In the communication line, the corresponding high voltage is applied, including the office power supply, the call signal and the test signal.

PLC’s high reliability, high anti-interference, strong self-correction and self-diagnosis ability promote the wide application of the market, the innovative development of PLC technology, and the variety of PLC products are also more and more, so the reasonable selection of PLC

Inverter air conditioners add frequency converters to the structure of conventional air conditioners. The compressor is the heart of the air conditioner, and its speed directly affects the efficiency of the air conditioner.