System of controlling a plurality of copying machines interconnnected through a private branch exchange
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United States of America Patent
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Jan 24, 1995
Grant Date -
N/A
app pub date -
Nov 17, 1992
filing date -
Nov 18, 1991
priority date (Note) -
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Abstract
In a method and system for controlling a plurality of copying machines, plural control units respectively associated with the copying machines are connected with one another by means of a private branch exchange (PBX) telephone system. A control unit calls one or more of the other control units, internally through the extension lines of the PBX, at a prescribed data and time, to detect any abnormality in the operation of the called unit. If an abnormality is detected, a call is placed to a control center located external to the PBX, to thereby inform the control center of the detected abnormality.
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