Code39Checksum - expect a checksum in Code 39 barcodes
When True the toolkit will only report Code 39 barcodes where the last character is a valid checksum for the rest of the barcode. The toolkit expects a Code 39 checksum to be calculated using modulus-43.
The following table shows the character and value used for the calculation…
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
e.g
Data = 12345ABCDE+
Sum of values: 1 + 2 + 3 + 4 + 5 + 10 + 11 + 12 + 13 + 14 + 41 = 116
115 / 43 = 2 rem 30, so U is the check digit.
Data and check digit = 12345ABCDE+U
Type: BOOL
Default value: FALSE
