Barcode – Code 39
Code 39 is the most widely used linear symbology to encode alpha numeric information & it can be read by virtually any barcode reader. Code 39 (also known as Code 3 of 9, Code 3/9, USS Code 39, Code three of nine, or USD-3) is the first alpha-numeric symbology developed to be used in non-retail environment for various labels such as name badges, inventory and industrial applications.
It is widely used to code alphanumeric information, such as the model number etc. The Code 39 barcode is the easiest of the alpha-numeric barcodes to use and is designed for character self-checking, thus eliminating the need for check character calculations. Code 39 is capable of encoding 26 upper case letters, 10 digits and 7 special characters.
It Is called code 39 or three of nine because each character encoded is made up of 5 bars and 4 spaces for a total of 9 elements and 3 out of 9 element are always wide.
A complete code 39 barcode must include a start character * and a stop character *. In this way code 39 is self-checking.