Psion Teklogix 7535 G2 Manual de usuario descargar pdf (Pagina 91)

Chapter 3: Getting To Know Your 7535 G2

Operating Internal Two Dimensional (2D) Imager Scanners

Psion Teklogix 7535 G2 Hand-Held Computer User Manual 61

3.6.6 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.

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.

• Turn the hand-held computer on. Wait until the unit has booted up completely.

• Aim at the bar code and press the scan key or the trigger. Hold the trigger until a suc-

cessful or failed scan result is obtained.

• When the scan button or trigger is pressed, a red, oval shaped light (the framing marker)

is displayed. Centre the framing marker in the field—either in the centre of the bar code

you want to scan or in the centre of the area in which multiple bar codes are to be

scanned.

The illumination LEDs will flash (typically several times) and a picture of the bar code(s)

is taken.

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 application 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.

Important: Keep in mind that the imager scanner is a camera, and the LED illumina-

tion is a flash. Glare can be an issue on reflective media such as plastic

coated bar codes, just as glare is an issue for photographers. 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.

Most imagers take several ‘snap shots’ of the bar code in order to decode it.

It is normal for the LEDs to flash two or three times. Hold the unit steady

between flashes to improve decode performance.

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Psion Teklogix 7535 G2 Manual de usuario Pagina 91