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Fuel transaction tracking system

  • US 9,340,405 B2
  • Filed: 08/19/2015
  • Issued: 05/17/2016
  • Est. Priority Date: 01/26/2012
  • Status: Active Grant
First Claim
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1. A fuel transaction tracking system at a first location having a fuel transaction data system with a four wire legacy configuration, a four wire remote station at a second location, and two underground communication wires positioned between the first and second location in a current loop comprising:

  • a) an active multiplexing/demultiplexing unit having active power and two data inputs and two data outputs actively connected to the four wires of the fuel transaction data system and a two wire output for connection to an end of the two underground communication wires;

    b) a passive multiplexing/demultiplexing unit having a two wire input for connection to an opposite end of the two underground communication wires and a four wire data output for connection to the four wire remote station comprising a first and second bidirectional current loop connected to the four wire remote station;

    c) wherein the active and passive units are actively connected from the two wire output to the two wire input via the two communication wires; and

    d) wherein the system is capable of multiplexing/demultiplexing four wire data to and from the fuel transaction data system and the four wire remote station via the two underground communication wires set up as a current loop.

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