ISSN with an EAN-2 addon representing issue number 5.
The EAN-2 is a supplement to the EAN-13 and UPC-A barcodes. It is often used on magazines and periodicals to indicate an issue number.
Encoding
The encoding of EAN-2 characters is very similar to that of the other European Article Numbers. The only difference is that the digits are separated by 01. The EAN-2 always begins with "01011". Also, the R-Code is not used.
Encoding of the digits
Digit
L-code
G-code
0
0001101
0100111
1
0011001
0110011
2
0010011
0011011
3
0111101
0100001
4
0100011
0011101
5
0110001
0111001
6
0101111
0000101
7
0111011
0010001
8
0110111
0001001
9
0001011
0010111
The structure of the barcode is based on the value of the two digit to be encoded. The two digits treated as a single two-digit number is reduced modulo 4 and used to find the parity pattern to be used. The parity pattern repeats every 4 values.
EAN-2 Parity
Data to encode
Parity pattern
00
LL
Encode as 0 from L table followed by 0 from L table
01
LG
Encode as 0 from L table followed by 1 from G table
02
GL
Encode as 0 from G table followed by 2 from L table
03
GG
Encode as 0 from G table followed by 3 from G table
04
LL
Encode as 0 from L table followed by 4 from L table
05
LG
Encode as 0 from L table followed by 5 from G table
06
GL
Encode as 0 from G table followed by 6 from L table
07
GG
Encode as 0 from G table followed by 7 from G table
...
...
98
GL
Encode as 9 from G table followed by 8 from L table
99
GG
Encode as 9 from G table followed by 9 from G table
