Building security system

Details Building security system Building security system

1988-02-09

1990-06-26

George, Keith

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379 51, H04M 1104, H04Q 358

Patent

active

049378554

ABSTRACT:
A building security system for coupling to a building telephone line which includes a building subscriber telephone line connected to a subscriber telephone set on one end and to a central office line at the other end. The central office line leads to a central office exchange. The building security system controls communication between a central office exchange caller, a subscriber and a visitor at an intercom station in order to allow subscriber control of visitor entry and for allowing entry without subscriber control to authorized personnel. The system includes a micro-controller, a non-volatile memory coupled to micro-controller which is programmable for storing system parameters including security entry codes and a building door latch of an entrance door which is coupled to the micro-controller. The latch is operative in response to a control signal from the micro-controller to unlock the associated entrance door. A line relay is coupled to micro-controller for breaking direct connection of the central offices subscriber line and inserting in series with each of the latter a security system line which operates in response to a control signal from the micro-controller. A visitor intercom station is coupled to the micro-controller and is connectable to the subscriber telephone set through the system line in response to a control signal from the micro controller. The intercom station has a key pad for manually entering data and response to which the micro-controller accesses the subscriber telephone set or operates the door latch if the data entered corresponds to a security entry code number stored in the non-volatile memory.

REFERENCES:
patent: 3484561 (1969-12-01), Matthews
patent: 3917911 (1975-11-01), Lesher
patent: 3947641 (1976-03-01), Trell
patent: 3990075 (1976-11-01), Schmitz et al.
patent: 4644104 (1987-02-01), Middlemiss
patent: 4748654 (1988-05-01), Gray
patent: 4764953 (1988-08-01), Chern et al.
patent: 4766548 (1988-08-01), Cedrone et al.
GTE Automatic Electric Journal, "New Electronic Enterphone System", Jan. 1979, pp. 6-13.
Trell V. Marlee Electronics Corp., 5USPQ2d, pp. 1501-1510 10/19/1987.
GTE Enterphone Brochure entitled "DOOR-Entry, Etc."
GTE Brochure entitled Enterphone, An Electronic Apartment control.
Viscount Brochure entitled Enterphone.

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