 INTERLEAVED
2 OF 5 — Popular in warehouse applications, Interleaved 2 of 5
(I 2 of 5) is a variable-length, numeric-only code. It gains its compactness by
encoding data in pairs of bars and spaces. This also guarantees there are always
an even number of digits. Interleaved 2 of 5 can contain up to 18 digits per inch
when printed using a 7.5-mil X dimension. A check digit is optional.Code 128 is
replacing I 2 of 5 in popularity.One concern with I 2 of 5 is that partial scans
can occur, especially with very long codes, if the scan beam exits the symbol
before scanning all the bars. Code 128 has a unique start/stop code which eliminates
the mis-read problem. To prevent this in I 2 of 5, include bearer bars. These
bars run along the top and bottom edges of the symbol in the scanning direction.
If a partial scan of the symbol occurs, the scanning beam will hit the bearer
bar and will not decode. |
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