Centralized management system for entrance guard telephones

A centralized management system for the entrance guard telephones is especially suitable for telephone-type entrance guard or intelligent entrance guard, and is composed of managing host, main controller, intelligent controller for entrance guard, electronic lock, unlocking device, printer and cipher R/W device. The telephone network or prevate line is used for connection between main controller and intelligent controller for entrance guard. The dual-tone code DTMF mode is used for communication between them. The intelligent controller can perform the monitor of entrance guard state and the unlocking functions. The managing host and main controller are connected via enterprise network and constitute a global management network.