Remote sensing systems
First Claim
1. A remote sensing system, in which a first group of remote units are associated with a master station for transmitting information to that master station and are for installation within reception range of one or more other master stations each having associated therewith a respective further group of remote units, each remote unit of each such further group transmitting information to its respective master station, the information transmitted by the remote units of each said further group being identified witha respective access code which is recognizable only by the master station associated with those remote units, the system includingmonitoring means connected to the first master station and operative to cause the access code applicable to each of the said further groups to be monitored by radio, andselecting means connected to the monitoring means and responsive to the monitored access codes for selecting a different value of access code for the first master station.
1 Assignment
0 Petitions
Accused Products
Abstract
A security installation at one Site has remote sensors which detect intrusion, fire, etc. and transmit corresponding signals by radio to a master station. Similar installations are provided at other Sites. The sensors of each Site precede their data signals with an access code which is particular to that Site and prevents their signals being received by the master station of any adjacent Site within radio range. When a new installation is to be installed at a new, adjacent Site, an arbitrary value is initially selected for its access code and the master station there transmits a special code to all adjacent Sites. In response to this special code, the master station in each such adjacent Site transmits its own access code back to the new installation, where it is compared in value with the arbitrarily selected access code. The latter is automatically changed until it becomes different from that of any and all adjacent Sites. The remote sensors of the new installation are then set to this value.
72 Citations
17 Claims
-
1. A remote sensing system, in which a first group of remote units are associated with a master station for transmitting information to that master station and are for installation within reception range of one or more other master stations each having associated therewith a respective further group of remote units, each remote unit of each such further group transmitting information to its respective master station, the information transmitted by the remote units of each said further group being identified with
a respective access code which is recognizable only by the master station associated with those remote units, the system including monitoring means connected to the first master station and operative to cause the access code applicable to each of the said further groups to be monitored by radio, and selecting means connected to the monitoring means and responsive to the monitored access codes for selecting a different value of access code for the first master station.
-
8. A method of preventing interference between adjacent installations each comprising a respective group of remote stations which transmit information to a respective master station by means of signals which are identified by an access code, comprising the steps of
causing the access codes of all installations within reception range of the location of a proposed new installation to be automatically monitored, and sensing the monitored access codes and responding thereto by automatically selecting for the proposed new installation a value of access code which is different from the monitored access codes.
Specification