Non-contact ID radio frequency card canteen meal selling system program
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The meal ticket purchase method is slow, easy to make mistakes, and has to spend a lot of manpower and material resources to print and distribute the meal tickets, and the meal tickets carry a large number of germs in the repeated circulation process, which is very unhygienic.
To solve these shortcomings, our company launched a radio frequency card canteen sales management system. The system uses radio frequency cards to replace the meal tickets currently circulating in the canteen. Before going to the canteen to eat, diners pay a certain amount of cash as a pre-buy meal ticket. The canteen management department writes the amount, name, number, etc. into the user card; When you go to the canteen to have a meal, you only need to insert the card into the vending machine at each window, and the staff can input the amount used, and the vending machine will automatically subtract the corresponding amount. When the amount of money in the card reaches the specified minimum line, the window will be displayed on the screen and beep to remind the user to go to the designated place to add the amount in order to resume the use of the card.
ID radio frequency card canteen meal selling system, radio frequency card replaces traditional meal tickets, avoiding the waste of manpower, material and financial resources caused by the circulation of meal coupons, avoiding the forgery and loss of meal coupons, and preventing the outflow of canteen benefits and germs. Disadvantages such as cross-infection have achieved financial daily clearing and monthly settlement. The use and promotion of radio frequency cards have played a huge role in promoting the modernization of logistics.
Introduction to RF Card Technology
Radio frequency card is also called non-contact IC card. It 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 (card The problem of no power supply) and contact-free is a major breakthrough in the field of electronic devices. Due to the incomparable advantages of photoelectric cards, magnetic cards, and contact IC cards, one of them immediately attracted widespread attention and was promoted and applied at an astonishing speed.
The radio frequency card is composed of an IC chip and an inductive antenna, and is completely sealed in a PVC card with no exposed parts. In the reading and writing process of contactless IC cards, the reading and writing operations are usually completed by radio waves between the radio frequency card and the reader.
The radio frequency card itself is a passive body. When the reader reads and writes to the card, the signal sent by the reader is composed of two parts: one is the power signal, which is received by the card, and its own L/C Resonance is generated, and an instantaneous energy is generated to supply the chip to work. The other part is to combine data signals to instruct the chip to complete data, modification, storage, etc., and return it to the reader. The reading and writing system formed by the radio frequency card has greatly simplified the hardware structure and the operation process. At the same time, with the help of advanced management software, the offline operation mode makes the data reading and writing process easier .
Compared with contact IC cards, radio frequency cards have the following advantages:
1. High reliability: There is no mechanical contact between the radio frequency card and the reader, avoiding various failures due to contact reading and writing. For example: failure caused by rough card insertion, non-card foreign object insertion, poor contact caused by dust or oil stains, etc. In addition, there is no exposed chip on the surface of the radio frequency card, so there is no need to worry about chip falling off, electrostatic breakdown, bending damage, etc., which not only facilitates the printing of the card, but also improves the reliability of the card.
2. Easy and fast operation: due to non-contact communication, the reader can operate the card within 10cm, so there is no need to insert or remove the card, which is very convenient for users to use. When the radio frequency card is used, there is no directionality, and the card can be swept across the reader in any direction to complete the operation, which greatly improves the speed of each use.
3. Anti-collision: There is a fast anti-collision mechanism in the radio frequency card, which can prevent data interference between the cards. Therefore, the reader can process multiple radio frequency cards “simultaneously”. This improves the parallelism of the application and virtually increases the speed of the system.
4. It can be suitable for a variety of applications: The storage structure characteristics of the radio frequency card make it multi-purpose with one card and can be applied to different systems. Users can set different passwords and access conditions according to different applications.
5. Good encryption performance: The serial number of the radio frequency card is unique, and the manufacturer has solidified this serial number before the product leaves the factory and cannot be changed. A two-way verification mechanism is adopted between the radio frequency card and the reader, that is, when the reader verifies the legitimacy of the IC card, the IC card also verifies the legitimacy of the reader. The radio frequency card must be mutually authenticated with the reader before processing, and all data is encrypted during the communication process.
RF card system parameters
The radio frequency card conforms to the international standard, the data storage period is 10 years, and the reading is unlimited. The radio frequency card does not have a power supply, has its own antenna, and contains an encrypted control logic circuit and a communication logic circuit. The communication between the card and the reader adopts the internationally accepted DES and RES security cross algorithm, which has extremely high security performance.
working frequency:
Anti-collision: multiple cards can be processed at the same time. Slight reading distance: within 20MM (depending on the shape of the antenna), data can be transferred conveniently and quickly
2 Half-duplex communication method
2 In the process of wireless communication, the following mechanisms are used to ensure data integrity
Support multi-card operation
Anti-collision mechanism: multiple cards can be processed at the same time, and sudden read or write or read-write interruption can be prevented when the card is processed. Dynamic read and write. When a card is processed, other cards can enter or leave the radio frequency The regional rapid anti-collision protocol adds only 1ms to the entire processing process for each additional card
u Material: PVC
u Size: in line with ISO10536 standard
u Working temperature: 20℃ to 50℃ (humidity is 90%)
u No battery: wirelessly transfer data and energy
u Chip processing technology: adopts high-speed CMOSEEPROM process
u Components: a chip and a simple coil. Each security:
u Mutual authentication (ISO/EC DIS97982)
ü All data in the communication process is encrypted to prevent signal interception
ü The serial number of each card is unique in the world
Typical transaction process <100ms
working principle
The electrical part of the card is only composed of an antenna and ASIC, without other external components. Antenna: The antenna of the card is a coil with only a few sets of windings, which is very suitable for packaging in an ISO card. The working principle of the radio frequency card is: the reader sends a fixed frequency electromagnetic wave to the radio frequency card. There is an LC series resonant circuit in the card, whose frequency is the same as the frequency emitted by the reader. Under the excitation of the electromagnetic wave, the LC resonates The circuit resonates, so that there is a charge in the capacitor. At the other end of the capacitor, a unidirectional electronic pump is connected to send the charge in the capacitor to another capacitor for storage. When the accumulated charge reaches 2V, This capacitor can be used as a power supply to provide working voltage for other circuits, transmit data in the card or receive data from the reader.
Confidentiality
The security performance of the radio frequency card is very good: unique card serial number, transmission data encryption.
Radio frequency card charging machine
Technical index
Settlement time <1 second, offline buffering 5000 pens, power consumption <10W, power supply voltage 220V±10%
Communication interface RS-485, reliable communication distance 1200 meters, communication speed 9600BPS
Radio frequency card charging master control system
1. Financial management daily settlement
Database security is impeccable. The financial part of the rice-selling management software belongs to standardized financial software. The SQL2000 special database is adopted, the different encrypted storage of each data, the set check digit and the associated check of the database, completely eliminate the possibility of the financial staff to modify the database.
Project statistics are complete. Statistics on the business situation of the day or meal according to any period of time, and realize the functions of “same day settlement”, “business statistics”, “log retrieval”, “issue monthly supplement” and so on.
Easy to print, clear at a glance. Account opening, withdrawal, card replacement, error correction, monthly replenishment, and other statement vouchers and operating accounts for modifying account content in the management system can be counted immediately and printed quickly.
Transaction error correction, report records, safe and thoughtful. In terms of financial management, the management system software has set up an important error correction function, which solves the problem of only returning cash after the card is pulled out.
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