Twisted pair wire. According to the query Qijia.com learned that the bus of the intelligent lighting control system of the chartered room is communicated with 485 protocol, using twisted-pair wires, which are pulled from the network bridge to the on-site control panel and the control module in the electric box, and strung together in a hand-to-hand connection. Twisted-pair cable is a comprehensive wiring project in the most commonly used transmission medium, is composed of two copper wires with an insulating protective layer. The two insulated copper wires are twisted together with each other according to a certain density, and the waves radiated by each wire in transmission will be canceled out by the waves emitted from the other wire, effectively reducing the degree of signal interference.