What cables are mainly used in the elevator five-way communication system? What are the wiring steps of the elevator five-way communication system?

The elevator five-way system refers to the property duty room, elevator machine room (top control cabinet without elevator machine room, usually at the top of elevator shaft), car roof (car roof), car bottom and pit (bottom of shaft). The elevator machine room, car roof, car and pit are connected by the spare accompanying cable of the elevator. The call of the first four parties to the property duty room can be realized by wireless communication, and the specific forms are FM broadcast transmission and local call. Because it is wireless, the installation method is simple. FM full duplex installation method is to put a main engine in the property duty room and an extension in the elevator room, and the extension is connected to the car, car roof and pit through the spare accompanying cable of the elevator. The installation method of GSM card is simpler. Put an extension in the elevator machine room, insert a mobile phone card in the extension, and store some necessary numbers in the card.