The basic principle of POS system is to first create the product information in the computer file, through the computer cash register online architecture, the bar code on the product can be read directly through the optical reading device on the cashier device (or directly enter the code by the keyboard) immediately can display the product information (unit price, department, discount...). Accelerate cash register speed and accuracy. The details of each sale (price, department, time period, customer level) are automatically recorded and then sent back to the computer by the online architecture. Through computer calculation processing, it can generate a variety of sales statistical analysis information as a basis for management. The POS machine reads the magnetic stripe information of the cardholder on the bank card through the card reader, the POS operator enters the transaction amount, and the cardholder enters the personal identification information (i.e., password). The POS sends the information through the UnionPay center to the card issuing bank system to complete the online transaction, give the successful information, and print the corresponding bill. The application of POS realizes the online consumption of credit cards, debit cards and other bank cards, ensures the safety, speed and accuracy of the transaction, avoids the complicated labor such as manual query blacklist and pressing orders, and improves the work efficiency.
