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Multiplex communication system

  • US 5,305,316 A
  • Filed: 09/03/1991
  • Issued: 04/19/1994
  • Est. Priority Date: 09/04/1990
  • Status: Expired due to Term
First Claim
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1. A multiplex communication system for transmitting and receiving data between a master station and a plurality of slave stations, comprising:

  • (a) master communicating means, disposed in said master station, for controlling data transmission and reception to and from each of said slave stations;

    (b) slave communicating means, including switches disposed in each of said slave stations, for controlling data transmission and reception to and from said master station;

    (c) logic means, disposed in said master station, for accessing said slave stations cyclically one by one in sequence by transmitting a slave station access address an instruction to an accessed slave station and receiving information data from said accessed slave station, to controllably activate loads of said slave stations on the basis of information data concerning said slave stations; and

    (d) discriminating means, disposed in said master station, for collating switch address data transmitted from a slave station with data stored therein to improve transmission reliability, wherein immediately after having received the switch address data transmitted from a slave station, said discriminating means transmits again an access address to the slave station to receive again the switch address data for collation of the switch address data, and said discriminating means discriminates the switch address data as being correct, only when first received switch address data matches in level with second received switch address data.

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