采用本发明技术方案报警时，掉电信号稳定快速传输，且多端口可以同时报警。
When adopting the technical scheme of the invention to alarm, power-down signals transmit stably and fast, and multiple ports can alarm simultaneously.
采用本发明技术方案报警时，掉电信号稳定快速传输，且多端口可以同时报警。
When adopting the technical scheme of the invention to alarm, power-down signals transmit stably and fast, and multiple ports can alarm simultaneously.
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