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Multiplex transmission apparatus

  • US 5,513,175 A
  • Filed: 04/06/1995
  • Issued: 04/30/1996
  • Est. Priority Date: 04/13/1994
  • Status: Expired due to Fees
First Claim
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1. A multiplex transmission apparatus connected to a second multiplex transmission apparatus by a common transmission line to carry out data communications with the second multiplex transmission apparatus, comprising:

  • power supply means for applying a power supply voltage to individual parts in the multiplex transmission apparatus;

    communication control means for controlling reception of frames which are successively transmitted thereto from the second multiplex transmission apparatus and in which at least part of predetermined data shows a predetermined periodic change, and for outputting the predetermined data in received frames to an output port;

    state setting means for detecting the power supply voltage, and for setting states of the output port and said communication control means individually to an initial state in accordance with a detection result;

    state control means for monitoring at least part of the predetermined data output from the output port, and changing the state of the output port to a predetermined specific state when said at least part of the predetermined data being monitored does not show a predetermined change with respect to corresponding data previously output; and

    inhibiting means for inhibiting said state control means from changing the state of the output port, in accordance with the detection result derived from said state setting means.

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