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Code 39 Advanced Features and Functions
Mod 43 Check Character
Standard Code 39 can be printed with a "Mod 43 Check Character".
This Mod 43 check character cannot be used with Full ASCII Code
39. Assigning a value to each character in the data to be bar coded from
the table as follows derives the check character:
Char value Char value Char value Char value
0 0 B 11 M 22 X 33
1 1 C 12 N 23 Y 34
2 2 D 13 O 24 Z 35
3 3 E 14 P 25 - 36
4 4 F 15 Q 26 . 37
5 5 G 16 R 27
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38
6 6 H 17 S 28 $ 39
7 7 I 18 T 29 / 40
8 8 J 19 U 30 + 41
9 9 K 20 V 31 % 42
A 10 L 21 W 32
Mod 43 Check character calculation for Code 39
Here is an example to illustrate how the check character is calculated
for bar code data of 123XYZ:
1. Take the sum of the values assigned to each character:
1 + 2 + 3 + 33 + 34 + 35 = 108
1 2 3 X Y Z
2. Divide the sum by 43: (thus the name modulus 43)
108/43 = 2 with a Remainder of 22
3. Find the character corresponding with the remainder.
M (value 22) is the CHECK CHARACTER
The data becomes 123XYZM, with M added as the Mod-43 check
character.