Atmospheric abnormality detection alarm system
First Claim
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1. An atmospheric abnormality detection alarm system comprising:
- a plurality of sensor terminal means separately connected to a transmission line;
a main unit means connected to the transmission line for generating an address signal cyclically, and also an abnormal state display command signal when a received response data from a sensor terminal means is compared to a reference data and an abnormal state is determined, said main unit means having indicating means for indicating the sensor terminal means having the abnormal state in response to the comparison;
each of said plurality of sensor terminal means having a sensor means and having means for converting an analog output signal from the sensor means corresponding to one of the parameters smoke concentration, temperature, and gas concentration to digital data when each sensor terminal means is accessed by said main unit means in response to a corresponding address signal, and to transmit the digital data as said response data to said main unit means; and
each sensor terminal means having a command discriminator means for receiving and deciphering the abnormal state display command transmitted from said main unit means through the transmission line and a display/alarm circuit means for displaying information indicating an atmospheric abnormality in response to an output signal from said command discriminator means.
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Abstract
An atmospheric abnormality detection system includes a command discriminator and a display/alarm circuit in each sensor terminal. When the command discriminator receives a coincidence signal from an address comparator, the command discriminator causes an A/D converter to convert an analog sensor output to a digital signal as response data. When an abnormal state display command is transmitted from a main unit to the command discriminator, the command discriminator causes the display/alarm circuit to display information indicating the abnormal state and/or generate an audible alarm.
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Citations
6 Claims
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1. An atmospheric abnormality detection alarm system comprising:
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a plurality of sensor terminal means separately connected to a transmission line; a main unit means connected to the transmission line for generating an address signal cyclically, and also an abnormal state display command signal when a received response data from a sensor terminal means is compared to a reference data and an abnormal state is determined, said main unit means having indicating means for indicating the sensor terminal means having the abnormal state in response to the comparison; each of said plurality of sensor terminal means having a sensor means and having means for converting an analog output signal from the sensor means corresponding to one of the parameters smoke concentration, temperature, and gas concentration to digital data when each sensor terminal means is accessed by said main unit means in response to a corresponding address signal, and to transmit the digital data as said response data to said main unit means; and each sensor terminal means having a command discriminator means for receiving and deciphering the abnormal state display command transmitted from said main unit means through the transmission line and a display/alarm circuit means for displaying information indicating an atmospheric abnormality in response to an output signal from said command discriminator means. - View Dependent Claims (2, 3, 4, 5)
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6. An atmospheric abnormality detection alarm system comprising:
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a plurality of sensor terminal means separately connected to a transmission line; a main unit means connected to the transmission line for generating an address signal cyclically, and also an abnormal state display command signal when a received response data is compared to a freely selectable reference data and an abnormal state is determined, said main unit means having indicating means for indicating the abnormal state in response to the comparison; each of said plurality of sensor terminal means having an address comparator, a sensor means, and means for converting an analog output signal from the sensor means corresponding to one of the parameters smoke concentration, temperature, and gas concentration to digital data when each sensor terminal means is accessed by said main unit means in response to a corresponding address signal compared in said address comparator, and to transmit the digital data as said response data to said main unit means; and each sensor terminal means having a command discriminator means for receiving and deciphering the abnormal state display command transmitted from said main unit means through the transmission line and a display/alarm circuit means for displaying information indicating an atmospheric abnormality in response to an output signal from said command discriminator means responsive to an output from said address comparator.
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Specification