The standard cable supplied with a MS-520 scan head is 6 feet (1.83 cm) in length, wired with an 8-pin RJ-45 modular plug at each end. 1 1 8 8 Scan Head +12 VDC in -12 VDC in Ground +5 VDC in Scan Sync out Scan Head Disable in Video (-) out Video (+) out Bare wire 3–Installation 1 2 3 4 5 6 7 9 Decoder Figure 3-2 Scan Head/Decoder Interface Cable P/N: 61-130001-XX Cables are also available in lengths from 1 to 15 feet, and are represented by a cable part number.
Chapter 3 Installation Operational Tips Do: • Check the label for readability in the visible (670 nm) or infrared (780 nm) range. If there is any question about the readability of the label, contact your Microscan representative. • Check inputs (label speed, length, height, etc.) to ensure the minimum number of scans per label required for your application. • As much as possible, avoid excessive tilt, pitch, and skew of the bar code label.
Appendices Contents Appendix A — Scan Head Specifications ............................................A-2 Appendix B — Optional Equipment .....................................................A-5 Appendix C — Glossary of Terms .......................................................
Appendices Appendix A — Scan Head Specifications Except where otherwise noted, the following specifications are true for all MS-520 scan heads: Physical Length ............ 2.25 in. (57.15 mm) Width............... 2.25 in. (57.15 mm) Height.............. 2.25 in. (57.15 mm) Cable Length... 6 ft. (183 cm) standard Interface Connector RJ-45 8-pin modular socket Weight............. 8 oz. (227 g) Scanning Parameters Type ................ Rotating 10-sided mirror Scan Rate .......
Scan Head Specifications Laser Light Wavelength Safety class Operating life Visible Laser Infrared Laser 670 nm nominal CDRH Class II 50,000 hrs. @ 25° C 780 nm nominal CDRH Class I 400,000 hrs. @ 25° C Optical Composite read ranges for several Code 39 narrow-bar-width sizes at 2.5:1 wide-to-narrow bar ratios. See “Read Ranges” in chapter 2. Operating Ranges Visible Standard Range UHD Range 1 to 10 in. (2.54 to 25.4 cm) 1 to 4 in. (2.54 to 10.16 cm) Infrared 1 to 9 in. (2.54 to 22.86 cm) 1.
Appendices Electrical Power Requirements: +12 VDC @ 50 mA maximum, 20 mV p-p maximum allowed ripple -12 VDC @ 35 mA maximum, 20 mV p-p maximum allowed ripple +5 VDC @ 240 mA maximum, 200 mV p-p maximum allowed ripple Input Signals ................................... TTL high enable for laser-diode and motor (controlled by decoder software) Output Signals: Scan Sync: .... TTL level Video Out: ....
Optional Equipment Appendix B — Optional Equipment Mounting Plate Kit Part Number: 98-500002 To mount the scan head with the mounting plate, “pair up” the mounting plate’s four inner screw holes to the scan head’s mounting holes (see figure 3-1 in chapter 3, “Installation”) and attach plate to scan head. Next, mount entire assembly using the four outer holes on the plate. 3.3" (83.82 mm) 0.25" (6.35 mm) 2.1" (53.34 mm) Four countersunk holes, for attaching plate to scan head Four 0.156" (3.
Appendices Universal Stand The Microscan Universal Stand is available in 4-inch, 6-inch, and 10-inch flex models as well as a 7-1/4" extension kit. 4-inch, knob adjustable handle 98-200008 6-inch, knob adjustable head and foot 98-200007 10-inch flax neck, adjustable head 98-200006 7-1/4-inch extension kit 98-200024 MS-520 Adapter plate 98-200011 4 inch Universal Stand 6 inch Universal Stand 10 inch Flex Neck Universal Stand Mates to adaptor plate Ball joint Adjust knob 4" 10.16 cm 6" 15.
Glossary of Terms Appendix C — Glossary of Terms Bar Code. Data that has been encoded into an array of parallel bars and spaces of varying widths. Bar Code Density. Number of characters per inch or other unit of measure. Decoder. A device that analyzes digital input provided by the scan head and translates it into bar code information. Focal Length. The distance measured from the scan head to the center of the depth of field, or focal point. Label Height.
Appendices Round Spot. The standard laser beam as it appears on the label being scanned, sometimes slightly ovalized. Scan Head. The module that projects laser light on bar code labels and receives reflected light back. This device changes the analog signal to a digital representation of the bar code and outputs it to a decoder. Scan Rate. Number of scan lines created by the scan head per second. Scan Width.
Index A N Ambient Light Immunity A-4 Angled Picket Fence Orientation 2-4 Approvals v Number of Scans (setup objective) 2-2 C Cable Length A-2 Cabling 1-6, 3-3 Calculating the Number of Scans 2-8 Caution Summary v D O Object Detector Orientation 2-2, 2-5 Operating life A-3 Operating Ranges A-3 Operational Tips 3-4 Optional Equipment A-5 P H R Height A-2 Humidity A-4 Installation 3-1 Interface Connector A-2 Interfacing with Decoders 1-6 Raster Height 1-5 Raster Image A-3 Raster Option 1-5 read cyc
Index Spot Options 1-4 Standard features 1-2 T Temperature A-4 Tilt 2-5 Tilt (definition) A-8 U Universal Stand A-6 W Index Warning Summary v Warranty Information ii Wavelength A-3 Weight A-2 Width A-2 I-2 MS-520 Scanner User’s Manual
