The actual system of numbering depends on the type of product and the purpose of the barcode the first digit of the barcode indicates the numbering system. The logic behind doing this is a little complicated, and involves a mathematical property called “parity,” but the effect is to reverse black and white, and to allow the scanner to tell whether it’s reading the code from left to right or from right to left. When a digit is used on the left side, the bars are black and the spaces are white, and when it is used on the right side, the colors are reversed. The middle symbol separates the left side and the right side, which are coded differently. A UPC-A barcode contains 12 digits, along with a quiet (blank) zone on either side, and start, middle, and stop symbols. UPC-A is strictly numeric the bars can only represent the digits from 0 to 9. The UPC-A (also referred to simply as the UPC) is the standard retail “price code” barcode in the United States. Barcodes can be divided into three general types: linear, stacked linear, and two-dimensional (or 2D): Linear Barcodes UPC-A Barcode 101: Guide to Barcode SymbologiesĪ barcode symbol is a machine readable image which conveys data.
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