Operating Internal Two Dimensional (2D) Imagers - Motorola 7545MBW User Manual

2 - 18 Omnii Hand-Held with Windows CE 6.0 User Manual

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.
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 pro-
gram 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.
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 includes
illumination LEDs, ambient light will help the imager decode the barcodes, especially if the barcode is far from
the hand-held.
IMPORTANT
• Turn the hand-held computer on. Wait until the unit has booted up completely.
• Aim at the barcode 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 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.
Keep in mind that the imager scanner is a camera, and the LED illu-
mination is a flash. Glare can be an issue on reflective media such
as plastic coated barcodes, just as glare is an issue for photogra-
phers. 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.