Opticon LMD 1135 user manual Avoiding Specular Reflection, Distance Max From Window Width

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Manual No. 25-ULPNR102-01; Mar, 2005

LMD 1135 Laser Fixed Mount Scanner

Readable Bar Code Width LMD 1135

(Field-of-View Specification Based Upon 40 Degree Sweep)

Distance Max.

from Window Width

2.0”2.8”

4.0”4.2”

8.0”7.2”

12.0”10”

The table above shows the field-of-view at various distances from the window. The field-of-view is the maximum width that the scanner is capable of reading. It is the distance from the left edge of the view to the right edge. A bar code label positioned anywhere within this field-of-view can be decoded. The field-of-view is also a measure of the widest bar code label that can be read. Remember: The width of a bar code label includes not only the bars and spaces but also the required white space (quiet zone) on each end.

Good design policy is to position the barcode at the midpoint of the scanner’s depth-of-field and at the center of the field-of-view. Do not position it near the extremes of the reading range.

2) Avoiding Specular Reflection

Do not position the scanner at an angle that causes the laser light to be reflected directly back into the scanner. This is called specular reflection. Too much reflected light can “blind” the scanner preventing a good decode. The recommended location is + 13 degrees off the perpendicular for optimal performance.

If the bar code label is located on a flat surface, specular reflectivity occurs between 0 to 8 degrees off perpendicular. (See diagram) If the bar code label is located on a cylindrical surface, such as a test tube, the angle of specular reflection is measured tangent to the curve. If the curved surface is also moving, there may be more than one position causing specular reflection. The following diagram indicates the area to avoid:

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Contents User’s Manual Manual No -ULPNR102-01 March OSE Command SetPage Contents Configuring the Scanner Technical SpecificationsScanner Servicing and Maintenance Introduction and Getting StartedSection Introduction and Getting Started Quick Start-Up ProcedureProduct Overview Page Physical Specifications Section Technical SpecificationsOptical Specifications Avoid specular reflection in the dead zone +/- 8 degrees JAN 13 R = 30 mm 1.2 or Electrical SpecificationsConnector Pin-outs RS232 Communications SpecificationsRS232 Signal Level RS232 Transmit / Receive Character FormatPin No Signal Environmental SpecificationsOrdering Information ModelAchieving Optimum Performance Section Positioning the Scanner for Optimum PerformanceDistance to the Bar Code Depth-of-FieldDistance Max From Window Width Avoiding Specular ReflectionQuality Bar Code Labels Measuring Scanner PerformanceTips for Insuring Highest Data Integrity Application Notes Tips for Achieving High ThroughputTips for Verifying the Presence of a Bar Code Programming Menus & Commands Section Configuring the ScannerDefault Settings Parameter Factory Default SettingTechnical Assistance and Support Section Application Engineering SupportCommon Causes of Poor Performance Modified and/or Customized ScannersSection Scanner Labeling Section Scanner Servicing and MaintenanceIEC 825-1 Class 1 Laser Device Appendices Appendix a ESC Computer Command CRWhat if you make a mistake? Reset All Defaults U2 Command U2Symbology Selection Global DefaultsOptions for UPC Options for EAN-8 & EAN-13Options for Code Prefix/Suffix Select Symbology forPrefix/Suffix of Numeric Characters Prefix/Suffix of Alpha CharactersSelecting the Read Mode Setting the Trigger & Auto-TriggerParallel Read Mode HandshakingXmit Error Trigger Enabled Mode only Scanner Timeout Trigger EnabledMode Quiet Zone OptionsAppendix C Command Description Global Default & Scanner ConfigurationsComputer Including prefix/suffixDescription Command Symbology SelectionSymbologies Bar CodeOnly EAN 13/8 +2 START/END Add/Activate Specific Bar Code SymbologiesAdd/Activate Specific Bar Code Symbologies Delete/Deactivate Specific Bar Code SymbologiesDisable all symbologies Options for UPC Bar Code Command DescriptionOptions for EAN-8 & EAN-13 Options for Code 39 & IT Pharmaceutical IT Pharmaceutical, enable Transmit of leading a Options for Codabar NW-7 Codabar NW-7 Format 5 Format Standard and Interleaved Options for Interleaved & Industrial 2String format Options for IataMeaning of Acronym Number of digits 15 totalOptions for Code-93 Options for Code-128 / EAN-128Fixing the Number of Digits Disable fixed length allCreating a Prefix and/or Suffix UPC-E +2 or +5 Setting Prefixes Identifying the SymbologyMSI/Plessey Setting Suffixes Identifying the Symbology Bar Code Command Description Direct Input of Numeric Characters Direct Input of Alpha Characters Direct Input of Alpha Characters Lower Case Direct Input of Control Characters ETBSUB Direct Input Characters Misc Bar Code Command Description START/END Code Identification & Characters/Digits TransmittedCommunication Parameters Communication Parameters Terminal HandshakingMs intercharacter delay Buzzer Operation Disable buzzerPositive & Negative Bar Codes Setting the Trigger & Auto-Trigger FunctionsTrigger Function Enabled S8 Trigger Function Disabled S7 Selecting the Read ModeAdd-on Wait Mode Applies to UPC/EAN only Parallel Read ModeParallel labels only Scanner Timeout Trigger Enabled Mode only Multiple Read Reset Time Quiet Zone Options Redundant Decoding Error Messages No decode / no label Transmitting Error Indications Trigger Enabled onlyGood Read LED Operation Appendix D Appendix E