Credit cards can be swiped through pos machines, and spending by swiping through pos machines is the main way to use credit cards.
However, it should be noted that you can't use your own pos machine to swipe your credit card, because such an operation may involve illegal cashing. Illegal cashing refers to changing the use of funds through false transactions and using the cashed funds for illegal purposes. This will not only disturb the normal financial order, but also have a serious impact on the credit history of cardholders.
Basic principle of pos machine:
The basic principle of POS system is to create commodity data in a computer file, directly read the barcode on the commodity through the online structure of the computer cash register and the optical reading device on the cash register equipment (or directly input the code through the keyboard), and then display the commodity information (unit price, department, discount ...) immediately, so as to speed up the cash register and correct it.
The detailed information of each commodity sale (price, department, time period and customer level) is automatically recorded and then sent back to the computer by the online framework. Through computer calculation and processing, various sales statistics and analysis information can be generated as the basis for management.
The POS machine reads the magnetic stripe information on the cardholder's bank card through the card reader, the POS machine operator inputs the transaction amount, and the cardholder inputs the personal identification information (i.e. password). The POS machine sends the information to the issuing bank system through the UnionPay center to complete the online transaction, give the information of success or failure, 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, rapidity and accuracy of transactions, avoids complicated labor such as manual blacklist inquiry and bill pressing, and improves work efficiency.
The design requirements of magnetic stripe card module meet the needs of three-track magnetic cards, that is, the module should be able to read magnetic cards with 1/2, 2/3 and 1/2/3 tracks.
Internal analysis:
Communication interface circuit usually consists of RS232 interface, PINPAD interface, IRDA interface and RS485 interface circuit. RS232 interface is usually the download port of POS program, PINPAD interface is usually the interface between host and password keyboard, and IRDA interface is usually the infrared communication interface between mobile phone and landline. Interface signals are usually composed of sending signals, receiving signals and power signals.
The modem board consists of central processing module, storage module, modem module and telephone line interface. First, the POS will detect the /RING and /PHONE signals to determine whether the voltage on the telephone line can be used. The switch is reset, you can dial, and the sending light flashes to start dialing. The communication protocol determines the handshake confirmation between the switch and the POS, and then the data exchange of the POS will start, and the signal will be sent and received through the modem circuit. Hang up when finished and end the process.