C-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. 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
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
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.
