Electrical monitoring system
First Claim
1. A system for monitoring a location for the occurrence of a predetermined condition thereat;
- comprising;
a transmitter located at the monitored location for normally transmitting a series of first electrical signals at a first repetition rate and in a first time slot;
a sensor at the monitored location for sensing said predetermined condition;
control means effective, upon sensing the predetermined condition, to interrupt the transmission of said first electrical signals and to initiate the transmission of a series of second electrical signals at a second repetition rate and in a second time slot both having a predetermined relation to said first repetition rate and said first time slot of said first electrical signals;
a receiver at a remote location for receiving said first and second electrical signals; and
signalling means actuatable by said receiver when receiving said second electrical signals.
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Accused Products
Abstract
A system for monitoring a location for the occurrence of a predetermined condition thereat includes a transmitter located at the monitored location for normally transmitting a series of first electrical signals at a first repetition rate and in a first time slot; a sensor at the monitored location for sensing the predetermined condition; and a control circuit effective, upon sensing the predetermined condition, to interrupt the transmission of the first electrical signals and to initiate the transmission of a series of second electrical signals at a second repetition rate and in a second time slot both having a predetermined relation to the first repetition rate and the first time slot of said first electrical signals.
24 Citations
19 Claims
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1. A system for monitoring a location for the occurrence of a predetermined condition thereat;
- comprising;
a transmitter located at the monitored location for normally transmitting a series of first electrical signals at a first repetition rate and in a first time slot; a sensor at the monitored location for sensing said predetermined condition; control means effective, upon sensing the predetermined condition, to interrupt the transmission of said first electrical signals and to initiate the transmission of a series of second electrical signals at a second repetition rate and in a second time slot both having a predetermined relation to said first repetition rate and said first time slot of said first electrical signals; a receiver at a remote location for receiving said first and second electrical signals; and signalling means actuatable by said receiver when receiving said second electrical signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19)
- comprising;
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17. A communication system, comprising:
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a transmitter located at a first location for normally transmitting a series of electrical signals at a predetermined repetition rate and in a predetermined time slot; a receiver at a second location for receiving said electrical signals; synchronization means at said second location synchronized by said electrical signals received by the receiver; a logic circuit at said second location controlled by said synchronization means to enable said receiver during periods said electrical signals are to be received within their respective time slots; and control means in said transmitter effective to initiate the transmission of a series of second electrical signals at a second repetition rate and in a second time slot both having a predetermined relation to said first-mentioned repetition rate and time slot of said first-mentioned electrical signals.
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Specification