Code 93, also known as ANSI/AIM Code 93, USS Code 93 is a continous, variable-length symbology. code 93 is used primarily by Canadian postal office to encode supplementary delivery information. Every symbol includes two check characters. Code 93 has a native character set of 26 upper case letters, 10 digits and 7 special characters.

Encoding
In Code 93, the number "1" represents a "dark" or "bar" section of the bar code whereas a "0" represents a "light" or "space" section of the bar code. Thus the numbers 1101 represents a double-wide bar (11), followed by a single-wide space (0), followed by a single-wide bar (1).

Check Sum
Every code 93 symbol must include two check characters which are referred to as "C" and "K". These two check characters immediately follow the encoded message itself and immediately precede the final stop character.

Code 93 Character Set
Code 93 starts with '*' and stops with '*'.
Code 93 Extended: Code 93 can encode 128 Full ASCII character, if the character is not included in the above table, then you need to encode it using the $, /, %, and + symbols as "shift" characters in the Extended Encoding Table.It is the same with the Code 39 Extended Encoding Table. Note that the characters $ ,% , / , and + in Code 93 Extended Encoding Table should use the replace one in above table.

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