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Field sensor communication system

  • US 5,469,156 A
  • Filed: 05/01/1992
  • Issued: 11/21/1995
  • Est. Priority Date: 07/04/1989
  • Status: Expired due to Fees
First Claim
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1. A field sensor communication system in which a signal is transmitted/received between at least a field sensor and at least an upper level unit, which is one of an upper level receiving unit and an upper level communication device, via a signal transmission line, at least one of said field sensor and said upper level unit of said field sensor communication system, comprising:

  • means for determining whether there is any communication error in a received digital transmission signal by comparing the transmitted signal with the received signal; and

    means for changing the amplitude level of said digital transmission signal in accordance with an output of said determining means.

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