Specifications

365
Mod 10 and Mod 43 Check Digits
Mod 43 Check Digit
9/15/06 ZPL II Programming Guide 45541L-004 Rev. A
Mod 43 Check Digit
The calculations for determining the Mod 43 check Digit character are as follows:
Each character in the Code 39 character set has a specific value, as follows:
1. Add the sum of all the character values in the data string. Using the chart above, the sum
of the character values is as follows:
1 + 2 + 3 + 4 + 5 + 10 + 11 + 12 + 13 + 14 + 40 =115
2. Divide the total by 43. Keep track of the remainder.
115/43 = 2 Remainder is 29
3. The “check digit” is the character that corresponds to the value of the remainder.
Remainder = 29
29 is the value for the letter T.
T is the check digit.
Below is a bar code that illustrates the example. The character on the right, T, is the check
digit.
Example • Data string 2345ABCDE/
0=0
1=1
2=2
3=3
4=4
5=5
6=6
7=7
8=8
9=9
A=10
X=33
Y=34
Z=35
- =36
.=37
Space=38
$=39
/=40
+=41
%=42
M=22
N=23
O=24
P=25
Q=26
R=27
S=28
T=29
U=30
V=31
W=32
B=11
C=12
D=13
E=14
F=15
G=16
H=17
I=18
J=19
K=20
L=21