Check digits: Calculation of Modulo 43 :: Barcode software OCX ActiveX

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Calculating check digits: Modulo 43
This is a description of calculating check digits according to Modulo 43. ActiveBarcode calculates this check digits for most codes automatically.

Calculating a check digit according to Modulo 43:
Modulo 43 is used by the barcode symbology Code 39. Here is an example of how to calculate the check digit according to Modulo 43:

Code ("159AZ")	1	5	9	A	Z
Reference numbers	1	+5	+9	+10	+35	= 60 (Sum)
60 / 43 = 1 rest 17
The check digit is "H" (reference number 17)

*The reference numbers of Code 39 are:

00 0
01 1
02 2
03 3
04 4
05 5
06 6
07 7
08 8
09 9
10 A

11 B
12 C
13 D
14 E
15 F
16 G
17 H
18 I
19 J
20 K
21 L

22 M
23 N
24 O
25 P
26 Q
27 R
28 S
29 T
30 U
31 V
32 W

33 X
34 Y
35 Z
36 -
37 .
38 Space
39 $
40 /
41 +
42 %

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