Multiplex security system using remote microprocessors
First Claim
1. A security communications system comprising:
- a local panel and a plurality of remote panels interconnected by a common bi-directional data line and a common bi-directional voice line;
remote speaker means and microphone means in each of the remote panels for receiving and transmitting audio signals via said voice line;
local speaker means in the local panel for receiving and reproducing sounds transmitted over said voice line; and
logic means in each of the remote and local panels connected to transmit and receive data signals via the data line, including a unique data signal from the remote panel to request enabling of the local speaker means;
the remote panel logic means being controllingly connected to the remote speaker means and microphone means;
the local panel logic means being controllingly connected to the local speaker means and responsive to receiving said unique data signal via the data line from the logic means of one of the remote panels for selectably enabling said local speaker means to output an audio signal transmitted over the voice line from the microphone means of said one of the remote panels.
1 Assignment
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Accused Products
Abstract
A multiplex security system provides two-way data communications between a local panel and multiple microprocessor-based remote panels interconnected over a common data transmission line. A second line provides two-way voice communications between the local and remote panels with automatic forwarding by an audio/data control selector to a central control unit via a single telephone line. Two additional lines provide a common ground and transmit DC power from the local to the remote panels. The remote panels include bus drivers connected to the communications line for transmitting both ASCII digital data messages and a higher voltage request or SRQ signal to the local panel when the remote panel has a message to transmit. The local panel includes two separate receivers for distinguishing the request signal from digital data and a bus driver for transmitting data. The local panel transmits a grant message which is superimposed over the request signal, reducing its voltage level to zero. The remote panel has a receiver for receiving ASCII data from the local panel and for sensing the reduced voltage level to turn off the request signal. The remote panels are assigned priorities by setting different switch numbers in each panel. The switch numbers correspond to unique brief time slots in which each of the remote panels can commence transmitting. Following a grant command, the remote panels count time slots. None can respond until the count equals its respective switch number, and then only if another panel has not already commenced transmitting.
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Citations
10 Claims
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1. A security communications system comprising:
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a local panel and a plurality of remote panels interconnected by a common bi-directional data line and a common bi-directional voice line; remote speaker means and microphone means in each of the remote panels for receiving and transmitting audio signals via said voice line; local speaker means in the local panel for receiving and reproducing sounds transmitted over said voice line; and logic means in each of the remote and local panels connected to transmit and receive data signals via the data line, including a unique data signal from the remote panel to request enabling of the local speaker means; the remote panel logic means being controllingly connected to the remote speaker means and microphone means; the local panel logic means being controllingly connected to the local speaker means and responsive to receiving said unique data signal via the data line from the logic means of one of the remote panels for selectably enabling said local speaker means to output an audio signal transmitted over the voice line from the microphone means of said one of the remote panels. - View Dependent Claims (2, 3)
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4. A communications system comprising:
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a local panel and a plurality of remote panels interconnected by a common bi-directional data line and a common bi-directional voice line; remote speaker means and microphone means in each of the remote panels and at least speaker means in the local panel for receiving and transmitting audio signals via said voice line; and logic means in each remote and local panel connected for transmitting and receiving data signals via the data line, including a first data signal from the local panel logic means to the remote panel logic means; the remote panel logic means of each panel being controllingly connected to the speaker and microphone means thereof, and responsive to said first data signal to enable one of said speaker means and microphone means in at least one of the remote panels to communicate via the voice line. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A communications system comprising:
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a local panel and a plurality of remote panels interconnected by a bi-directional data line and bi-directional voice line; remote speaker means and microphone means in each of the remote panels for receiving and transmitting audio signals via said voice line; a central station having a voice telephone and a computer; a telephone line interconnecting the local panel and the central station; data communication means in the telephone line for transmitting data between the local panel and the computer; audio control means in the local panel for switching between transmissions of data and voice signals from the local panel to the central station over the telephone line; the remote panels and local panel each including logic means for transmitting and receiving data signals via said data communications line; the local panel logic means controlling the audio control means to enable relaying of said voice communications via the voice line and the telephone line between one of said remote panels and the central station through the local panel.
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Specification