| Please
note that most barcode printing software is capable of automatically
calculating a check digit and inserting it at the end of each
barcode value. The CODE39 Mod 43 calculation described below can
also be performed manually or by using your own program in rare
cases where the barcode printing software being used does not
have the option to calculate a CODE39 check digit automatically.
Check
Modulus 43
Some barcode printing
software packages are not capable of including a check digit
automatically. The rules for calculating a check digit are as
follows:
| Message: |
12345/ABCDE |
| Sum
of Values: |
1+2+3+4+5+40+10+11+12+13+14
= 115 |
| Check
Character: |
115/43
= 2.6744186 |
| Calculate
Check Value: |
Subtract integer
value: (2.6744186 - 2= .6744186) and multiply remainder
.6744186 * 43 = 28.999999 round up = 29 or check digit T
(see table 1 for corresponding check digit) |
| Insert
Check Digit: |
12345/ABCDET |
Enabling
BSCAN's CRC
To turn enable BSCAN's
check digit reading function, append the line in the [CONFIG1]
section of the BSCAN INI file that says BarTypes=CODE39 with
",CRC" so that it reads
BarTypes=CODE39,CRC
Please
note: Be
sure that check digits are present before using the CRC parameter
with the BarTypes function command. BSCAN will not read barcodes
without check digits if the CRC parameter has been added to
the BarTypes function command.
|
| CHECK
DIGIT |
CHECK
VALUE |
| 0 |
0 |
| 1 |
1 |
| 2 |
2 |
| 3 |
3 |
| 4 |
4 |
| 5 |
5 |
| 6 |
6 |
| 7 |
7 |
| 8 |
8 |
| 9 |
9 |
| A |
10 |
| B |
11 |
| C |
12 |
| D |
13 |
| E |
14 |
| F |
15 |
| G |
16 |
| H |
17 |
| I |
18 |
| J |
19 |
| K |
20 |
| L |
21 |
| M |
22 |
| N |
23 |
| O |
24 |
| P |
25 |
| Q |
26 |
| R |
27 |
| S |
28 |
| T |
29 |
| U |
30 |
| V |
31 |
| W |
32 |
| X |
33 |
| Y |
34 |
| Z |
35 |
| - |
36 |
| .
|
37
|
| Space
|
38
|
| $
|
39
|
| /
|
40
|
| +
|
41
|
| %
|
42
|
| |
|
