Multiplex communications – Wide area network – Packet switching
Patent
1983-02-24
1985-08-06
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 94, H04J 302, H04J 300, H04J 600
Patent
active
045340250
ABSTRACT:
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 bidirectional 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.
REFERENCES:
patent: 3924240 (1975-12-01), Given
patent: 4139737 (1979-02-01), Shimada et al.
patent: 4270205 (1981-05-01), DeShon
patent: 4290134 (1981-09-01), Hampshire
patent: 4293947 (1981-10-01), Brittain
patent: 4355385 (1982-10-01), Hampshire et al.
patent: 4410983 (1983-10-01), Cope
Chin Wellington
Olms Douglas W.
Schneeberger Stephen A.
United Technologies Automotive Inc.
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