Communicating on and monitoring of electric fence wiring systems using a pulse density modulated signal

摘要

Signals are sent along an electric fence wire by pulse density modulation. The signals may be used for communication between a master unit and slave units for monitoring the condition of the fence. The transmissions from different slave units are timed to occur at different times or timeslots between successive pulses from the energiser. The slave units are powered from the electric fence pulses. The slave units monitor the and sum up the peak voltages of energy pulses until a threshold value is reached at which point a response signal is sent to the master unit. The master unit determines how many times each slave unit has responded within a known number of fence pulses, and can then determine the peak voltage on the fence at each slave unit to enable the condition of the fence to be determined.