❏
Human Readable Information - The in
-
formation encoded in a bar code may be rep
-
resented in human-readable form below the
printed bar code symbol. This human-
readable representation is optional with
some bar codes while mandatory with oth
-
ers.
❏
Fixed vs. Variable Length - Some bar
code symbologies vary in length, contingent
upon the amount of information that needs
to be represented. Other symbologies have a
fixed length and always contain the same
amount of encoded information.
❏
“X” Dimension - Each bar code symbol
has a defined “X” Dimension, or narrow bar.
This bar is measured in thousandths of an
inch (or “mils”) and directly affects the physi-
cal size of bar code.
❏ Modular vs. Binary - With a modular bar
code information is encoded using bars and
spaces which vary from one to four.
Q.How can I find more information about
bar codes?
A. A good resource of bar code information is
“The Bar Code Book” by Roger C. Palmer .
©1989, 1991 by Helmers Publishing, Inc., Pe
-
terborough, New Hampshire, U.S.A.
ISBN 0-1911261-05-2
D-2 980009-001 Rev.F
Appendix D - Bar Code Information
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