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Input device interface with power connect state and serial data channel enabling power to the device from time to time

  • US 5,590,339 A
  • Filed: 08/23/1993
  • Issued: 12/31/1996
  • Est. Priority Date: 08/23/1993
  • Status: Expired due to Term
First Claim
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1. An interface between a host and an input device, comprising:

  • a plurality of signal lines for connecting the input device to the host, including a power supply line, a data transmission line, a control signal transmitting line and a control signal receiving line;

    power supply in communication with said power supply line for supplying power over said power supply line to the input device;

    a data transmission channel coupled to said data transmission line for receiving data from the input device and for transferring the received data to the host; and

    control logic coupled to the host and said power supply for enabling the supply of power over said power supply line to the input device from time to time, and monitoring said control signal receiving line to maintain the supply of power until a time out occurs, or until a data transfer on said data transmission channel ends.

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