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Here's why bar code 1 is wider:
The 8 numbers in each example appear in groups of
four or more, and they appear in even-numbered
quantities, therefore, all 8 numbers will use code C.
The 6 alphabetic characters will use code B.
Look at the example again. This time, data is underlined when
the character set changes.
The bar code for data arranged like this:
Data = 1234ABC5678DEF
is wider than data arranged
like this:
Data = 12345678ABCDEF
This shows that bar code width varies depending on how data
is arranged. Separating numeric and alphabetic characters
reduces the number of character set changes. Fewer
character set changes reduce bar code width.
Bar code 1
Bar code 2
Appendix B: Code 128 Information
B-3
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