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3–6 Operating the Scanner
Publication 2755-6.4
Specular Reflection
When the laser beam reflects directly back into the scanner from the
decode, it can blind the scanner and make decoding difficult. This is
called specular reflection.
To avoid this, scan the bar code so that the beam does not bounce
directly back. Do not scan at too oblique an angle; the scanner needs
to collect scattered reflections from the scan to make a successful
decode. Simple practice shows what tolerances to work within.
Tilt Back at Slight Angle (up to 30_)
1. Specular reflection; reflected
beam interferes.
2. No specular reflection. Decode
can occur.
Avoiding Specular Reflection
Bar Code Bar Code
- 2-D Hand-Held 1
- Bar Code 1
- Scanners 1
- Important User Information 2
- • identify a hazard 2
- • avoid the hazard 2
- • recognize the consequences 2
- Table of Contents 3
- Table of Contentstoc–ii 4
- Table of Contentstoc–iv 6
- Table of Contentstoc–vi 8
- • intended audience 9
- • contents of this manual 9
- • related publications 9
- • laser warning symbol 9
- Intended Audience 9
- Contents of this Manual 10
- Related Publications 11
- Laser Warning Symbol 11
- Scanner Features 12
- 1–2 Scanner Features 13
- Cable Connector 13
- LED Indicators 14
- Safety Labels 15
- Smart Raster 16
- Scanning Options 17
- Scanner Features 1–7 18
- Scanning Ranges 19
- • 1-D bar codes 19
- • 2-D bar codes 19
- Read Ranges 20
- 1-D Bar Codes 20
- 2-D Bar Codes (PDF417) 21
- 2-D Bar Codes 21
- Accessories 22
- • 8 ft. / 2.44 meter 22
- 1–12 Scanner Features 23
- • (Catalog No. 2755-HFN-K3) 24
- • (Catalog No. 2755-HTN-H1) 24
- Connecting the Scanner 25
- Overview 26
- • RS-232 Synapse cable 26
- Scanner Cable Connection 27
- • IBM PC/AT 32
- • IBM PC/XT and compatibles 32
- • IBM PS/2-30 32
- Scanner to PLC Connection 37
- Scanner to SLC Connection 38
- Operating the Scanner 39
- Scanning 2-D Bar Codes 41
- • Press the trigger 41
- Specular Reflection 44
- Dead Zone 45
- Beeper Indications 46
- This Response Indicates 47
- Configuring the Scanner 48
- Scanner Default Settings 49
- 4–4 Configuring the Scanner 51
- Code 39 Options 52
- UPC / EAN Options 53
- UPC / EAN Options (Continued) 54
- • system character only 54
- • no preamble 54
- Code Lengths 55
- Configuring the Scanner 4–9 56
- – Scan This Symbol First 57
- – <Prefix><Data> 57
- Decode Options 59
- – Pause Duration 59
- – 0 (under Pause Duration) 59
- – 5 (Under Pause Duration) 59
- – Decode Attempt Duration 60
- – 6 (under Pause Duration) 60
- – 0 (Under Pause Duration) 60
- Communication Setup (Synapse 62
- • Catalog No. 2755-HFC-SR2-01 63
- • Catalog No. 2755-HFC-SR3-01 63
- • RTS State Low (default) 66
- • RTS State High 66
- • Catalog No. 2755-HFC-SP1-01 70
- • Catalog No. 2755-HFC-SP2-01 70
- Settings 70
- • Medium 50 msec delay 72
- • Long 99 msec delay 72
- • Catalog No. 2755-HFC-SV2-01 74
- Synapse Cable Options 77
- • Catalog No. 2755-HFC-SV1-01 77
- • DEC VT 220/320 (default) 77
- • DEC VT420 77
- • Catalog No. 2755-HFC-SA1-01 80
- Chapter 6 85
- Troubleshooting the Scanner 86
- Cleaning the Scan Window 88
- A-B Technical Support 88
- Specifications 89
- Mechanical 90
- Environmental 90
- Laser Certifications 90
- Agency Certifications 90
- Scanner Pinout Connections 91
- ASCII Chart 92
- Undefined 94
- ALT Key Values 95
- Miscellaneous Key Values 95
- Numeric Key Values 96
- Extended Keyapd Key Values 96
- AIM Code Identifiers 97
- Advanced Data Formatting 99
- Publication 2755-6.4 100
- Advanced Data Formatting E–3 101
- E–4 Advanced Data Formatting 102
- Criteria 103
- E–6 Advanced Data Formatting 104
- Advanced Data Formatting E–7 105
- ADF Formatting Example 106
- Entering Rules bar code 107
- E–10 Advanced Data Formatting 108
- Advanced Data Formatting E–11 109
- • Third Rule 110
- • Second Rule 110
- • First Rule 110
- Default Rules 111
- European Union Directives 113
- F–2 European Union Directives 114
- Glossary 115
- G–2 Glossary 116
- Glossary G–3 117
- G–4 Glossary 118
- Glossary G–5 119
- G–6 Glossary 120
- Glossary G–7 121
- G–8 Glossary 122
- Glossary G–9 123
- G–10 Glossary 124
- Glossary G–11 125
- G–12 Glossary 126
- Glossary G–13 127
- G–14 Glossary 128
- Worldwide representation 134
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