first, the wireless smart card
this article describes the wireless smart card encryption are passive read-only memory, the chip except the serial eprom with 64bits encryption, but also with a modulation code generator output ports with the external rf circuits together to form a wireless connection to send the data type . its biggest feature is the battery-powered systems rely on radio waves to provide the necessary energy.
wireless smart card (also known as radio frequency card) is a passive (free supply) containing the special key digital key card, which uses two-way radio frequency technology, complete digital identification card, which represents the identity of the cardholder and related information. this new technology has many advantages because, being gradually replaced by optical cards, magnetic cards, contactless ic cards, smart ic card is the future direction of the mainstream of development. it is widely used in identification, credit identification, automation control, area security, the security, confidentiality, availability of general prevention circuit is unmatched.
the internal structure of the wireless smart card, the chip at the factory prior to curing particular group is a group of key digital password information. identification system in the host system's user login and become a card, the card will be under the rules set by the host system, for identification and transactions.
wireless smart card chip size of only 4mm × 8mm × 1mm, therefore, can be made according to user needs the card stored in the wallet cards, hanging out in the staff of the chest card, key chain together the key card in the card can even be made accessories, gift cards, ultra-miniature hidden card. reader with wireless modules and master reader or a computer network system with, you can set up high-performance, intelligent identity management identification system.
second, the wireless reader module
wireless smart card reader identification with the host system to complete the exchange of information, must rely on radio waves as a means of transport, obviously radio transmitter and receiver circuits in this system plays a pivotal role. the modular wireless reader circuit, difficult to debug production of solid-state high-frequency transceiver circuit, making the smart card and reader identification system made greatly simplified. module curing a two-way wireless transmission of data needed to send / receive circuit, the final out pin from the module's serial data output signal. the signal can be sent to identify the control circuit or monolithic special management unit, for a variety of pre-function control. wireless reader module based on operating voltage, radiation range, output interface requirements, design a variety of models, the schedule set out by the chinese electronics factory in zhongshan city, the production of some module parameters for the reference.
third, the application examples
a series of digital wireless reader how to use the output circuit, which need to rely on the control circuit or computer to complete, for example, smart card management for cafeteria food tickets, when the computer reads the smart card password, instantly recalled the memory of the meal card information, that balances the amount, type the amount of the second meal ticket, the original deposit amount the cardholder record will be reduced. typically, different types of control ic, can create different functions of the control circuit, figure 3 is the application of rf601 manifold for residential gated anti-theft system. the figure, k1 for the switch, with the owner of the system, the switch can be prepared by a "permit" command card and a "dismissal" command card, the use of these two cards, the first time the owner can use the "allow" card command hundreds of legitimate machine memory cards, and ready for use "dismissal" card, the command of a particular dismiss unpopular, it is unlawful for the future of a particular card or attract new legitimate card. k2 is the lock time is set to coincide with the different functions of the electric lock.
smart card application is very extensive, time and attendance systems, parking access charge management, community prevention systems, and even books in the family as a pipe, power control, the insurance box, automatic doors.