Patent ID: 6560279
Filing Date: 2003-05-06
Classification: G08C,H04L

Abstract:
A data acquisition system comprising:a central unit; a plurality of remote units located at positions remote from said central unit, each of said remote units including a condition response indicator adapted to output a voltage indicative of the condition sensed thereby; means within said central unit for generating a pulse train comprised of a plurality of operating mode pulses and a plurality of address pulses, the number of address pulses being at least equal to the number of remote units with each address pulse being associated with a different one of said remote units; a single pair of wires connecting said central unit to each of said remote units with all of said remote units being connected in parallel with each other; each of said remote units including means for receiving its respective address pulse and including means for modifying the received pulse in accordance with the condition that it has sensed, and means within said central unit for analyzing the pulses as modified by said remote units.