Codabar is a discrete, numeric code with special characters and four different start/stop characters. Each character is encoded as seven elernents, with two or three of the elements wide.
While Codebar has no check character, Automatic Identification Manufactures, Inc. (AIM) has a recommended check character. The sum of all character values is taken, including the Start and the Stop characters. The data character whose value that when added to the total equals a mutiple of 16 is the check character.

Linear barcode activex control supports codabar bar code.