108
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.
