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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.

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 125 126

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