Bar code is a kind of identifiable information identifier. It is a graphic composed of black bars and blanks of different widths arranged according to certain coding rules. It is an effective carrier of various information such as commodities, dates, banking systems, and postal management. Common commodity barcodes generally consist of a prefix part, a manufacturer code, a commodity code and a check code. The prefix code in the commodity barcode is the code used to identify the country or region.

Regarding the design of the barcode of the POS cash register system, there is no difference in principle between the design of the POS system using the barcode and the design of the general POS system. The difference between the two is that the former uses the barcode as the "front code", and automatically reads the barcode through a barcode reader, avoiding errors when manually entering the "front code", and improving the input speed and work efficiency, especially for supermarkets The benefit is more prominent, which can greatly reduce the waiting time of customers for shopping settlement.

The interface between the barcode reader, the cash register and the computer is usually divided into two types: keyboard simulation input and serial port input. In application programming, as long as you pay attention to what interface is used, programming is not difficult. Therefore, commercial enterprises that have realized computer management should seize the opportunity to promote the application of barcode management, and for commercial enterprises that have not realized computer management, they can consider using barcode management when designing computer management information systems.

Application and commercial POS cash register bar code, not only can improve the input speed, but also high reliability, large amount of collected information, flexible and practical and low cost, it is the preferred information carrier in shopping malls, supermarkets, retail, convenience stores, logistics industry and other fields .