Paxar 9401 manual Using Check Digits

4. Using Check Digits

2.Starting with the last digit before the check digit, assign weights, working right to left. Weights are a sequence of numbers the same length as the field. Digits in the field are multiplied by the weight digits to find addends for the check digit calculation.

When assigning weights, do not use the same number throughout. Do not assign a weight to the check digit.

4	3	8	2	7	C
6	5	4	3	2

3.Assign a number from 2 to 10 as the modulus. The modulus will be used in the check digit calculation.

Modulus = 10

4.Multiply each digit in the field by its corresponding weight digit.

4	3	8	2	7	C
6	5	4	3	2
24	15	32	6	14

5.Find the sum of all the digits in the products. Treat 2-digit numbers as two separate numbers. For example, add the digits in the number 24 separately as 2 and 4.

2 + 4 + 1 + 5 + 3 + 2 + 6 + 1 + 4 = 28

6.Calculate the first multiple of the modulus that is greater than the sum of the digits.

10 x 3 = 30 ( >28)

7.Subtract the sum of the digits from this number. 30 - 28 = 2

8.The resulting number is the check digit.

Check digit = 2

Bar code data = 438272

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Using Check Digits