Multiplex system having digital coded power line signals
First Claim
1. A multiplex system comprising:
- a transmitter;
controller operably coupled to said transmitter for activating said transmitter;
a plurality of receivers remotely located from said transmitter;
a single pair of wires interconnecting said transmitter to said receivers for conducting a coded power signal from said transmitter by said controller;
each of said receivers having a decoding means enabling said receiver to respond to said coded power signal;
said coded power signal is an AC line voltage signal for energizing said power circuits of said receivers and said coded power signal further includes interrupted cycles of the AC voltage constituting a code for generating said output signal from said selected one of said receivers in said plurality of receivers;
said transmitter includes a means for rendering selected ones of said receivers inoperable in accordance with said coded power signal; and
means coupled to said last mentioned means for permitting transmission of said coded power signal for a brief interval.
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Accused Products
Abstract
An electronic control circuit is disclosed herein for transmitting a coded signal and operating power to a selected one of a plurality of receivers via a single pair of wires. The control circuit includes a transmitter coupled to a source of AC line voltage and having a coding network for coding signals consisting of missing cycles from the AC line voltage so that a resultant output signal constitutes both the coded signal to the receiver and the operating power for the same receiver. Timing networks are included in the transmitter control circuit for allowing the output signals to be transmitted to the selected receiver only within a brief time interval. Reset networks are interconnected within the transmitter control circuit and the timing networks for returning the transmitter control circuit back to a condition of awaiting asynchronous commands for forwarding to a selected receiver via the single pair of wires.
43 Citations
4 Claims
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1. A multiplex system comprising:
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a transmitter; controller operably coupled to said transmitter for activating said transmitter; a plurality of receivers remotely located from said transmitter; a single pair of wires interconnecting said transmitter to said receivers for conducting a coded power signal from said transmitter by said controller; each of said receivers having a decoding means enabling said receiver to respond to said coded power signal; said coded power signal is an AC line voltage signal for energizing said power circuits of said receivers and said coded power signal further includes interrupted cycles of the AC voltage constituting a code for generating said output signal from said selected one of said receivers in said plurality of receivers; said transmitter includes a means for rendering selected ones of said receivers inoperable in accordance with said coded power signal; and means coupled to said last mentioned means for permitting transmission of said coded power signal for a brief interval. - View Dependent Claims (2, 3, 4)
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Specification