
4
Look at the following samples of printed bar codes:
The classic bar code type is Code 39, (also called Code 3 of 9) which has 9 bars
and spaces; three are wide, and the other 6 are narrow. In Code 39, 3 of 9 total
bars and spaces are wide; hence the name, Code 3 of 9. For example, look at the
following character representations with Code 39:
Notice there are two widths of bars and two widths of spaces. If you want to
print a bar code of ABCDE, you need to start and end it with a special Start/Stop
code character -- the * (asterisk) is used for Code 39. To print a bar code of
ABCDE, you would need to enter the data as *ABCDE*. There should be at
least 1/4" of white space to the left and right of the code; this helps the bar code
reader pick out where a bar code begins and ends.
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