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Time-division multiplex transmission system

  • US 4,604,618 A
  • Filed: 04/28/1983
  • Issued: 08/05/1986
  • Est. Priority Date: 05/15/1982
  • Status: Expired due to Term
First Claim
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1. A time-division multiplex transmission system comprising:

  • a host machine;

    a signal line connected to said host machine; and

    a plurality of addressable terminals connected to objects to be controlled and objects to be monitored, and connected to said host machine by way of said signal line to place the objects to be controlled under centralized control of said host machine and to place the object to be monitored under centralized monitoring of said host machine, said host machine including;

    transmission means for transmitting, in a cyclic fashion, a transmission signal including address data for addressing said terminals, control data for controlling the objects to be controlled and reply standby signals for defining a reply standby period during which reply signals, including monitor data, may be received from any of said terminals, the reply standby period being divided into a number of reply blocks; and

    first reception means for receiving the reply signals from any of said terminals during the reply standby period and for picking up the monitor data included therein,each of said plurality of terminals including;

    second reception means for receiving the transmission signal transmitted fron said transmission means of said host machine;

    address setting means for setting, as a preset address, an address assigned to the terminal, the same address being set for a number of said terminals which is less than the number of the reply blocks;

    address decision means, connected to said second reception means and said address setting means, for determining if the address defined by the address data in the received transmission signal corresponds to the present address;

    control signal output means, connected to said second reception means and said address decision means, for providing a control signal corresponding to the control data when said address decision means determines that correspondence exists between the addresses;

    reply means for receiving from the objects to be monitored a number of monitor data signals, including monitor data, which is less than the number of reply blocks, and for supplying, for at least one preselected reply block, the reply signal including the monitor data; and

    selection means, connected to said reply means, for selecting the at least one preselected reply block for which the reply signal is to be supplied by said reply means, a different one of the reply blocks being preselected for each of said plurality of terminals having the same preset address, by means of said selection means in each of said terminals, a particular object to be monitored being connected to a particular terminal out of said plurality of terminals having the same address, so that the monitor data in the monitor data signal from the particular object can be determined.

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