RS-485 is one of the most widely used wired interface for industrial long-haul networks. TIA/EIA-485-A standard defines the physical layer of the RS-485 interface. End applications use RS-485 interface coupled with protocol such as Profibus, Modbus or BACnet.
The main benefits of this interface include:
- Balanced differential signaling allows for rejection of common mode noise and facilitates communications over long distances in noisy industrial environments.
- Support of -7 to 12V wide common mode range allows for multipoint data transmission between nodes located at different ground potential difference.
- Data rates up to 50 Mbps at short distances or communications distance up to 1000 meters at slower data rates is possible.
Applications for RS-485 include Energy Meters, Grid Protection relay, Solar inverter, Factory automation, Motor control and Heating, ventilation, air conditioning (HVAC) systems.