AML M2500 Decoder - Manual (Page 67)

The last digit in UPC bar codes is a MODULO 10 CHECK DIGIT. It is calculated in
the following manner:
1. From right to left, sum the digits in the odd positions.
2. Multiply this sum by 3.
3. From right to left, sum the digits in the even positions.
4. Add this sum to the product of step 2.
5. The modulo-10 check digit is the smallest number, which when
added to the sum of Step 4 produces a multiple of 10.
EXAMPLE: UPC bar code = 01234567890C where C is the
CHECK DIGIT.
1. Sum 0 + 8 + 6 + 4 + 2 + 0 = 20
2. Multiply 20 x 3 = 60
3. Sum 9 + 7 + 5 + 3 + 1 = 25
4. Sum 60 + 25 = 85
5. 85 + 5 = 90 (check digit = 5)
Therefore: UPC bar code - 012345678905
UPC VERSION E
UPC Version E is a six digit variation of the UPC symbology. The last digit indicates
the type of compression used. Because of this data compression process, the
version E symbol is often referred to as a zero-suppressed symbol.
173559 8
E - 2