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3 Interleaved 2 of 5

Interleaved 2 of 5 is a numeric-only bar code, variable in length and bi-directional.

It is a high-density code that can hold up to 18 digits per inch (25.4mm) when printed

using a 7.5 mil X dimension. It is a general-purpose code whose only restriction is

that there must be an even number of characters in the data. For general-purpose,

free form numeric data, this is the most efficient code available. This makes the

symbols much denser than Code 39 in most cases. Interleaved 2 of 5 bar codes are

used throughout the shipping industry on the sides of corrugated boxes and are also

used by the medical industry and in laboratories.

The "Interleaved" part of the name comes from the fact that a digit is encoded in the

bars and the next digit is encoded in the spaces. The encoded digits are

"Interleaved" together. There are five bars - two of which are wide and three that are

narrow - and five spaces, two of which are wide. Each digit has its own unique 2 out

of 5 arrangement.

There are four different 2 of 5 codes, and all four share the following characteristics:

2 wide elements on 5 for the coding of each character, a set of numerical characters,

unlimited length. The Interleaved code offers the highest density of data by deleting

spaces between characters.

A complete Interleaved 2 of 5 symbol consists of a quiet zone, the start character

(narrow bar - narrow space - narrow bar - narrow space), the encoded data, the stop

character (Wide bar - narrow space - narrow bar), and a trailing quiet zone. An

optional calculated check digit, determined by the Modulo 10 algorithm, can be

added at the end of the string. Interleaved 2 of 5 must have an even number of

characters. If not, complete the code extreme by adding 0 to the beginning of the

line.

From UNIX or DOS it is necessary to send PCL escape sequences as part of the

print data to select the desired bar code font. The PCL escape sequences for the

fonts are shown on the PCL font list. Instructions on how to print the PCL font list are

given in your printer manual.

The escape sequences for the fonts on these products are:

Interleaved 2 of 5 - Regular : esc(3Yesc(s1p#v0s0b28673T

Interleaved 2 of 5 – Thin - Regular : esc(3Yesc(s1p#v0s0b28674T

(# : point size 0.25 - 999.75)

Replace the hash (#) with the relevant point size. For example, to print a bar code

that is one inch (25.4 mm) high, substitute '#' with '72'. To print a bar code half and

inch (12.7 mm) high, use 36.