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Communication system, communication apparatus, and communication control method

  • US 7,065,391 B2
  • Filed: 07/18/2003
  • Issued: 06/20/2006
  • Est. Priority Date: 07/18/2002
  • Status: Active Grant
First Claim
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1. A communication system comprising:

  • a master and a slave that can communicate with each other, said master including a first communication section for transmitting a start request signal to said slave, said slave including a second communication section for receiving the start request signal transmitted by said master,wherein said slave can take any ofa start state in which said slave can communicate with said master,a communication control state in which at least said slave can receive the start request signal transmitted by said master and makes a transition to the start state upon reception of the start request signal, ora standby state in which power is less consumed than in the start state or the communication control state,wherein said slave further comprises a state control section for repeatedly operating so that said slave in the standby state is switched, independently of any signal from the master, to the communication control state at a predetermined timing and is switched to the standby state when the communication control state continues for a predetermined time period without receiving the start request signal, andwherein said slave further comprises a sensor communicating section which produces a communication state request so that the slave in the standby state is switched to the communication control state.

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