Reference Guide
Table Of Contents
- About This Guide
- Chapter 1 Getting Started
- Chapter 2 Accessories Setup
- Chapter 3 Batch and Spectrum One Terminal Setup
- Chapter 4 Spectrum24 RF Terminal Setup
- Chapter 5 Operating the PDT 6800 Series
- Chapter 6 Maintaining the Terminal
- Chapter 7 Error Recovery and Troubleshooting
- Appendix A Null Modem Pin-outs
- Appendix B Keyboard Layouts
- Appendix C Communications Status Codes
- Appendix D Specifications
- Appendix E Boot-Up Quick Reference
- Appendix F 2D Scanner Drivers and Applications
- Numerics
- A
- B
- C
- D
- E
- F
- I
- K
- L
- M
- N
- P
- R
- S
- T
- U
- W
5-14
PDT 6800 Series Product Reference Guide
“Tall” PDF Bar Codes
If the PDF417 symbol is “tall,” the vertical scan pattern may not be high enough to cover it.
In this case, try a slow “up and down” scanning motion. With the raster pattern open, move
the terminal slowly down toward the bottom of the symbol, keeping the beam horizontal to
the rows, then slowly back up toward the top.
Figure 5-5. Scanning Tall PDF Bar Code
The scan beam does not have to be perfectly parallel with the top and bottom of the symbol.
Scanning Considerations
Usually, scanning is a simple matter of aim, scan, and decode, and a few quick trial efforts
master it simply and intuitively. However, two important considerations can optimize any
scanning technique — angle and range.
Aiming: Hold at an Angle
Do not hold the terminal’s scan window directly over the bar code.
Laser light reflecting directly back into the scan window from the bar code is known as
specular reflection. This strong light can “blind” the scanner and make decoding difficult.
The area where specular reflection occurs is known as a “dead zone”.