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How to manually calculate checksum for Code 128

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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 come 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 11.1 year(s) ago

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Ben	Best Answer The Code 128 Check Character calculation process is complex. To avoid mathematical errors, IDAutomation urges you to encode data using a font encoder. Use the Code 128 chart to determine the Value for the character set to encode. The letter V for Code 128 B is 54. Generate the Code 128 B Check Character: 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 Need to get re-acquainted with long division? Long Division Help Posted 11.1 year(s) ago (0) (0) Report Abuse

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