SECURITY SYSTEMS

摘要

In a security system consisting of a detection unit or transmitter (151) and an alert unit or receiver (152), the detection unit (151) is provided with microprocessor control responsive in an active mode of the unit (151) to an alarm condition in the vicinity of the unit (151) to communicate an alarm signal to the alert unit (152). Input means such as a panic button (176) on unit (151), an integral infrared detector (175), or an external connection, serve to communicate the alarm condition to the microprocessor of unit (151). A radio transmitter within unit (151) transmits the alarm signal to the alert unit (152). Within the unit (152), a radio receiver detects the alarm signal from the transmitter (151). A microprocessor controller of the alert unit (152) is responsive in an active mode of unit (152) to the alarm signal to report the alarm condition in the vicinity of the detection unit (151). Receiver (152) has a buzzer and indicator lights or other display arrangements to provide an aural and visual indication of the report of the alarm condition. The alert unit (152) has a self-contained power supply in the form of a battery. The detection unit (151) is powered from a mains supply with battery back-up. In this manner, the detection unit (151) and the alert unit (152) together define an associated and portable security system, each of units (151 and 152) being independently portable. In use of the system, detection unit (151) is located within a region to be monitored and the wireless-linked alert unit (152) is held by a neighbour. The portability of the system enables interchange of roles between the premises monitored and the person carrying out the monitoring. The system is particularly directed to protecting domestic homes and to caring alarm situations in a neighbourhood context.