Code 93 is an alphanumeric, variable length symbology designed to offer higher density and data security than Code39. The Canadian Postal Service uses code 93 when encoding supplemental delivery information.
Encoding
Code 93 can encode all 128 Standard ASCII values using a three-digit ASCII code, preceded by the character. For example, the carrot symbol ("^") corresponds to ASCII code \094. For a complete list of ASCII values, refer to the ASCII Table.
Structure
Code 93 has the following structure:
A start character - asterisk (*).
Encoded value.
First checkdigit "C".
Second checkdigit "K".
Stop character - asterisk (*).
Termination bar.
Requirements
Each Code 93 character contains nine modules arranged into three bars with adjacent spaces.
For an open system, the minimum value of the narrowest element (X) is 7.5 mils and the barcode height is 15 percent of the length or 0.25 inches. You must use the greater measurement. All characters end with a space - the termination bar appears after the last character (stop character) to determine the width of the trailing quiet zone. The leading and trailing quiet zone must be at least 0.25 inches. Toolkit automatically applies the asterisks in the encoded value and the checkdigits.
