Communication control method, communication system and electroni

Details Communication control method, communication system and electroni Communication control method, communication system and electroni

1997-05-29

2000-11-21

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

34082537, 34082506, 34082507, 34082552, 34082569, G08B 522

Patent

active

061509531

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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