Integrated security system comprising a plurality of remote-controllable security devices and associated control units

An integrated security system includes a plurality of security devices each issuing an alarm signal. A plurality of control units are associated to control the security devices via a communication line. Each security device comprises an alarm storing section for storing alarm signals received from individual security devices as alarm information. An alarm transmitting section transmits the alarm information to all of the control units via the communication line. The alarm information stored in the alarm storing section during a predetermined storage time are transmitted at a time as an alarm notification command to the control units.