Communication system, communication apparatus, and communication control method
First Claim
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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Accused Products
Abstract
A slave can take any of a start state in which the slave can communicate with a master, a communication control state in which at least the slave can receive a start request signal transmitted by the master and makes a transition to the start state upon reception of the start request signal, or a standby state in which power is less consumed than in the start state or the communication control state. The slave further includes a state control section for repeatedly operating so that the slave in the standby state is switched 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.
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Citations
20 Claims
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1. A communication system comprising:
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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 of a 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, or a 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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A communication apparatus as a slave that can communicate with a master, comprising:
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a communication section, when the master transmits a start request signal to said communication apparatus, for receiving the start request signal, wherein said communication apparatus can take any of a start state in which said communication apparatus can communicate with the master, a communication control state in which at least said communication apparatus can receive the start request signal transmitted by the master and makes a transition to the start state upon reception of the start request signal, or a standby state in which power is less consumed than in the start state or the communication control state, wherein said communication apparatus further comprises a state control section for repeatedly operating so that, independently of any signal from the master, said communication apparatus in the standby state is switched 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, and wherein 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. - View Dependent Claims (15, 16, 17)
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18. A communication control method in a slave that can communicate with a master, the method comprising:
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inducing a start state in the slave in which the slave can communicate with the master; inducing a communication control state in the slave in which at least the slave can receive a start request signal transmitted by the master and makes a transition to the start state upon reception of the start request signal; inducing a standby state in the slave wherein less power is consumed than in the start state or the communication control state; independently of any signal from the master, performing repeatedly an operation of switching from the standby state to the communication control state at a predetermined timing and switching to the standby state when the communication control state continues for a predetermined time period without receiving the start request signal, and using a sensor communicating section to produce a communication state request so that the slave in the standby state is switched to the communication control state. - View Dependent Claims (19, 20)
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Specification