Single wire plug-in circuit board status monitor

Details Single wire plug-in circuit board status monitor Single wire plug-in circuit board status monitor

1990-03-30

1992-07-28

Atkinson, Charles E.

Excavating

324158R, 371 221, G01R 3128, G06F 1100

Patent

active

051346176

ABSTRACT:
The status of individual plug-in circuit boards is monitored by a central control unit via an associated single service request wire, in conjunction with a serial data link. The central control unit interrogates possible operational states, e.g., removed, power loss or other failure, operating properly or requesting service, of a plug-in circuit board by controlling a resistive load connected to the single service request wire for the associated plug-in circuit board. This is realized by employing a logic circuit which is controlled by a microprocessor to supply different logic states to a resistor connected to the service request wire at the central control unit.

REFERENCES:
patent: 4168527 (1979-09-01), Winkler
patent: 4180203 (1979-12-01), Masters
patent: 4291404 (1981-09-01), Steiner
patent: 4308615 (1981-12-01), Koegel et al.
patent: 4380070 (1983-04-01), Steiner
AT&T DDM-1000 User's Manual, AT&T 363-206-100, "Dual DS3 Multiplexer For Both Loop and Trunk", 1988, pp. 1-16.

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