Psion 2739D-7545MBW User Manual Download

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Chapter 3: Getting To Know Your Omnii
Operating One Dimensional (1D) Internal Laser Scanners

Psion Omnii Hand-Held Computer User Manual

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Is the laser beam scanning across the barcode?

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Once the scan beam has stopped, check the scanner window for dirt or fogging.

3.7.5

Operating One Dimensional (1D) Internal Laser Scanners

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

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Aim at the barcode and press the scan key or the trigger. A scan beam and a warning indicator appear
until a successful decode is achieved or six seconds have elapsed.

3.7.6

Operating Internal Two Dimensional (2D) Imagers

An imager scanner takes a snap shot of a single barcode or multiple barcodes (at one time). It can find a
barcode regardless of its orientation—that is, even a barcode 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 barcodes being scanned. Although the imager in-
cludes illumination LEDs, ambient light will help the imager decode the barcodes, especially if the barcode
is far from the hand-held.

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

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Aim at the barcode and press the scan key or the trigger. Hold the trigger until a successful or failed
scan result is obtained.

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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 barcode you want to scan or in the
centre of the area in which multiple barcodes are to be scanned.

The illumination LEDs will flash (typically several times) and a picture of the barcode is taken.

Important: If an aiming dot is available on the installed scanner, the dot will be enabled for a

configurable time period (including off), after which normal scanning begins. Refer
to “Dot Time (msec)” on page -5 for details.

Double-clicking the trigger will override the aiming delay and initiate an immedi-
ate scan. Note that the aiming dot is standard on long-range and high visibility
internal scanners.

Note: When scanning

multiple

barcodes, ensure that all of the desired barcodes are within the

field of view of the scanner. It is possible that even when all barcodes are within the field of
view, not all of them will be decoded. Only successfully decoded barcodes are passed to the
application program. The application program then issues a warning, asking that you scan
the missing barcodes.

When scanning a

single

barcode, ensure that only the desired barcode is within the field of

view of the scanner.

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 barcodes,
just as glare is an issue for photographers. When pointing at a shiny surface,
either shift the barcode to the side or top, or angle the barcode so that the glare
reflects away from the imager scanner.

Most imagers take several ‘snap shots’ of the barcode 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.