Electrical device command system, single wire bus and smart sing

Details Electrical device command system, single wire bus and smart sing Electrical device command system, single wire bus and smart sing

1988-12-07

1990-04-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 24, 370 941, H04J 326

Patent

active

049205323

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 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 provides information for operating the electrical device in response to a polarity control data bit portion of the same voltage signal to turn the connected element either ON or OFF. Circuits within the addressed controller provides current signal indicative of the ON or OFF statues of the electrical device.

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

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