Environmental abnormality alarm apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 8, 1990
Grant Date -
N/A
app pub date -
Mar 21, 1988
filing date -
Apr 8, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An enviromental abnormality alarm apparatus includes a plurality of terminals connected to a transmission line and a central processing unit. A specific address is assigned to each of the terminals. The central processing unit sequentially circularly accesses the addresses of the terminals and receives a signal corresponding to a physical change such as a fire, gas leakage, or burglary supplied from each terminal. Each terminal includes an alarm determination reference setting unit, a comparator for comparing the physical change signal with an alarm determination reference value, and an output unit for supplying a comparison result from the comparator. The alarm determination reference value of the alarm determination reference setting unit is set by transmitting and receiving data to and from the central processing unit.
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