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Center Bar (01010– 3 white bars and 2 black bars) which represents the number 6, and
separates the design.
Right Hand Guide Bar (101– 2 black bars and 1 white bar) represents the number 6, and
tells the computer that the information is complete.
The regular size of the bar code is 1.469” X 1.020,” but it can be printed from 80% of
that size, to twice that size. It must appear in a rectangular block on the bottom, side or
back panel of a product, or anywhere it can be scanned. The bar code is a series of black
and white parallel bars, 30 black and 31 white (for 10 digits), with white margins on each
side. Each digit of the code is represented by two black bars, and two white bars, which is
composed of seven data elements or ‘modules.’ A module may be white or black. A
white or black bar can be made up of 1, 2, 3, or 4 modules. Modules are all the same
width, being that they are the foundation of the system, and create the bars which are
visible to the naked eye.
If you look at the diagram of the UPC symbol, you will notice that the symbol is split into
two sides, a left-hand side, using an odd number of modules; and a right-hand side, using an even
number of modules, making them opposite of each other. Thus, it doesn’t matter if the symbol is
entered upside-down. For each set of 7 modules is a number, and each number is represented by
a field whose optical bars are broken down into the following binary codes, where 0 = a blank
space, and 1 = a black bar:
Set 1 (left side)
0 - 0001101
1 - 0011001
2- 0010011
3 - 0111101
4 - 0100011
5 - 0110001
6 - 0101111
7 - 0111011
8 - 0110111
9 - 0001011
Set 2 (right side)
0 - 1110010
1 - 1100110
2 - 1101100
3 - 1000010
4 - 1011100
5 - 1001110
6 - 1010000
7 - 1000100
8 - 1001000