Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1991-09-05
1993-07-13
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 34082512, G08B 2600
Patent
active
052277631
ABSTRACT:
Disclosed is an anti-disaster system in which terminals are called by the polling system and in which the response signals from the terminals are received and decoded by a receiver to issue an alarming. Each of the terminals has an interrupt transmission section for transmitting an interrupt signal at a predetermined time during the receiver's transmission of the calling signal when an abnormality is detected. The receiver has an interrupt detection section for monitoring the predetermined time during the transmission of the calling signal to detect an interrupt signal from the terminal, and a calling control means for sequentially performing terminal group calling when the interrupt detection output is obtained from said interrupt signal detection section to specify the terminal in which abnormality data is detected. The receiver transmits a calling signal for interrupt confirmation to the terminals when it receives the interrupt detection output of the interrupt detection section to allow the terminal to transmit an interrupt response signal which indicates the cause of generation of the interrupt. The receiver transmits the calling signals in a voltage mode, and the terminals transmit the terminal response signals in a current mode. Since interrupt data is transmitted from the terminal using the predetermined time during the receiver's transmission of the calling signal, group calling can be performed without delay to specify the terminal in which an abnormality is detected. Consequently, the time required to make the abnormality determination can be shortened.
REFERENCES:
patent: 3806872 (1974-04-01), Odom
patent: 4586040 (1986-04-01), Akiba et al.
patent: 4996518 (1991-02-01), Takahashi et al.
patent: 5061922 (1991-10-01), Nishijima et al.
patent: 5101199 (1992-03-01), Suzuki
Crosland Donnie L.
Hochiki Kabushiki Kaisha
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