1 1 1 0 1 0 0 5 Base number 7 9 characters 6 Article number 3 5 characters 7 Check digit 2 Start character code 101 1 Delimiter code 01010 4 Stop character code 101 3 Scan area with 7 bars results in one digit respectively Example 9 1110100 EAN 13 barcode example composition and function The EAN 13 code is a European Article Number with 13 digits It is a one dimensional code The infrared or laser scanner distinguishes only between the refl ection of the light on the spaces and the non refl ection on the thin bars If the bar has a color this stands for digital code 1 a space in between corresponds to the digital code 0 The scanner is able to detect if several bars shown as white here in the layout although they are typically black or spaces are placed side by side and read them individually The result of the optical reading of the bars including their digital conversion corresponds exactly to the depicted sequence of numbers 12 digits represent the article number divided into a base number 5 with the country and company and the article number 6 The 13th digit is a check digit 7 which is calculated from the 12 digits according to a formula On the outside and in the middle every code is always delimited by the same start and stop characters 2 4 and the delimiter 1 Encoded are 6 digits to the left and 6 digits to the right of the delimiter Each digit 3 consists of 7 bits i e 7 times 1 or 0 but always exactly 2 bars and 2 spaces of varying thickness On the left hand side the encoding of all digits begins with a space and on the right hand side with a bar Consequently there are several charts for encoding the digits from 0 to 9 This ensures that the decoding is correct even when the barcode is read upside down 29

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