Barcode identification of retail commodities consists of global trade commodity number (GTIN) and its corresponding bar code symbol. The barcode identification of retail goods mainly adopts EAN/UPC barcode. A can of beer, a bottle of shampoo and a bottle of conditioner can all be sold as retail goods to end consumers.
The identification code of non-retail goods consists of global trade commodity number (GTIN) and its corresponding bar code symbol. Bar code symbols of non-retail goods mainly adopt ITF- 14 bar code or UCC/EAN- 128 bar code, and EAN/UPC bar code can also be used. A carton containing 24 cigarettes and a tray containing 40 boxes of cigarettes can be used as non-retail goods for wholesale and distribution.
The bar code of logistics unit is a temporary combined package for convenient transportation or storage, which needs to be tracked and managed separately in the supply chain. By scanning the bar code label on each logistics unit, the link between logistics and related information flow can be realized, and the physical movement of each logistics unit can be tracked separately.
The code of the logistics unit is identified by the serial number of the cargo packing box (SSCC- 18). A box of 12 skirts and 20 jackets of different colors and sizes, and a tray containing 40 boxes of drinks (each box 12 box) can be regarded as a logistics unit.
Extended data
principle of operation
1, recognition principle
To convert the bar code compiled according to certain rules into meaningful information, it needs to go through two processes: scanning and decoding.
The color of an object is determined by the type of light it reflects. White objects can reflect various wavelengths of visible light, while black objects absorb various wavelengths of visible light. Therefore, when the light emitted by the light source of the barcode scanner is reflected on the barcode, the reflected light shines on the photoelectric converter inside the barcode scanner, and the photoelectric converter converts it into corresponding electrical signals according to the reflected light signals with different intensities.
According to different principles, scanners can be divided into four types: light pen, red CCD, laser and image. The electrical signal is output to the amplification circuit of the barcode scanner to enhance the signal, and then sent to the shaping circuit to convert the analog signal into a digital signal. The widths of white bars and black bars are different, and the duration of corresponding electrical signals is also different. The main function is to prevent the width of the dead zone from being insufficient.
Then the decoder judges the number of bars and spaces by measuring the number of pulse digital electrical signals 0, 1. The width of bars and spaces is determined by measuring the duration of 0, 1 signal.
The data obtained at this time is still quite confusing. In order to know the information contained in bar code, it is necessary to convert bar code symbols into corresponding digital and character information according to the corresponding coding rules (such as EAN-8 code). Finally, the detailed information of the article is identified by the computer system, and the data is processed and managed.
2. Scanning principle
The scanning of bar code needs a scanner. The scanner uses its own light source to illuminate the bar code, and then uses a photoelectric converter to receive the reflected light and convert the brightness of the reflected light into a digital signal. No matter what rules are adopted to print bar codes, they are all composed of dead zones, start characters, data characters and end characters. Some barcodes also have a check character between the data character and the termination character.
Baidu encyclopedia-barcode
Baidu Encyclopedia-Commodity Barcode