Communication control method, communication system and electronic apparatus using the same
First Claim
1. A communication control method in a system for transmitting control signals among a plurality of electronic apparatuses, said communication control method comprising:
- supplying a first command from a first electronic apparatus which is an electronic apparatus on a controlling side, to a second electronic apparatus which is an electronic apparatus on a controlled side;
supplying an interim response from said second electronic apparatus to said first apparatus; and
supplying in response to receiving said interim response, a second command to cancel execution of said first command transmitted prior to said second command by said first electronic apparatus to said second electronic apparatus, said second command requesting said second electronic apparatus that is currently executing but has not finished executing said first command to discontinue said execution of said first command.
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Accused Products
Abstract
To make an inquiry about whether or not a predetermined command is applicable to an electronic apparatus on the controlled side with ease and in a short period of time without letting the electronic apparatus on the controlled side carry out unnecessary processing. A controlling device transmits a notify command to a controlled device. Since the notify command is applicable to the controlled device, execution of the notify command is started thereby. At the beginning of the execution of the notify command, the controlled device sends back an interim response to the controlling device, entering a state waiting for a change which is to be reported by sending back a changed response. When the controlling device receives the interim response from the controlled device, the controlling device can determine that the notify command is applicable to the controlled device, achieving the purpose of sending the notify command. For this reason, when the controlling device receives the interim response from the controlled device, the controlling device immediately transmits a notify (cancel) command to the controlled device, requesting the controlled device to cancel the notify command sent prior to the notify (cancel) command. Receiving the notify (cancel) command, the controlled device discontinues the execution of the notify command.
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Citations
16 Claims
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1. A communication control method in a system for transmitting control signals among a plurality of electronic apparatuses, said communication control method comprising:
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supplying a first command from a first electronic apparatus which is an electronic apparatus on a controlling side, to a second electronic apparatus which is an electronic apparatus on a controlled side; supplying an interim response from said second electronic apparatus to said first apparatus; and supplying in response to receiving said interim response, a second command to cancel execution of said first command transmitted prior to said second command by said first electronic apparatus to said second electronic apparatus, said second command requesting said second electronic apparatus that is currently executing but has not finished executing said first command to discontinue said execution of said first command. - View Dependent Claims (2, 3, 4, 5)
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6. A communication system for transmitting control signals among a plurality of electronic apparatuses comprising:
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a first electronic apparatus which is an electronic apparatus on a controlling side, said first electronic apparatus including a first command transmitting means for transmitting a first command to a second electronic apparatus which is an electronic apparatus on a controlled side, and second command transmitting means for transmitting a second command to said second electronic apparatus, after said first command, to cancel said first command; an interim transmitting means for transmitting an interim response from said second electronic apparatus to said first apparatus to initiate said second command; and said second electronic apparatus including command-execution discontinuing means for discontinuing execution of said first command even though said first command was not completed upon receiving said second command if said first command is applicable to said second electronic apparatus. - View Dependent Claims (7, 8, 9)
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10. An electronic apparatus employed in a communication system for transmitting control signals among a plurality of electronic apparatuses comprising:
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first command transmitting means for transmitting a first command to an electronic apparatus on a controlled side; an interim response receiving means for receiving an interim command from said electronic apparatus on said controlled side; and second command transmitting means for transmitting a second command after said first command and in response to receiving said interim response, to said electronic apparatus on said controlled side to cancel said first command, while said electronic apparatus on said controlled side is executing said first command but has not finished executing said first command. - View Dependent Claims (11, 12, 13, 16)
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- 14. An electronic apparatus employed in a communication system for transmitting control signals among a plurality of electronic apparatuses comprising command-execution discontinuing means for discontinuing execution of a first command after sending an interim response upon receiving a second command after said first command and in response to receiving said interim response, if said first command is applicable to said electronic apparatus.
Specification