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A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...
The structure of the barcode is based on the checksum. In order to compute the checksum, multiply each of the digits by either 3 or 9, alternating each time. Then add them and then do a mod 10. So the checksum for 05415 MN is 1 based on the following calculations: 0*3=0 5*9=45 4*3=12 1*9=9 5*3=15 ----- 81 % 10 = 1
According to the IFPS guidelines, a five-digit code that begins with a "9" generally indicates organic produce. For example, organic bananas might carry the code "94011" instead of just "4011."
EAN-13 barcode. A green bar indicates the black bars and white spaces that encode a digit. C1, C3: Start/end marker. C2: Marker for the center of the barcode. 6 digits in the left group: 003994. 6 digits in the right group (the last digit is the check digit): 155486. A digit is encoded in seven areas, by two black bars and two white spaces.
Two out of every five bars or spaces are wide, giving the name "2 of 5", and each pair has a consistent width. The wide lines form a two-out-of-five code with consecutive values of 1, 2, 4, 7, and 0, where the code 0 is assigned to the value of 11. This is similar to the POSTNET bar code. Digits 01 23 45 67 89 encoded in ITF: a = quiet zones
The barcode scheme does not contain a check digit (in contrast to—for instance—Code 128), but it can be considered self-checking on the grounds that a single erroneously interpreted bar cannot generate another valid character. Possibly the most serious drawback of Code 39 is its low data density: It requires more space to encode data in ...
Example of Industrial 2 of 5 barcode. Industrial 2 of 5. [1] (also known as Standard 2 of 5 [2] [3] [4]) is a variable length, discrete, two width symbology. Industrial 2 of 5 is a subset of two-out-of-five codes. [5] Industrial 2 of 5 is one of the first 1D and oldest barcodes and can encode only digits (0-9).
A single 1 would be the thinnest line in the bar code. Three 1's in sequence (111) indicates a bar three times as thick as a single 1 bar. There are 108 possible 11-unit wide symbols, and the code uses all possible symbols. Two of the symbols are used for stop (end-of-barcode) indication, stop and reverse stop.