Fence alarm system with swiveling posts

摘要

A wire fence alarm system 10 comprises a plurality of zones in which a wire or set of wires is stretched between two anchor posts. A sensing post includes sensors for detecting deflection of one of the wires and a processor for generating alarms responsive to signals from the sensors. One or more of the anchor posts comprise rotating members attached to the wires. Use of the anchor post to climb the fence will result in an imbalance in the forces applied to the rotating members by the wires, thereby initiating an alarm condition.