Control system for inhibiting processing communications
First Claim
1. A control system for selectively controlling communications signals on signal lines connecting a transmitting means powered by a power supply, and a device powered by a second power supply the control system including monitoring means operatively connected to the power supply, the monitoring means including means for detecting a transient power state, the detecting means generating a signal in response to a detected transient power state, and inhibiting means, the inhibiting means receiving the detecting means signal and in response thereto inhibiting signal level changes on said lines, whereby spurious communications signal transmissions during transient power states are inhibited.
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Accused Products
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.
23 Citations
14 Claims
- 1. A control system for selectively controlling communications signals on signal lines connecting a transmitting means powered by a power supply, and a device powered by a second power supply the control system including monitoring means operatively connected to the power supply, the monitoring means including means for detecting a transient power state, the detecting means generating a signal in response to a detected transient power state, and inhibiting means, the inhibiting means receiving the detecting means signal and in response thereto inhibiting signal level changes on said lines, whereby spurious communications signal transmissions during transient power states are inhibited.
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11. A method of preventing the transmission of spurious signals on signal lines connecting a transmitting means powered by a power supply and a device powered by a second power supply during transient power states, the method comprising the steps of:
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(a) monitoring the power supply, (b) detecting a decrease in the power supply unregulated voltage level, and (c) inhibiting signal level changes on said lines upon detection of a decrease in the unregulated voltage level. - View Dependent Claims (12, 13, 14)
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Specification