Method of data communication in communication network on automob

Details Method of data communication in communication network on automob Method of data communication in communication network on automob

1991-10-24

1994-09-27

Peng, John K.

Communications: electrical

Continuously variable indicating

With meter reading

34082506, 34082513, 370 851, 455343, H04J 302

Patent

active

053510410

ABSTRACT:
A communication network, such as an audiovisual system, on an automobile has a master unit and a plurality of slave units which are connected to a common communication bus. When the communication network starts operating, connection confirmation request information is transmitted from the slave units to the master unit. The master unit awaits connection confirmation request information from at least one of the slave units for a predetermined period of time after the communication network starts operating. Thereafter, the predetermined period of time is extended if the reception of connection confirmation request information from all the slave units that were connected when the connection network stopped operating in a preceding cycle is not completed. If reception acknowledgement information from the master unit is not detected for a predetermined period of time, then the slave units automatically enter a low power consumption mode.

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