How it Works

Barcodes and scanners

Why does a barcode scanner read the same info on a barcode regardless whether the scanner is upside or not, when the barcode isn't symetrical from both sides.
Hope this makes sense, I know what I mean !

TIA

LeedsRhinos Fri 16/05/08 03:42

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dzug
Fri 16/05/08
09:30

Part of the barcode will indicate which way is 'up' so the reader will just invert what it sees if necessary.

heathfield
Fri 16/05/08
09:39

The scanner reads the label and does a number of check calculations, described here. If the calculations don't work out, the scanner tries again, with the beam moving backwards and forwards, until a proper checksum result is obtained. All this takes place very, very, quickly.

pieman65
Fri 16/05/08
16:28

dina

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