Programmers Manuals

Appendix I: Barcodes
6/08 93 51195 Rev. 1
EAN-13 Encoding
To encode an EAN-13 Barcode, the digits are first split
into 3 groups, the first digit, the first group of 6 and the
last group of 6.
• The first group of six is encoded using a scheme
whereby each digit has two possible encodings,
one of which has even parity and one of which has
odd parity.
• The first digit is encoded by selecting a pattern of
choices between these two encodings for the next
six digits, according to the table below.
─ Unlike the other digits, the first digit is not
represented directly by a pattern of bars.
• All digits in the last group of six digits are encoded
using a single set of patterns which are the same
patterns used for UPC.
If the first digit is zero, all digits in the first group of six are encoded using the patterns
used for UPC, hence a UPC barcode is also an EAN-13 barcode with the first digit
set to zero.
Structure of EAN-13
First digit First group of 6 digits Last group of 6 digits
0
LLLLLL RRRRRR
1
LLGLGG RRRRRR
2
LLGGLG RRRRRR
3
LLGGGL RRRRRR
4
LGLLGG RRRRRR
5
LGGLLG RRRRRR
6
LGGGLL RRRRRR
7
LGLGLG RRRRRR
8
LGLGGL RRRRRR
9
LGGLGL RRRRRR
NOTE: Entries in the R-column are bitwise complements of the respective entries
in the L-column. Entries is the G-column are the entries in the R-column
reversed.
Encoding the digits
Digit L-code G-code R-code
0
0001101 0100111 1110010
1
0011001 0110011 1100110
2
0010011 0011011 1101100
3
0111101 0100001 1000010
4
0100011 0011101 1011100
5
0110001 0111001 1001110
6
0101111 0000101 1010000
7
0111011 0010001 1000100
8
0110111 0001001 1001000
9
0001011 0010111 1110100