Psion Teklogix 7535 G2 Bedienungsanleitung PDF herunterladen (Seite 249)

WORKABOUT PRO Hand-Held Computer With Windows CE 5.0 User Manual 235

Chapter 6: Peripheral Devices & Accessories

Operating Two Dimensional (2D) Imagers

6.12.5 Operating Two Dimensional (2D) Imagers

An imager 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 imagers 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 photog-

raphers. 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.

• 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 successful 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.

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Psion Teklogix 7535 G2 Bedienungsanleitung Seite 249