How can fire smoke detectors install a few lines of fire smoke alarms?
Fire smoke is generally networked alarmUsually 4 lines
Power line two, 12V or 24V voltage (see alarm host output)The wind is positive and negative, usually black and red, but the garbage team may be mistaken or colorless, preferably with a multimeter
The two signal lines, no positive or negative output, normally closed or normally open signal (see alarm host, but sure) suggest a normally closed fire, the host can break open action, as usual can not be identified but there are mice and cockroaches bite break false risk
