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On the RFID chip, the information is stored in an EEPROM (electrically erasable read/write memory). If the identification medium (e.g. RFID card) enters the transmission range of a reader, a supply voltage is induced via the antenna, which activates the RFID chip.

In the case of encrypted information, the RFID chip on the identification medium checks whether the reader is authorized to read the data and, if so, sends the information to the reader. The reader passes the information on to a higher-level system (e.g. to an access control manager or PC) for further processing. The Access Control Manager checks the access authorization on the basis of the stored room-time profiles and, if positive, activates the door opener.

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Caroline Elsner, Marketing
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