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Introduction
Standard 2 of 5 was invented in early 1960s. Since then it has
been widely used in warehouse, photo finishing and airline
industries. It is also called industry 2 of 5.
Standard 2 of 5 is a numeric symbology and its character set
includes 10 digital characters:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
The symbology receives this name because every character is
encoded with 5 bars where 2 bars are wide. Code25 only uses bar
width to encode the data. Interleaved 2 of 5, however, uses both
widths of bars and spaces.
A complete Standard 2 of 5 barcode must include a start character
and a stop character. Optionally it ends with a modulo 10 check
digit.
Standard 2 of 5 is a very simple and low density symbology. Its
variant, Interleaved 2 of 5 (ITF25), has a slightly higher density.
Variants
Industry 2 of 5 ¨C Identical to Standard 2 of 5.
Standard 2 of 5 Mod 10 ¨C A modulo 10 check digit is
appended to the barcode message to perform checking.
Structure of a Code25 symbol
A typical Code25 barcode has the following structure:
- A start character
- Message encoded
- Optional Mod 10 check digit
- A stop character
Check Digit Calculation
• Start with the right-most digit in the message; mark the
character with even and odd position. The right-most digit has the
even position.
• Sum all digits in the odd position;
• Sum all digits in the even position, and then multiply by
3.
• Add the result 2 and result 3;
• Divide the result of step 4 by 10, the check digit is the
result equal to that 10 minus the remainder.
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