The basic operations in the admittance control systems are identifications. They are divided according to identifying instruments on the PIN code, magnet storage media, finger print, voice, etc. and ...by procedures themselves divided into the contact and contactless ones. Since the contactless memory medium has many advantages, the contactless smart cards are used in the admittance control system which is described in this paper. Besides taking track of the working time, the computerized admittance control system also offers absolute control over accesses into certain areas (rooms). It enables the data acqusition about the time of arrival-departure, view over the circulation of people between various areas and monitored access into every area that is included in the system. Over the data, which are saved in the monitoring computer, different statistic analyzes are possible, for example space occupation, utilization of equipment, presence of employees, etc. The computerized admittance control system is globally composed of monitoring computer, interface between RS232 and CAN bus, CAN bus and microcontroller interface, which manages a contactless card reader, controls electric key-lock and other light and acoustic signals. By oneans of a succesful resumption of communication between CAN and RS232 bus accepts these data, redesigns them in order to transfer them over RS232 to the monitoring computer. As the monitoring computer accepts the data package, it can differentiate between a demand for an access into the area, communication checking or some other package (alarm for example). In case of demanding an access to enter, an information is shown from the data package as to who and which door are to be entered. The monitoring computer checks over the data base if the user has a permission to enter a certain door at that certain time or not. In both cases, it sends the data package as an answer to the microcontroller interface where it is written how to operate with light and acoustic signals and of course electric key-lock.
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