Consumption has become an indispensable part of people's daily life. People make money mainly for consumption, and exchange for the goods they need and their families. Often, in the efforts of the business, the consumption of many goods will often become fashionable. It can be seen how widespread and important consumption is. This requires that the process of consumption must be more convenient and efficient, because with the development of society, people's life rhythm is getting faster and faster, competition is getting stronger and stronger, consumers' demands are getting higher and higher, otherwise, in the buyer's market. If the situation does not meet the needs of consumers, it will be eliminated.
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In this form, smart cards are widely used and quickly promoted. Among them, the use of RF cards is more ubiquitous, such as credit cards, cash cards, electronic wallets, savings cards, loan certificates, as well as electricity meters, water meters, gas meters, door locks, access cards, canteen meals, attendance. Card, employee card, entertainment consumer card, shopping mall card, discount card, telephone r-, highway traffic charge K-, parking charge card, subway, bus ticket card, fuel card, ID card, temporary residence permit, other for identification card. The reason why the RF card plays such a large role is that it has the following advantages:
1) It is a PVC card with storage function and encryption function, which cannot be deciphered at present.
2) The RF card is not afraid of water, is not afraid of magnetism, has no loss, and has a very long life.
3) One card per person can be sensed by putting it in a wallet or work permit, which is convenient for hygiene and oil-free.
4) If the card is lost, it can be reported in time without any direct economic loss.
5) It can be used for networking or offline operation, and remote control can be realized by telephone line MODEN.
6) One-card multi-purpose can be realized through partitioning, and the extended function is strong, which is used for consumption, attendance, access control and other cards.
1 RF card and its interface device
A radio frequency card (RF card for short) is an integrated circuit card that transmits data wirelessly, and has unique advantages such as data processing and security authentication functions. RF card and its detailed RF card, also known as contactless IC card, was born in the early 1990s. It is a new technology developed in the world in recent years. It successfully combines radio frequency identification technology and IC card technology to solve The problem of passive (no power in the card) and contact-free is a major breakthrough in the field of electronic devices. Due to the incomparable advantages of magnetic cards and contact IC cards, one of them has attracted widespread attention and has been popularized and applied at an alarming rate.
A wireless smart card (also known as a radio frequency card) is a passive (power-free) built-in special key digital password card. It uses a two-way radio frequency technology RF card development board model to complete the digital identification of the card, which means Cardholder identity and related information. Because of its many advantages, this new technology is gradually replacing optoelectronic cards, magnetic cards, and IC cards. It is the mainstream direction for the development of smart IC cards in the future. It is widely used in the fields of identity authentication, credit authentication, automatic control, security and other fields. Its security, confidentiality and practicability are unmatched by various general protection circuits.
The reader generates a radio frequency signal that has been modulated by data, the frequency of which is f = 13.56 MHz, and the resonant frequency of the LC series oscillator circuit in the RF is the same as the frequency of the RF signal emitted by the reader, so that the RF is Under the excitation of the signal, the LC oscillating circuit generates resonance, so that the capacitor has a charge. At the other end of the capacitor, there is a unidirectional electronic pump that sends the charge of the capacitor to another capacitor for storage. When the charge reaches 2 V, this capacitor can be used as a power supply to supply operating voltages for other circuits such as Peng PROM, while demodulating the data signal or the data in the RF card is transmitted and sent to the reader. The data is in r and read and write. The two-way transmission between the devices is half-duplex.
2 POS machines in consumer places
POS (Pointofsales) Chinese means "sales point", the full name of the point of sale information management system, is a bar code or OCR code (Optical character recognit light character code) terminal reader, cash or barter cashier function. There are two types of cable and wireless, wireless and wireless. The POS machine is linked to the settlement system of the advertising barter transaction platform. Its main task is to provide data service and management functions for commodity and media transactions, and to perform non-cash settlement. The basic business intelligence in large-scale transactions is difficult to obtain, and the introduction of POS system is mainly to solve the blind spot of information management in retail industry. An important part of the chain store management information system.
The basic principle of the POS system is to first create the product data in the computer file. Through the online structure of the computer cash register, the bar code on the product can be directly read through the optical reading device on the cash register device (or directly input the code by the keyboard). Product information (unit price, department, discount...) can be displayed to speed up the cash register speed and correctness. The detailed sales information (sale price, department, time slot, customer floor) of each product is automatically recorded and then transmitted back to the computer by the rack. Through computer computing, it can generate various sales statistical analysis information as the basis for business management.
POS window C machine design uses 8051 single-chip technology, which not only integrates the reader, but also completes the read/write control function of the RF card. It also realizes five functions of data acquisition, data processing, data result display and keyboard operation. The control program in EzPROM realizes the read/write control of the reader by 1/O day. At the same time, the relevant information in the RF card is read into the extended RAM, and then transmitted to the server through the 8051 serial port to realize reading and writing. Control and data collection. The data is displayed through the digital tube, and the keyboard operation is realized through the keyboard. The connection here is connected to the 25-pin interface of the network controller. The interface causes the POS to complete the collected flow data through RS485 and upload it to the network controller.
3 network controller
A network controller, also known as a network card or NIC (Network Interface Controller), is a piece of computer hardware designed to allow a computer to communicate over a computer network. Because it has a MAC address, it belongs to the second layer of the OSI model. It allows users to connect to each other via cable or wireless. Each NIC has a unique 48-bit serial number called a MAC address that is written in a ROM on the card. Every computer on the network must have a unique MAC address. No two NICs produced have the same address. This is because the Institute of Electrical and Electronics Engineers (IEEE) is responsible for assigning unique MAC addresses to network interface controller vendors.
Network controllers are divided into built-in and external. Whether it is a built-in or external network controller, only one computer can be equipped. The network controller is based on the 89C52 single-chip microcomputer, and uses RAM as the memory to protect the data processing and transmission by the firmware control in the PROM. It has two interfaces, one is the COM port, connected to the COM port of the computer to complete the data recovery to the computer; the other is the 25-pin connection "1, connected to the POS terminal, and the flow of water is uploaded to the network controller and file at regular intervals. Is sent to the network controller.
4 Microcomputer management
Although RF cards, POS machines, and network controllers all have storage and control functions, their capacity and control capabilities are limited. In order to achieve powerful consumer management functions, computer management must be provided. The life and soul of computers lies in software management. Therefore, in order to realize the good application of RF cards in the consumer field, we have developed a smart consumption management system. The operating environment of this system is Windows98 operating system, the development tool is Microsoft Visual Basic 6.0 Chinese version software, the database uses Microsoft Access intelligent consumption management system structure as shown in Figure 1.
Figure 1 Intelligent consumption management system structure
The system adopts object-oriented programming technology, uses VB's form FORM to complete the design of various user interfaces, and uses VB module MODEL to realize various function functions. Write different code programs for different processes of different objects to implement different functions. For example, the Timer procedure of the 'I'imrun object of the Timer class control calls the function BS_LA of the POSTEK.DLL dynamic link library to collect water data. Similarly, the Timer procedure of the TimNetrun object of the Timer class control calls POSTEK.DLI, and the function BS-FD of the dynamic link library sends the file in real time, which completes the real-time transmission communication function of the data. For example, through the different menu items of the FORMA Work N window menu of the main interface, the data processing functions of opening an account, canceling an account, adding money, subsidizing, withdrawing money, refunding, reporting, reporting, statistics, and summary are completed.
5 system security
The RF card not only has a storage function, but also has an encryption function. Even if it is lost, it can be lost. If it is a readable and writable RF card, the RF card has detailed information about the consumer. Even if the data in the host database is lost, the data can be finally recovered.
The POS machine has off-line operation. When the network communication between the network controller and each POS machine fails, the POS machine can run off-network independently, and all the data in the collected RF card is stored in the RAM of the POS machine to retain the complete original flow data. After the fault is cleared, the network controller communicates with the network controller again, and the data is sent back to the network controller for reservation. After the fault is recovered, the network controller transmits the data to the master computer.
The computer can set the user password, and different users who use the smart consumer management system software also have to grant different permissions. The database used for the connection can be set to a password, different users and different groups can be granted different permissions to use the object, and so on.
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