H-2
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. The
check character is derived by assigning a value to each character in the data
to be bar coded from the table as follows:
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
space
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
Table A-1. 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.
