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Data communication method between circuits

  • US 5,467,200 A
  • Filed: 11/04/1993
  • Issued: 11/14/1995
  • Est. Priority Date: 08/17/1989
  • Status: Expired due to Fees
First Claim
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1. A method for performing data communication between a pair of circuits, the data communication being established by serially transmitting information which is composed of pulse signals, wherein the pair of circuits are connected by a single bi-directional communication line, and wherein the data communication is performed in accordance with a duty modulation system using a format including a first predetermined time period, a second predetermined time period and a third predetermined time period, the first predetermined time period being defined as a time period from a time of detection of an instant of first level change of a signal level which is being output to the communication line to a time of detection of the instant of a second level change of the signal level following the instant of the first level change, the second predetermined time period being defined as a time period capable of giving data of "1" or "0" to the bi-directional communication line within the first predetermined time period, the third predetermined time period being defined as a time period for holding a level of the communication line following the second predetermined time period at "0" or "1."

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