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COMMUNICATION SYSTEM WITH PORTABLE UNITS CONNECTED THROUGH A COMMUNICATION CHANNEL TO A COMPUTER FOR APPLYING INFORMATION THERETO

  • US 3,819,862 A
  • Filed: 01/10/1972
  • Issued: 06/25/1974
  • Est. Priority Date: 01/10/1972
  • Status: Expired due to Term
First Claim
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1. Apparatus for providing communication between a plurality of points and a central station, and wherein a communication channel extends from the points to the central station, such apparatus including in combination, a plurality of portable units each including switch means, connector means, and transmitter circuit means connected to said switch means and to said connector means, said transmitter circuit means including means producing a binary signal representing the operation of said switch means of said portable unit, and code means connected to said transmitter circuit means and cooperating therewith to produce a binary signal representing the particular portable unit, a plurality of receptacles at said points and each having terminal means adapted to be connected to the communication channel, connector means for mating with said connector means of said portable unit and circuit means connected to said connector means and to said terminal means, wherein said circuit means includes code means connected to said transmitter circuit means through said connector means to provide a further binary signal for identifying the particular receptacle, each of said portable units cooperating with one of said receptacles upon interengagement of said connector means thereof to apply to said terminal means a binary signal from said transmitter circuit means, and receiver circuit means included in each of the said portable units, for receiving signals from the central station, operatively connected to cause each of said portable units to apply to said terminal means a binary signal from the said transmitter circuit means, in response to a signal from the central station.

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