Code 39 (USD-3)

Code 39, the first alpha-numeric symbology to be developed, is still widely used, particularly in non-retail environments. It is the standard bar code used by the United States Department of Defense, and is also used by the Health Industry Bar Code Council (HIBCC). Code 39 is also known as "3 of 9 Code" and "USD-3".

The following properties are specific to the Code 39 type and listed in the Property Grid under the Symbology property:

• Calculate a Checksum

  Specifies whether to calculate a checksum for the bar code.

• Wide Narrow Ratio

  Specifies the density of a bar code's bars.