| 摘要 |
<p>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 said digital data simultaneously to all the other units of the system either by hard wiring thereto, radio link or other transmission medium whereby 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.</p> |
