Patent ID: 7734906

Claim:
An alarm security system for monitoring a plurality of premises, comprising a plurality of security subsystems, each of said security subsystems being discretely located, and a system communications bus interconnected to each of said security subsystems to enable bi-directional communication directly between any two of said security subsystems, wherein each of said security subsystems comprises: a) a local communications bus, b) a plurality of user interface devices connected to said local communications bus, each of said user interface devices comprising input devices that allow a user to input commands for controlling operation of a security subsystem, c) a plurality of sensor devices connected to said local communications bus, each of said sensor devices adapted to monitor an area under surveillance and sense if an intruder has entered said area under surveillance and generate an intrusion signal accordingly, d) a panel linking gateway connected to said local communications bus and to the system communication bus, said panel linking gateway adapted to selectively transfer data between said local communications bus and said system communication bus; and e) a control panel connected to said local communications bus comprising: processing circuitry adapted to receive intrusion signals from said sensor devices and determine if an alarm message should be generated; a memory indicating, for each of said plurality of user interface devices, if a user interface device is associated with said security subsystem or is linked to a different security subsystem; wherein user interface devices that are associated with said security subsystem interact only with said security subsystem, and wherein user interface devices that are linked to a different security subsystem interact only with said different security subsystem via said panel linking gateway and said system communication bus; and wherein said processing circuitry is further adapted to link a user interface device associated with said security subsystem to a different security subsystem on request of a user.