Sideband communication on the standard parallel SCSI bus

Details Sideband communication on the standard parallel SCSI bus Sideband communication on the standard parallel SCSI bus

1997-01-21

1998-11-17

Elms, Richard T.

Electrical transmission or interconnection systems

Superimposed unlike currents

Ac and dc sources

34031002, 34031007, 39575002, H02J 302

Patent

active

058380736

ABSTRACT:
A power supply line of a communications interface provides communication between two devices when one device is unable to utilize the communications interface in a standard manner. The power supply line is specified to operate within a first voltage range and normally operates at a first voltage within a second voltage range, the second voltage range being within the first voltage range. A voltage circuit changes the power supply line to a second voltage outside of the second voltage range but within the first voltage range. A voltage detecting circuit coupled to the power supply line asserts a signal indicating when the second voltage is present on the power supply line, thereby providing communication between the first device and the other device.

REFERENCES:
patent: 4540890 (1985-09-01), Gangemi et al.
patent: 5081440 (1992-01-01), Ott et al.
patent: 5489809 (1996-02-01), Kaya et al.
patent: 5670931 (1997-09-01), Besser et al.
patent: 5684826 (1997-11-01), Ratner
Messmer, Hans-Peter, The Indispensable PC Hardware Book, Your Hardware Questions Answered, Chapter 28, Sections 7.1 through 7.6, Addison-Wesley Publishing Company, Inc., Second Edition, 1995, pp. 806-832.

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