
Appendixes
A - 3
APPENDIX B - CODE 39 SPECIFICATIONS
Code 39 is a variable length alphanumeric code. Each character is made up of nine elements, five
bars and four spaces. Three of the elements are wide and six are narrow. Code 39 is a popular
choice for applications because:
• it is easy to print with low cost dot matrix printers
• large character set (A-Z, 0-9, 7 special characters)
• code can be extended to include the entire 128 ASCII character set variable length
CHARACTERISTICS:
Character Set: 26 uppercase letters (A - Z)
10 digits (0 - 9)
7 special characters (SPACE -.$/+%)
Symbol Length: Variable
Check Digit: Optional
Bi-directional Decoding: Yes
Maximum Density: 9.8 char./inch (using .0075 inch narrow element)
An optional check character can be used for applications requiring higher levels of data security.
When used, the check character immediately follows the last data character. The check digit is
calculated as follows:
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