Excavating
Patent
1981-04-30
1983-08-16
Atkinson, Charles E.
Excavating
340663, 371 4, G06F 1130
Patent
active
043995381
ABSTRACT:
A control system is employed to selectively inhibit false signal transmissions between a communications processor and a plurality of peripheral devices during transient power states. The control system includes a comparator which detects a decrease in the unregulated power supply voltage as compared to the regulated voltage to anticipate an impending loss in regulated voltage. In response to a detected drop in unregulated voltage, a transistor interrupts the power supply to communications lines. Simultaneously, the transistor interrupts the power supply to a light source of an optically coupled relay which is employed to actuate a peripheral such as a mailing machine. In order to assure that the communications processor will initiallize after a transitory drop and a recovery in line voltage, a processor reset signal is also generated by the control system as a function of a detected decrease in unregulated voltage.
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Rayside et al., A Minicomputer Power Fail Detection System, Chemical Instrumentation, vol. 7, No. 3, 1976, pp. 211-218.
Cholakian Gary H.
Rubinstein Arthur
Steinmetz John H.
Atkinson Charles E.
Pitney Bowes Inc.
Scribner Albert W.
Soltow, Jr. William D.
Whisker Robert H.
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