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Abstract
This paper introduces the design and development of network access control system of
intelligent IC card, a detailed analysis of the hardware design and software design of the
system, the flow chart and program are making contactless smart card reading device of the
circuit schematic and printed circuit board PCB drawings, as well as the main program
design. Card reader mainly by the radio frequency antenna, card reader module, RS485
munication interface and MCU control system, can read and write Philips Mifare pany's
contactless smart RF card, card reader distance of about 10cm. When there is no card into
the card reader in the energy range, the system will display the clock, when the card entered
read data in the card and the card number to display on the digital display. Through RS485
interface and PC, constituting the munication network, card reader usually can work
independently, PC every opportunity to a certain time access card reader, with unified clock
calibration for PC card device on the clock, and read the memory card data, in order to read
the data card to be timely processing. After repeated testing, the system runs normally, and
is stable and reliable. Card reader using internal integration with 8K bytes of Flash program
memory AT89C52 microcontroller as the controller, with the expansion of the standby battery
with a real-time clock, data memory, 8 LED display and display driver. In addition, the state
indicating lamp and the buzzer are extended to be used for indicating the status of the card,
the success indication of the school and the successful indication of the data transfer. Serial
interface chip is adopted in the system, which has few pins and simple connection, which is
advantageous to reduce the volume of the card reader and reduce the power consumption. In
addition to use the card reader to do the management of access control, but also can be
extended to other uses, to achieve a multi-purpose card.
【Key words】Access control system Card reader Microcontroller
Serial interface
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