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Corrected factual errors in specification. Mostly semantic changes, but they do have a measurable effect on the outcome. See discussion page.
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==Encoding==
==Encoding==


The Encoding of EAN 5 characters is very similar to that of the other [[European Article Number]]s. The only difference is that a 1 is appended to the beginning and a 0 to the end. So the EAN 13 G-code for the number 3 is '0100001', the EAN 5 number is '1 0100001 0'. The EAN 5 always begins with '0101.' Also, the R-Code is not used.
The Encoding of EAN 5 characters is very similar to that of the other [[European Article Number]]s. The only difference is that the digits are separated by 01. The EAN 5 always begins with '01011.' Also, the R-Code is not used.


{| class="wikitable" style="text-align:center"
{| class="wikitable" style="text-align:center"
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! Digit !! L-code !! G-code
! Digit !! L-code !! G-code
|-
|-
| <tt>0</tt> || <tt>1 0001101 0</tt> || <tt>1 0100111 0</tt>
| <tt>0</tt> || <tt>0001101</tt> || <tt>0100111</tt>
|-
|-
| <tt>1</tt> || <tt>1 0011001 0</tt> || <tt>1 0110011 0</tt>
| <tt>1</tt> || <tt>0011001</tt> || <tt>0110011</tt>
|-
|-
| <tt>2</tt> || <tt>1 0010011 0</tt> || <tt>1 0011011 0</tt>
| <tt>2</tt> || <tt>0010011</tt> || <tt>0011011</tt>
|-
|-
| <tt>3</tt> || <tt>1 0111101 0</tt> || <tt>1 0100001 0</tt>
| <tt>3</tt> || <tt>0111101</tt> || <tt>0100001</tt>
|-
|-
| <tt>4</tt> || <tt>1 0100011 0</tt> || <tt>1 0011101 0</tt>
| <tt>4</tt> || <tt>0100011</tt> || <tt>0011101</tt>
|-
|-
| <tt>5</tt> || <tt>1 0110001 0</tt> || <tt>1 0111001 0</tt>
| <tt>5</tt> || <tt>0110001</tt> || <tt>0111001</tt>
|-
|-
| <tt>6</tt> || <tt>1 0101111 0</tt> || <tt>1 0000101 0</tt>
| <tt>6</tt> || <tt>0101111</tt> || <tt>0000101</tt>
|-
|-
| <tt>7</tt> || <tt>1 0111011 0</tt> || <tt>1 0010001 0</tt>
| <tt>7</tt> || <tt>0111011</tt> || <tt>0010001</tt>
|-
|-
| <tt>8</tt> || <tt>1 0110111 0</tt> || <tt>1 0001001 0</tt>
| <tt>8</tt> || <tt>0110111</tt> || <tt>0001001</tt>
|-
|-
| <tt>9</tt> || <tt>1 0001011 0</tt> || <tt>1 0010111 0</tt>
| <tt>9</tt> || <tt>0001011</tt> || <tt>0010111</tt>
|}
|}


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141 % 10 = 1
141 % 10 = 1


Once you have the checksum digit, you can lookup the structure in the following table. Note that the checksum digit is not in the final 5 digits.
Once you have the checksum digit, you can lookup the structure in the following table. Note that the checksum digit is not in the final 5 digits, and is not intended to validate the 5 digit data, but rather to validate the reading of the EAN-5 overall.


{| class="wikitable" style="text-align:center"
{| class="wikitable" style="text-align:center"
|+Structure of EAN-5
|+Structure of EAN-5
|-
|-
! Cecksum !! Structure
! Checksum !! Structure
|-
|-
| <tt>0</tt> || <tt>GGLLL</tt>
| <tt>0</tt> || <tt>GGLLL</tt>
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| <tt>9</tt> || <tt>LLGLG</tt>
| <tt>9</tt> || <tt>LLGLG</tt>
|}
|}

{| class="wikitable" style="text-align:center"
|+Example - encoding 52495
|-
! Start !! 5 (G) !! Separator !! 2 (L) !! Separator !! 4 (G) !! Separator !! 9 (L) !! Separator !! 5 (L)
|-
| <tt>01011</tt> || <tt>0111001</tt> || <tt>01</tt> || <tt>0010011</tt> || <tt>01</tt> || <tt>0011101</tt> || <tt>01</tt> || <tt>0001011</tt> || <tt>01</tt> || <tt>0110001</tt>
|}



==References==
==References==

Revision as of 09:57, 4 September 2008

The EAN/5 is a supplement to the EAN-13 barcode used on books. It is used to give a suggestion for the price of the book.

First Digit Description
5 $ US
6 $ Canada
4 $ New Zealand
3 $ Australia
0 & 1 British pounds

ISBN Encoding – Country and Currency Values Description

Value Definition
50000 NACS Trade
59999 Price for $100 and more
90000 NACS New
90000-98999 For internal purposes (BISG recommend 90000 if no price is given)
99000-99999 Reserved for the industry market
99990-99999 Reserved for National Association of College Stores (NACS)
99990 NACS used
99991 NACS copies

Encoding

The Encoding of EAN 5 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 5 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 checksum. In order to compute the checksum, multiply each of the digits by either 3 or 9, alternating each time. Then add them and then do a mod 10. So the checksum for 52495 is 1 based on the following calculations: 

    5*3=15
    2*9=18
    4*3=12
    9*9=81
    5*3=15
  ----------
     141      %    10  = 1

Once you have the checksum digit, you can lookup the structure in the following table. Note that the checksum digit is not in the final 5 digits, and is not intended to validate the 5 digit data, but rather to validate the reading of the EAN-5 overall.

Structure of EAN-5
Checksum Structure
0 GGLLL
1 GLGLL
2 GLLGL
3 GLLLG
4 LGGLL
5 LLGGL
6 LLLGG
7 LGLGL
8 LGLLG
9 LLGLG
Example - encoding 52495
Start 5 (G) Separator 2 (L) Separator 4 (G) Separator 9 (L) Separator 5 (L)
01011 0111001 01 0010011 01 0011101 01 0001011 01 0110001


References

NACS Codes

Barcode Reference - Section 6.1.46.2

Barcode Writer - The basis for the barcode structure

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