Barcode system difference
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Seven, bar code system difference
UPC: (Uniform Product Code)
It can only mean that there are four versions A, B, C, D, and E. Version A-12 digit version E-7 digits. The last digit is the check digit. The size is 1.5 "wide and 1" high, and the background should be clear. Mainly used in the United States and Canada, used in industries, pharmaceuticals, warehouses and other departments. When UPC is decoded as twelve digits, the definition is as follows: The first digit = digital identification (already established by UCC (Uniform Code Committee)). The second 2-6 digits = the manufacturer's identification number (including the first digit) 7-11 = unique manufacturer's product code 12th digit = check digit (used for error detection)
Code 3 of 9:
It can represent letters, numbers and other symbols with a total of 43 characters: A -Z, 0-9,-. $ / +%, The length of the pace bar code can be changed, usually use "*" as the start and stop characters The check code does not have a code density between 3-9.4 characters per inch, and the blank area is 10 times that of the narrow strip. It is used for industrial, book, and ticket automated management.
Code 128:
Represents high-density data, the character string is of variable length, and the symbol contains a check code. There are three different versions: A, B, and C. 128 characters can be used in the three character string sets of A, B, or C, respectively. Industry, warehouse, retail and wholesale.
Interleaved 2-of-5 (I2 of 5):
Can only represent numbers 0-9 Variable length, continuous barcode, all bars and spaces indicate codes, the first number starts from the bar, the second number consists of empty The blank area is 10 times wider than the narrow bar, used in commodities In wholesale, warehouse, airport, production / packaging identification, industry, the barcode reading rate is high, which can be applied to fixed scanners for reliable scanning, and the highest density among all one-dimensional barcodes.
Codabar:
It can represent numbers 0-9, characters $, +,-, and four characters a, b, cd that can only be used as start / stop characters, variable length, no check digit, used in material management, books In the delivery of libraries, blood stations and current airport parcels, the blank area is 10 wider than the narrow bar, and the discontinuous bar code, each character is represented as 4 3 empty. Codabar aka NW 7, NW 7 is called in Japan.
PDF417 (QR code):
The multi-line barcode does not need to be connected to a database. It can store a large amount of data. It is used in hospitals, driver's licenses, material management, and cargo transportation. When the barcode is damaged, the error correction can make the barcode decode PDF417 correctly Products developed by Symbol Technology in 1990. It is a multi-line, continuity, variable-length, and contains a lot of data symbol identification. Each barcode has 3-90 lines, and each line has a start part, data part, and end part. Its character set includes all 128 characters, and the maximum data content is 1850 characters.
The one-dimensional barcode only expresses information in one direction (generally the horizontal direction), but does not express any information in the vertical direction. Its certain height is usually for easy alignment of the reader.
The application of one-dimensional bar code can increase the speed of information entry and reduce the error rate, but one-dimensional bar code also has some shortcomings:
* Small data capacity: about 30 characters
* Can only contain letters and numbers
* Barcode size is relatively large (space utilization is low)
* The barcode cannot be read after being damaged
Bar codes that store information in two-dimensional spaces in the horizontal and vertical directions are called 2-dimensional bar codes.
Like one-dimensional bar codes, two-dimensional bar codes have many different encoding methods, or code systems. As far as the coding principles of these coding systems are concerned, they can generally be divided into the following three types
1. Linear stacking QR code
It is generated by stacking multiple one-dimensional codes in the vertical direction based on the principle of one-dimensional barcode coding. Typical code systems are: Code 16K, Code 49, PDF417, etc.
2. Matrix QR code
It is encoded in a rectangular space by different distributions of black and white pixels in the matrix. Typical code systems are: Aztec, Maxi Code, QR Code, Data Matrix, etc.
3. Postal code
Encoding through bars of different lengths, mainly used for mail encoding, such as: Postnet, BPO 4-State.
In many types of two-dimensional barcodes, commonly used code systems are: Data Matrix, Maxi Code, Aztec, QR Code, Vericode, PDF417, Ultracode, Code 49, Code 16K, etc., among which:
* Data Matrix is ​​mainly used for the identification of small parts in the electronics industry. For example, this code is printed on the back of Intel's Pentium processor.
* Maxi Code was developed by the United Parcel Service (UPS) company for sorting and tracking of parcels.
* Aztec is launched by the Welch Allyn company in the United States and can accommodate up to 3832 numbers or 3067 alphabetic characters or 1914 bytes of data.