Data switch and data switching method for Bi-tronics printer

Details Data switch and data switching method for Bi-tronics printer Data switch and data switching method for Bi-tronics printer

1996-08-09

1998-11-03

Burr, Edgar S.

Typewriting machines

Safety switch or condition-responsive-cutoff switch for...

395114, B41J 2938

Patent

active

058298940

ABSTRACT:
The present invention discloses a data switch for a Bi-Tronics printer that keeps the Bi-Tronics printer in the use of data switch by adding a controller circuit which provides simulating responding signals to a disconnected computer. When the data switch is turned to different position, that is, the Bi-Tronics printer is in fact disconnected with the computer, a pseudo signal will be provided by the controller circuit to deceive the computer that the printer is still connected. Therefore, the driver of the Bi-Tronics printer in computer could not detect the abnormal condition of the Bi-Tronics printer, so that, the error massage will not appear on the screen and the data switch could still function properly between the computer and the Bi-Tronics printer without interrupting the user.

REFERENCES:
patent: 3219785 (1965-11-01), Allison
patent: 4426166 (1984-01-01), Bowling
patent: 5090830 (1992-02-01), Kroeger et al.
patent: 5303067 (1994-04-01), Kang et al.
patent: 5418891 (1995-05-01), Yang
patent: 5541582 (1996-07-01), Wagner et al.

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