| 摘要 |
A scanner is disclosed for scanning a bar code having a plurality of alternating bars and spaces of varying widths. The scanner comprises means for scanning a bar code sequentially across said bars and spaces for providing a bar code signature. The scanner comprises means for determining whether or not a readable bar code has been read correctly. The scanner is further arranged to operate in a first mode at a first scan speed when the bar code being scanned can be read and in a second mode at a second scan speed, when said bar code can not be read, said second scan speed being lower than said first scan speed.
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