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3.2.7. Start/Stop
This function activates the transmission of the start and stop characters (sign
NOT TRANSMITTED *
3.2.8. Modulo 43 Algorithm
Code 39 is strongly self checked and most situations do not require a check
character. If a specific application requires exceptional data security, a check
character can be added as the last character of the code.
Example:
Message: 12345/ABCDE
Sum of values: 1 + 2 + 3 + 4 + 5 + 40 + 10 + 11 + 12 + 13 + 14 = 115
Divide 115 by 43. The quotient is 2 with the remainder 29. The check character is
the character corresponding to the value of the remainder, which is 29 in this
example, corresponding to the character T.
The complete message, including check character is: 12345/ABCDET.
Numerical value assignments for computing the optional check character:
Character
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
START OF CONFIGURATION
IS1000 – Configuration Guide
Value
Character
0
F
1
G
2
H
3
I
4
J
5
K
6
L
7
M
8
N
9
O
10
P
11
Q
12
R
13
S
14
T
27
TRANSMITTED
Value
Character
15
U
16
V
17
W
18
X
19
Y
20
Z
21
-
22
.
23
Space
24
$
25
/
26
+
27
%
28
29
).
Value
30
31
32
33
34
35
36
37
38
39
40
41
42
END OF CONFIGURATION
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