Code 128 Auto can encode the complete ASCII-character set. This is done by switching between all 3 character sets of Code 128:
Code 128A: Includes upper case letters and control characters.
Code 128B: Includes upper and lower case letters.
Code 128C: Specially optimized for numbers.
This code uses an internal check digit that won’t be displayed in the text line under the code.
The EAN/UCC 128 is a special form of Code 128, mainly used for containers.