Rs-486 

A building management system (BMS) is a network of electronic devices used to monitor and control the mechanical, lighting, and other systems in a building. The RS-486 interface is one type of interface that can be used to connect the various devices in a BMS. The RS-486 interface is a serial communications interface that uses twisted pair wiring to connect devices.

It is similar to the RS-232 interface, but can be used to connect up to 32 devices on a single bus. The RS-486 interface is commonly used to connect devices such as temperature sensors, humidity sensors, and lighting controllers.