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Device for the sequential transmission of signals by radio or by cable, between a central control system and data acquisition apparatuses

  • US 4,583,206 A
  • Filed: 08/24/1982
  • Issued: 04/15/1986
  • Est. Priority Date: 08/24/1981
  • Status: Expired due to Term
First Claim
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1. A device for successively effecting the sequential transmission of signals selectively by radio and selectively by cable between a central control and data recording system and a plurality of data acquisition apparatuses placed at different locations, the transmission system comprising:

  • radio transmission and reception means in said central control and recording system, and in said data acquisition apparatuses;

    at least one transmission cable for connecting the control and recording system and the data acquisition apparatuses which system and apparatuses are provided with detachable connectors for the transmission cable, means for neutralizng the radio transmission and reception means in each of said acquisition apparatus when the connection of the latter by cable is established, said neutralizing means comprising a first switch controlled by a relay receiving its control electric voltage through a conducting connection created by assembling of said connectors, actuation of said relay interrupting the electric supply of said radio transmission and reception means associated to said acquisition apparatus;

    wherein the control and recording system comprises a generator of modulated control signals and connection means for transmitting the control signals to radio transmission means associated with the control and recording system and with the transmission calbe when the latter is connected, said cable interconnecting in series a plurality of resistors, each acquisition apparatus including a demodulator for sensing the electric voltage across each of said resistors.

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