초록 ▼

A transceiver unit for an electronic surveillance system is internally coded with an address-number for identification within the system and is adapted to receive input from sensors detecting alarm conditions. The unit is switchable from an idle condition wherein it transmits digital data relevant t

A transceiver unit for an electronic surveillance system is internally coded with an address-number for identification within the system and is adapted to receive input from sensors detecting alarm conditions. The unit is switchable from an idle condition wherein it transmits digital data relevant to its address-number and status but does not recognize input from a sensor, to a primed condition wherein it transmits digital data relevant to its address-number and status information indicating an alarm condition. The unit is able to receive digital data from other similar units sequentially and display information relevant to the identity and status thereof. In a security system a plurality of such units communicate with each other and in turn transmit the digital data to all the other units of the system simultaneously, either by hard wiring thereto, radio link or other transmission medium. An alarm condition detected by one unit is recognized at all other units of the system. Remote switching of a unit from idle to primed by any of the other units is disclosed.

대표청구항 ▼

An electronic surveillance system comprising a plurality of transceiver units at spaced locations within the system, characterized in that each of said transceiver units comprises means for establishing a cycle of operation, for transmitting digital data in turn, to all other units of the system at

An electronic surveillance system comprising a plurality of transceiver units at spaced locations within the system, characterized in that each of said transceiver units comprises means for establishing a cycle of operation, for transmitting digital data in turn, to all other units of the system at an exclusive time slot in said cycle of operation, said data identifying the particular unit transmitting data and providing status information, means for recognizing, at all times, a said transmission from any other unit of the system and also identifying a transmission from the immediately preceding unit in said cycle, and performing a said transmission next in turn thereafter, the unit last in said cycle including means for transmitting coded information such that the first unit in said cycle can identify the end of a cycle and recommence, and each said unit comprises means for responding to the failure of any one unit of the system to transmit said data in turn, and for responding to receipt of said status information.