Operating Internal Pdf Laser Scanners; Operating Internal Two Dimensional (2D) Imager Scanners - Psion Teklogix 7535 User Manual

3.8.5 Operating Internal PDF Laser Scanners

This scanner decodes PDF417 two-dimensional bar codes.
• Turn the hand-held on. Wait until the unit has booted up completely.
• Aim at the bar code and press the scan key or the trigger. The beam expands
into a rectangle covering the bar code to properly scan it. The scan beam
and a warning indicator are visible until a successful decode is achieved or
three seconds have elapsed.

3.8.6 Operating Internal Two Dimensional (2D) Imager Scanners

An imager scanner takes a snap shot of a single bar code or multiple bar codes (at
one time). It can find a bar code regardless of its orientation – that is, even a bar
code printed at a 45 degree angle to the hand-held will be decoded successfully.
Note: When scanning multiple bar codes, ensure that all of the desired bar
codes are within the field of view of the scanner. It is possible that even
when all bar codes are within the field of view, not all of them will be
decoded. Only successfully decoded bar codes are passed to the applica-
tion program. The application program then issues a warning, asking that
you scan the missing bar codes.
When scanning a single bar code, ensure that only the desired bar code is
within the field of view of the scanner.
Because imager scanners generally have a shorter depth of field than laser scanners,
some practise may be required to find the optimal distance from the types of bar
codes being scanned. Although the imager includes illumination LEDs, ambient
light will help the imager decode the bar codes, especially if the bar code is far from
the hand-held.
Important: Keep in mind that the imager scanner is a camera, and the LED
illumination is a flash. Glare can be an issue on reflective media
such as plastic coated bar codes, just as glare is an issue for pho-
tographers. When pointing at a shiny surface, either shift the bar
code to the side or top, or angle the bar code so that the glare
reflects away from the imager scanner.
• Turn the hand-held computer on. Wait until the unit has booted
up completely.
Chapter 3: Getting To Know Your 7535/7530

Operating Internal PDF Laser Scanners

Psion Teklogix 7535/7530 Hand-Held Computer User Manual
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