Alarm signals are processed in a security system in which an on-site detector is connected by a communications link to a central station. A time delay circuit is connected at the site being protected, to the detector, with the time delay means being turned on and off by a time clock. The time delay period permits the alarm system to be activated and deactivated by predetermined procedures to prevent the central station from receiving unnecessary alarm signals.
CROSS REFERENCES TO RELATED APPLICATIONS
This application is a continuation-in-part of copending application Ser. No. 304,143 filed Nov. 6, 1972, which was a continuation-in-part of copending application Ser. No. 126,590, filed Mar. 22, 1971.
An electronic security system has a plurality of remote sending units which transmit coded intrusion and other emergency signals to a central alarm station. The alarm station decodes the received signals and produces an appropriate warning from an alarm generator. Electronic alarm controls at the central station discriminate the intrusion signals from other emergency signals and may block or delay the intrusion signals to allow entry or exit from the protected area. Testing circuits are also included in the alarm controls to establish a test mode of operation in which sending units transmit intrusion signals, and receipt is indicated without actuating the alarm generator. During the test mode of operation, the alarm control still accepts priority alarm signals from other sending units and generates alarm warnings from the alarm generator. The alarm control also provides alarm warnings from priority alarm signals after disarming signals are received to permit authorized entry, and provides vehicle intrusion warnings unless cancelled by a second coded transmission.
An alarm system comprising a sensor which detects a human body in a fixed detection area and outputs signals, a delay timer circuit which outputs signals after passing a fixed delay time by turning on an alarm switch, a two input AND circuit in which output signals of the delay timer circuit and the sensor are entered, a latch circuit with a delay timer which outputs signals after passing a fixed delay time from when output signals of the two input AND circuit are entered and keeps the signals being outputed until entry of reset signals.
A security system in which fire or intrusion signals may be impressed on a first and a second monostable oscillator connected in timing circuits, the first monostable oscillator producing an output for a first limited time period to excite an alarm, and coincidently in time a second monostable oscillator producing an output of shorter second time period for delaying actuation of the alarm to permit the operator to deactivate the unit prior to actuation of the alarm, each of the monostable oscillators using an integrated circuit and being reset by application of power to the unit and during function key switch position change. The fire channel has top priority over any other functional characteristics of the master control.
