Multiplex communications – Wide area network – Packet switching
Patent
1988-12-07
1990-03-06
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 24, 370 94, H04J 326
Patent
active
049072234
ABSTRACT:
A multiplex system for addressing, commanding and monitoring the status of a plurality of electrical devices disposed throughout a motor vehicle. A dual-duty cycle type voltage waveform generated by a microcomputer provides a polling list of address information address signals for enabling individual controllers connected to a bi-directional single wire bus coupled at one end to a driver and receiver circuit of the microcomputer. After the individual controller is addressed, another portion of the waveform enable the addressed controller to use a voltage signal to operate one of the connected group of elements. Then, another portion of the waveform provides a binary bit used by the addressed controller for establishing the polarity of the command voltage to turn ON and OFF the addressed control element. Circuit within the addressed controller provide current signals indicative of the status of the commanded element.
REFERENCES:
patent: 4715031 (1987-12-01), Crawford et al.
patent: 4736367 (1988-04-01), Wroblewski et al.
patent: 4740952 (1988-04-01), Vernieres et al.
patent: 4809266 (1989-02-01), Okada
patent: 4821262 (1989-04-01), Futami
Chrysler Motors Corporation
Fredericks Wendell K.
Olms Douglas W.
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