Control device in image forming apparatus

Details Control device in image forming apparatus Control device in image forming apparatus

1990-01-08

1991-02-26

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355308, 340679, 364550, G03G 1500

Patent

active

049965620

ABSTRACT:
A control device in an image forming apparatus whose main body is connected to one or more options through two-way serial lines having feeding and receiving lines, can determine whether the main body of the image forming apparatus and each of the options are not connected or not, or the power supply of the option is off or not on the basis of determination whether a signal level on the receiving serial line is a reference level or less or more over a predetermined constant time period if a response signal from the option is not sent back to the main body and correspondingly, can automatically subject the option to suitable control processing.

REFERENCES:
patent: 4449812 (1984-05-01), Furnichi et al.
patent: 4951235 (1990-08-01), Mori

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