Which two wires are used to connect the infrared receiver of the hotel air conditioner with the gateway?

The infrared receiver of hotel air conditioner is connected to the live wire and the zero wire of the gateway. If the external machine has a control line, that is to say, a signal line, generally speaking, four lines plus a signal line. If the signal line has a socket, it can be plugged directly. If there are four wires, look at the color first, and generally mark them on the terminals, as long as they correspond. If there is no color, according to the regulations, red fire line, black zero line and yellow-green grounding. The external machine has two sets of 220V power supplies to control the fan and compressor respectively.