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Update
Chapter 1
Understanding the Barcode Scanner
1.11 NEGATIVE BARCODES
Normally, barcodes are printed with the color of the bars darker than that of the spaces.
But for negative barcodes, they are printed in the opposite sense just like negative films.
The spaces of negative barcodes are printed with a color darker than that of the bars.
You can configure the scanner to be able to read negative barcodes.
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