Barcode card loading information via a series of numbers and alphabets which are all encoded strings according to a certain standard .
Different barcode have different specifications and application, details as below.
(1) Barcode coding technique
Barcode coding techniques mainly contains coding rules and standards.
The coding rule is the main basis when to develop the code standards and identify barcode types.
International universal bar code type ① UPC code
UPC code first used in United States which applied to a domestic business system since 1973 , this code with a fixed length 12 digits and mostly used for commercial application. ② EAN code
In 1977,the E.E.C. countries formulated EAN code for the European commodity code according to the UPC code standards. EAN code have 2 types: EAN-13 and EAN-8 ③Interleaved 2 of 5 Code
Interleaved 2 of 5 Code is a kind of digital code with a series of variable length numbers which can continuous self-calibration. ④ Code39
Code 39 is a kind of alphabetic code with a series of variable length letters which can discrete self calibration. ⑤ （codabar）Codabar is a kind of digital code with a series of variable length numbers which can discrete self calibration.
Codabar mostly used in management of the warehouse, blood banks and air express parcel. ⑥ Code 128
Code128 is a kind of combined code with a series of continuous and variable length numbers and alphabets. ⑦ China Post Code
China Post Code is the special code used by China Post express service. ⑧ other codes like : Code 93，Code 49，Code 2 of 5，Code 11，Matrix 2 of 5
Among all above mentioned barcodes, the commonly used barcodes in China are UPC code and EAN code. They’re general goods barcodes.
