Activity detector usable with a serial data link

Details Activity detector usable with a serial data link Activity detector usable with a serial data link

1982-01-28

1984-12-04

Zache, Raulfe B.

Boots, shoes, and leggings

371 22, G06F 304

Patent

active

044868553

ABSTRACT:
An activity detector device detects the presence or absence of information transmission over a serial data link between a computer system and a peripheral device. If a presence of a data signal exists as determined by the activity detector, the data signal is transmitted through to the computer system. If an absence of the data signal exists as determined by the activity detector, the input transmission link is decoupled from the computer system by the activity detector and places an all ones signal on the input line to the computer system consistent with the I/O protocol.

REFERENCES:
patent: 3810120 (1974-05-01), Huettner et al.
patent: 4340965 (1982-07-01), Beckman et al.
patent: 4374436 (1983-02-01), Armstrong
patent: 4379340 (1983-04-01), Holtey et al.
patent: 4380052 (1983-04-01), Shima
patent: 4409656 (1983-10-01), Andersen
patent: 4410985 (1983-10-01), Yasumoto et al.
patent: 4418409 (1983-11-01), Queen

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