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TheForumSurgeon

How to manually calculate checksum for Code 128

I’m trying to generate a code 128 B barcode string and I am having issues with the check digit. My Code 128 manual calculations come out to a “c” and the calculations from the check digit calculator comes out to a “p”. Where I am going wrong? My calculation for the string is:

1-X7VQBT

1 is 49
- is 45
X is 88
7 is 55
V is 86
Q is 81
B is 66
T is 84

104 +
49 X 1 +
45 X 2 +
88 X 3 +
55 X 4 +
86 X 5 +
81 X 6 +
66 X 7 +
84 X 8 =
2777 mod
103 =
99 = c


02-01-13     2422 day(s) ago    

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Ben

Best Answer

The Code 128 Check Character calculation for A,B, or C can be a complex process. To avoid mathematical errors, IDAutomation recommends our font encoders.

There are times when the manual check character calculation must be used, such as no font tool for the desired application.

When using the Code 128 chart, always pull the Value for the character set to encode; do not use the ASCII value. For example, the letter V for Code 128 B is 54.

image

To generate the check digit for the data as Code 128 B: 1-X7VQBT

1. Retrieve the value for each character.


1 is 17
- is 13
X is 56
7 is 23
V is 54
Q is 49
B is 34
T is 52

2. Calculate the total and the Start Character value. For Code 128 B, it is 104.
104 +
(17 x 1) +
(13 x 2) +
(56 x 3) +
(23 x 4) +
(54 x 5) +
(49 x 6) +
(34 x 7) +
(52 X 8) =
1625

3. Calculate the Checksum.
1625 divided by 103 = 15 with a remainder of 80.



The check character (checksum) is p.


NOTE:
If using Code 128 A, use Start 103.
If using Code 128 C, use Start 105.


CODE 128 C Check Digit Example


NOT FAMILIAR WITH LONG DIVISION

Long Division Help

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Posted 2422 day(s) ago

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