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Polling communication system with priority control

  • US 5,132,680 A
  • Filed: 12/07/1989
  • Issued: 07/21/1992
  • Est. Priority Date: 12/09/1988
  • Status: Expired due to Term
First Claim
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1. A communication system, comprising:

  • a master station,a plurality of slave stations each for communicating corresponding data with said master station; and

    a two-way transmission line connecting said master station and said plurality of slave stations;

    each of said slave stations includes at leastrequest sending means for sending a request for further communication with said master station appended to the corresponding data sent to said master station when said slave station corresponding thereto receives an allowance signal from said master station and said slave station corresponding thereto has the request for further communication;

    transmitting means for sending the corresponding data upon reception of the allowance signal;

    said master station includes at least;

    request detecting means for detecting the request for further communication with said master station which is appended to the corresponding data sent from one of said slave stations;

    request memorizing means for memorizing one of said slave stations from which the request for further communication with said master station is detected, until the allowance signal is sent from said master station to the one of said slave stations corresponding to the memorizing of the one of said slave stations;

    cyclic address pointing means for pointing out an address of a next one of said plurality of slave stations in a cyclic order when no slave station is memorized in said request memorizing means; and

    select control means for outputting the allowance signal to communicate with said master station either to one of said slave stations read out from said request memorizing means when at least one of said slave stations are memorized in said request memorizing means, or to one of said slave stations the address of which is pointed out by said cyclic address pointing means when no slave station is memorized in said request memorizing means.

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