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[edit]
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.
| 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.
| 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 |
| Start | 5 (L) | Separator | 3 (G) |
|---|---|---|---|
| 01011 | 0110001 | 01 | 0100001 |
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction