Surveillance control apparatus for security system
First Claim
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1. A surveillance control system for a security system in which data signals are exchanged between a central station and a plurality of terminal devices, comprising:
- the terminal devices being connected in parallel with each other to a common line extending from said central station;
each terminal device having a self address detector means for detecting whether a received address signal coincides with a self address stored in the detector means unique for each respective terminal device, the detector means then creating an output;
each terminal device having a display driver means for responding to said output from said self address detector means each and every time when address coincidence occurs, and a display unit driven by said display driver means;
said central station having means for generating address signals corresponding to the addresses of the plurality of terminal devices; and
said central station having means for storing an address of a terminal device which is not to be accessed and for selectively not addressing said terminal device when the other terminal devices are being addressed,whereby through observation of the display unit at the terminal device it can readily be determined whether the terminal device is being accessed by the central station.
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Abstract
In a polling type surveillance control apparatus for a security system, inherent addresses are assigned to respective terminal devices such as smoke detectors, temperature sensors, gas leakage detectors, fire partitions and smoke dampers. When a self address detector in the terminal device detects a coincidence between the address signal from a central station and a preset self address, the terminal device indicates it has been accessed or energized and power control thereof may also be performed.
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Citations
23 Claims
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1. A surveillance control system for a security system in which data signals are exchanged between a central station and a plurality of terminal devices, comprising:
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the terminal devices being connected in parallel with each other to a common line extending from said central station; each terminal device having a self address detector means for detecting whether a received address signal coincides with a self address stored in the detector means unique for each respective terminal device, the detector means then creating an output; each terminal device having a display driver means for responding to said output from said self address detector means each and every time when address coincidence occurs, and a display unit driven by said display driver means; said central station having means for generating address signals corresponding to the addresses of the plurality of terminal devices; and said central station having means for storing an address of a terminal device which is not to be accessed and for selectively not addressing said terminal device when the other terminal devices are being addressed, whereby through observation of the display unit at the terminal device it can readily be determined whether the terminal device is being accessed by the central station. - View Dependent Claims (2, 3, 4)
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5. A surveillance control system for a security system in which data signals are exchanged between a central station and a plurality of terminal devices during a defined access period for each device, comprising:
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the terminal devices being connected in parallel with each other to a common line extending from said central station; each terminal device having a self address detector means for detecting whether a received address signal coincides with a self address stored in the detector means unique for each respective terminal device, the detector means then creating an output based on each coincidence; each terminal device having a controlling means directly responsive to each of the outputs from said self address detector means and including a time constant circuit means for providing a time constant longer than the access period, said controlling means having an output which drives a switching means; said switching means connecting to at least one of an indicating device or an environmental parameter detecting device; and said central station having means for generating address signals corresponding to the addresses of the plurality of terminal device, whereby said switching means is activated at the terminal device and is held in its switched condition for a given time constant whenever the terminal device is accessed. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A surveillance contol system for a security system in which data signals are exchanged between a central station and a plurality of terminal devices and wherein an inhibit command at the central station may be employed to prevent a data signal exchange with given terminal devices, comprising:
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the terminal devices being connected in parallel with each other to a common line extending from said central station; each terminal device having a self address detector means for detecting whether a received address signal coincides with a self address stored in the detector means, the detector means then creating an output; said detector means having a programmable read only memory means for storing the self address; said central station having means for generating address signals corresponding to the addresses of the plurality of terminal devices; said central station having means for storing an address of a terminal device which is not to be accessed and for automatically not addressing the terminal device not to be accessed during the addressing; at each terminal device providing said element as at least one of the elements selected from the group consisting of indicating device and environmental parameter detector device so that such element is activated only when the terminal device is accessed. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method for operating a surveillance control system wherein a central station generates address signals for various terminal devices and skips over addresses of those terminal devices for which an input command has been made to inhibit access to the corresponding terminal device, and wherein data signals are exchanged between the central station and the respective terminal devices by use of a self address detector in each terminal device which detects whether a received address signal coincides with a self address stored in the detector, comprising the steps of:
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providing in each terminal device a controlling means responsive to the output from the detector so as to control an element at the terminal device every time the terminal device is accessed; and at each terminal device providing said element as at least one of the elements selected from the group consisting of indicating device and environmental parameter detector device so that such element is activated only when the terminal device is accessed. - View Dependent Claims (20, 21, 22, 23)
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Specification