Structure of a code 39 barcode

A typical code 39 barcode has the following structure:

Check Digit Calculation

To calculate the optional checksum digit, follow the following steps.

CODE39 CHAR TABLE
Ch Val Ch Val Ch val ch Val
0 0 A 10 N 23 - 36
1 1 B 11 O 24 . 37
2 2 C 12 P 25 sp 38
3 3 D 13 Q 26 $ 39
4 4 E 14 R 27 / 40
5 5 F 14 S 28 + 41
6 6 G 16 T 29 % 42
7 7 H 17 U 30
8 8 I 18 V 31
9 9 J 19 W 32
K 20 X 33
L 21 Y 34
M 22 Z 35
  1. Take the value (0 through 42) of each character in the barcode. The start and stop characters are not included in the checksum calculation.
  2. Sum the value of each of the values of each of the characters described in step 1.
  3. Divide the result from step 2 by 43.
  4. The remainder from the division in step 3 is the checksum character that will be appended to the data message before the stop character.

Code 39 Extended

The code 39 symbology can be extended to encode all 128 characters in the ASCII table. In the full ASCII mode, the symbols $ / % and + are used as precedence codes with the 26 letters as shown below. Since the same symbol now can be interpreted as one character in Extended Code 39 mode and two characters in Code 39 mode, the readers must be set to extended mode to read the data correctly. We listed the mapping chart at the left. Code39 extended is sometimes called Code39 Full ASCII.

More Barcode 39 Information

Extended Barcode 39

More Morovia Barcode Fonts