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7.6. Scanning Barcodes on Moving Items
Scanning barcodes on moving objects requires that the speed of the barcode be adjusted
to optimize the scanner's reading performance. The orientation of the barcode is another
consideration and plays an important part in determining the speed.
The barcode label can be oriented horizontally (ladder) and vertically (picket-fence). The
scanner's reading performance is improved when barcodes are moving vertically (see
Figure 9).
Scanning performance may differ depending on the moving speed of the barcode. The
achievable label speed can be calculated and depends on the following input values:
•
Scan speed = 200 scans/s
•
Redundancy = minimum 3 scans per label, plus the redundancy as set by user
•
Label height
•
Label speed
The label height and speed influence each other. It is necessary to keep enough height
between barcodes.
Figure 9: Barcode moving vertically
However, when scanning barcodes that are moving horizontally, the optical capabilities of
the scanner are reduced (see Figure 10). Therefore, be sure to stop the barcode for
about 200 ms when the barcode is aligned with the center of the scanner.
Figure 10: Barcode moving horizontally
When scanning barcodes on moving items as described above, scanning performance
may decline rapidly, depending on operating conditions.
16
Opticon
NFT 2200
Specifications Manual
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