Data transfer apparatus with automatic transmission rate adjustm

Details Data transfer apparatus with automatic transmission rate adjustm Data transfer apparatus with automatic transmission rate adjustm

1995-08-29

1997-10-21

Shin, Christopher B.

Pulse or digital communications

Repeaters

Testing

395885, 395558, 395556, 395114, 375362, 375359, 375369, 375364, G06F 300

Patent

active

056805969

ABSTRACT:
A data transfer apparatus includes a computer-side input and output unit for transmitting a data signal which is periodically updated, and a printer-side input and output unit for receiving the data signal transmitted from the computer-side input and output unit and detecting the logic level of the data signal. Particularly, this data transfer apparatus further includes a state transition time measuring circuit, a computer-side CPU, and a printer-side CPU cooperated to transmit a transition test data signal from the computer-side input and output unit in a tuning mode, measure the transition time of the transition test data signal received by the printer-side input and output unit, and adjust transfer parameters which define the transmission rate of the data signal to be transmitted from the computer-side input and output unit and a timing for detecting the logic level of the data signal, on the basis of a result of measurement.

REFERENCES:
patent: 4577318 (1986-03-01), Whitacre
patent: 4661966 (1987-04-01), Schreiner
patent: 4756007 (1988-07-01), Quresshi
patent: 5371766 (1994-12-01), Gerbach et al.
patent: 5471145 (1995-11-01), Mydill
patent: 5504929 (1996-04-01), Blair et al.
patent: 5515359 (1996-05-01), Zheng
patent: 5524184 (1996-06-01), Johnson

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