It consists of
four barcodes of different heights, representing 0, 1, 2 and 3
respectively.
It can represent
numbers 0-9 and letters A-Z, and each character is represented
by four barcodes.
It contains a
format control code (FCC) that indicates the type and length of
the barcode.
It also contains
a checksum to detect whether the barcode is correct. |