(This system is mainly used in residential quarters to transmit various security alarm signals in the household to the management core. The system circuit design is an independent system. The wiring structure in the elevator entrance is a three-bus, and the data transmission adopts low-speed single-line serial coding, which is connected to the 485 bus in the community through the elevator entrance signal converter, so the user defense zone terminal interface board has a simple circuit, low cost and good reliability.)
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