1-3 digits: ***3 digits, corresponding to 692 of the barcode, is one of China's country codes. 690--695 are all codes for mainland China.
4-8 bits: ***5 bits, corresponding to 13179 of this barcode, represents the manufacturer code.
Bits 9-12: ***4 bits, corresponding to 0637 of this barcode, represent the in-plant commodity code.
Digit 13: ***1, corresponding to the 0 of the barcode, is the check digit, based on a certain algorithm, calculated from the previous 12 digits.
Equation 13 algorithm:
1, take out the number of odd bits of the sum, c1=6+2+3+7+0+3=21;
2, take out the number of even bits of the sum, c2=9+1+1+9+6+7=33;
3, the odd bits of the sum and the "even bits of the sum of the triple "Add. 21+33X3=120
4, take out the digit of the result: 120 digit 0;
5, subtract this digit with 10: 10-0=10;
6, take another digit to the obtained number: 10 digit 0.
Universal merchandise barcode is generally made up of the prefix part, Manufacturer's code, commodity code and check digit. The prefix code in the commodity bar code is used to identify the country or region code, the right to assign the code in the International Article Numbering Association, such as 00-09 on behalf of the United States, Canada, 45, 49 on behalf of Japan, 69 on behalf of mainland China, 471 on behalf of China Taiwan, 489 on behalf of the Hong Kong SAR.
China is given the manufacturer's code by the National Article Coding Center. Commodity code is used to identify the code of goods, the right to assign the code by the product manufacturer to exercise their own. Commodity bar code with 1 check digit at the end to check the correctness of the commodity bar code in the left from the first 1-12 digits of the code. Commodity bar code refers to a set of rules arranged by the bar, empty and its corresponding characters composed of signs, to indicate a certain commodity information symbols.
The bar is dark, empty light color, for bar code reading equipment scanning and reading. Its corresponding characters by a set of Arabic numerals, for people to read directly or through the keyboard to the computer to enter data to use. This set of empty bars and the corresponding characters represent the same information.
Expanded Information:
Barcode Usage:
Globally, the number of times barcode scanning is needed every day is more than hundreds of millions of times. The scope of its application involves various fields and industries, including logistics, warehousing, libraries, banks, POS cash registers, health care, retail merchandise, clothing, food service, and high-tech electronic products and so on.
At present, barcode applications are still being used every day in a number of new and growing projects. For example, in the logistics industry, logistics in the classification of goods, the allocation of storage space, storage query, inbound and outbound information, inbound and outbound inventory, product query and so on.
Baidu Encyclopedia - Barcode