H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/23
H04J 3/02 (2006.01) G08C 25/00 (2006.01) H04Q 9/14 (2006.01) B60R 16/02 (2006.01)
Patent
CA 1210169
- 35 - Abstract Vehicle Multiplex System Having Protocol/Format For Secure Communication Transactions An improved serial data protocol/format is provided in a serial multiplex system for use in an automotive vehicle electrical system which is subject to electrical noise. The protocol/format includes successive transactions between a master controller and respective remote controllers each connected to a serial multiplex bus. Each transaction is bidirec- tional and includes a command message transmitted by the master controller and a reply message normally transmitted by an answering remote controller. Each command message is preceded by a multibit SYNC byte. The command message includes an address byte (for a particular remote controller), a command byte, and an error check such as a cyclic redundance check byte passed on the address and command bytes. The reply message includes the address byte of the replying remote controller, a response byte indicative of its response to the command byte, and an error check such as a cyclic redundancy check byte based on the reply address and response bytes. The master controller may be caused to repeat the transmission of a command message if the address bytes, the command/ response correlations or error check bytes are not verifiable, thereby enhancing the system's ability to detect and/or reject errors as might be occasioned by noise.
447327
Essex Group Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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