| 摘要 |
CITY TIE LINE CONNECTION FOR FIRE ALARM SYSTEM Improvement to a fire alarm system that enables a city tie line connection to be made selectively. Terminal units at a variety of locations are coupled or connected in separate, independent loops within the system such that serial synchronous power transmission and data communication is effectuated over the individual loops. A master controller at a central location is programmed to recognize that certain terminal units connected in particular loops of the system are in alarm states and to cause a city tie line connection to be made, selectively, whereby a municipal fire department or the like is informed of the particularly critical alarms emanating from those terminal units.
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