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5.3.3.1 Symbol Character Structure
The sum of the bar modules in any symbol character is always even (even parity) and the sum of the space modules is, therefore, always odd. This parity featureenables character self-checking.
Figure 5.3.3.1 – 1
GS1-128 Bar Code Symbol Start Character A
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211412
Figure 5.3.3.1 – 2 illustrates the encodation of the symbol charactervalue 35, which represents data character C in code sets A or B or the digits 35 in code set C.
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131321
Figure 5.3.3.1 – 2
Symbol Character Value 35
Figure 5.3.3.1 – 3GS1-128 Bar Code Symbol Stop Character
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2331112
January 2006 – Version 7.0
© Copyright 2006 GS1
Section 5.3 - Page 6
GS1 General Specifications GS1-128 SymbologySpecifications
5.3.3.2 Data Character Encodation
Code 128 has three character sets, which are shown in Figure 5.3.3.2 – 1 as code sets A, B, and C.
GS1-128 Symbology specifies the identical character set,as defined by the International ISO/IEC 646 Standard, to ensure international compatibility. For more information see Figure 3.A.3 – 1.
The symbol character bar (dark bar) and space (light bar)patterns shown in Figure 5.3.3.2 – 1 represent the data characters listed under the columns for code set A, B, or C. The choice of code set depends on the Start Character, the use of code A, code B, or codeC characters, or the shift character. If the symbol begins with Start Character A, then code set A is defined initially. Code set B and code set C are similarly defined by beginning the symbol withStart Character B or C, respectively. The code set can be redefined within the symbol by using code A, code B, and code C characters or the shift character (see Section 5.3.3 for the use of specialcharacters).
The same data may be represented by different Code 128 Symbols through the use of different combinations of Start, code set, and shift characters. The individual applications do not...
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