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System for putting electronic units connected to a communications channel into an operational state or into a stand by state

  • US 4,987,317 A
  • Filed: 01/30/1989
  • Issued: 01/22/1991
  • Est. Priority Date: 02/05/1988
  • Status: Expired due to Term
First Claim
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1. In a system for selectively switching electronic units capable of transmitting or receiving messages in at least a first format by means of a communications channel, into an operational state or into a standby state, characterized in that the system comprises means (B, M) of transmitting a message on the communications channel (A), in a second format which is distinct from the first format, for selectively switching the units (M) into an operational state, each unit (M) comprises:

  • communication interface means (103) operatively connected to the communication channel for transmitting and receiving messages in either the first or second format;

    first interpretation means (102) operatively connected to said communication interface means for interpreting said messages transmitted in said second format in order to at least command the switching on of at least a portion (200, 202;

    300,

         302) of the circuits of the unit in response to the recognition of said message for switching the selected unit into an operational state,second interpretation means (202;

         302) operatively connected to said communication interface means for interpreting the messages transmitted in said first format in order to command at least the switching off of at least a portion (200, 202;

    300,

         302) of the circuits of said unit in response to the recognition of a message for the switching off of this portion of the circuits transmitted in said first format, said second interpretation means being part of the circuits whose switching on is commanded by said first interpretation means, anda power supply circuit (101) for supplying power to said first interpretation means (102) independently from the messages transmitted on the communications channel (A).

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