| 摘要 |
PURPOSE: A common door interphone system with a remote sensing smart card is provided to automatically open the door when an access smart card approaches within a predetermined distance. CONSTITUTION: A smart card control unit(210) comprises a data transceiver(211), a storage(213), a comparison unit(214), and a smart card controller(212). The smart card controller controls the storage and the comparison unit. The smart card controller outputs a control signal by the comparison result. A data transceiver(230) receives a data. The data transceiver transmits and receives the data through a communication port of the entrance control phone. |
