Oki 790, 791 Code, Postnet, Interleaved2 of

Code 128

Code 128 has 106 different characters, each of which can have any one of three different meanings depending on which code set (A, B, or C) is engaged. A special code at the beginning indicates which set is engaged: three shift codes are also available for use within the bar code to indicate a change in the code set engaged, as required.

Interleaved2 of 5

Inerleaved2 of 5 bar coding is used mainly in the distribution industry. Two digits are encoded: one in the bars and one in the spaces.

Postnet

Postnet bar coding is used by the U.S. Post Office for sorting mail by automated equip- ment. It incorporates a coding system using five bars and four spaces for each digit.

48 Operation