Appendix F: Code128 Bar Code - Epson TM-T90 Specification

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APPENDIX F: CODE128 BAR CODE

F.1 Description of the CODE128 Bar Code
In CODE128 bar code system, it is possible to represent 128 ASCII characters and 2-digit
numerals using one bar code character that is defined by combining one of the 103 bar code
characters and 3 code sets. Each code set is used for representing the following characters:
• Code set A: ASCII characters 00H to 5FH
• Code set B: ASCII characters 20H to 7FH
• Code set C: 2-digit numeral characters using one character (100 numerals from 00 to 99)
The following special characters are also available in CODE128:
• SHIFT characters
In code set A, the character just after SHIFT is processed as a character for code set B. In
code set B, the character just after SHIFT is processed as the character for code set A. SHIFT
characters cannot be used in code set C.
• Code set selection character (CODE A, CODE B, CODE C)
This character switches the following code set to code set A, B, or C.
• Function character (FNC1, FNC2, FNC3, FNC4)
The usage of function characters depends on the application software. In code set C, only
FNC1 is available.
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