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System for automated selection of a communications unit for refrigerating containers

  • US 5,973,610 A
  • Filed: 08/07/1996
  • Issued: 10/26/1999
  • Est. Priority Date: 11/03/1993
  • Status: Expired due to Fees
First Claim
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1. A system for automated selection of a responsible communications unit from among a plurality of communications units for refrigerating containers, the responsible communications unit acting as an intermediate station between a refrigerating container unit which is to be monitored and a central monitoring station where all refrigerating containers as power consumers and transmitters/receivers are connected to a power supply grid using coded messages;

  • wherein the central monitoring station transmits a query code at regular intervals which causes a response from the refrigerating container units,wherein newly arrived containers are given a network address and a first responsible communications unit, from among said plurality of communications units, which takes over direct communication between the refrigerating container unit and the central monitoring station,wherein errors which are determined in the structure of data or data content causes a predetermined number of attempts by the first responsible communications unit to reestablish communications with the refrigerating container unit andwherein other of said communications units subsequently try to take over the communication with the refrigerating container after said predetermined number of attempts.

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