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Introduction
Interleaved 2 of 5 is based on Standard 2 of 5 symbology, but
uses both bar and space width to encode information so the density
of ITF25 is much higher. It is primarily used in the warehouse
industry.
Interleaved 2 of 5 encodes any even number of numeric characters
in the width of both bars and spaces.
It is called ˇ°Interleavedˇ± because 2 characters are encoded
in a unit of 5 bars and spaces. The even position character is
encoded into bars whilst the odd position character is encoded into
spaces. Thus, Interleaved 2 of 5 symbology can only encode data
elements with even number length.
Interleaved 2 of 5 is a numeric symbology and it character set
only include 10 digital characters.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Similar to Standard 2 of 5, the Interleaved 2 of 5 can include an
optional modulo 10 check digit.
Interleaved 2 of 5 is a continuous symbology.
Variants
- Interleaved 2 of 5 Mod 10
- USS ITF 2/5, I-2/5 or ITF 2of5
Structure of an Interleaved 2 of 5 Symbol
A typical Interleaved 2 of 5 barcode has the following structure:
- A start character bsbs
- Message encoded
- A stop character bbsb
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.
ITF-14
Another variant of Interleaved 2 of 5 is ITF-14 which
encodes EAN/UCC-14(also called SCC-14). Sometimes ITF-14 also
includes an add-on symbol with five-digit input followed by a
checksum digit. The add-on symbol is separated from the primary
symbol by white spaces.
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