|
The Code 39Ext
barcode is an extended version of the Code 39 barcode and can
represent 128 characters from ASCII values 0 to 127.
A general Code39
code consists of 9 elements consisting of 5 lines and 4 gaps
separating them. Lines and gaps are divided into widths and
gaps, and no matter whether lines or gaps, only three elements
are wider than other elements by a certain ratio. Hence the name
code 39.
The Code 39
barcode is a barcode with an unfixed length, invented by
Intermec in 1974, and was originally used to identify auto
parts.
It consists of
nine units, three wide and six narrow, for a total of 44 encoded
characters.
The Code 39
barcode was the first alphanumeric barcode and was later widely
used in industrial fields.
Because it can
handle letters, CODE 39 was essential in the industrial field at
that time, used in factory automation industries such as
automobiles and electronics, and was also adopted by the US
Department of Defense as a military barcode.
|