RS485lle

RS485 is a standard defining the electrical characteristics of drivers and receivers for use in balanced digital multipoint systems. It is commonly used in industrial environments for communication between devices over long distances. The standard was developed by the Telecommunications Industry Association (TIA) and the Electronic Industries Alliance (EIA) and is officially known as TIA/EIA-485.

RS485 is a differential signaling standard, meaning it uses two wires to transmit data. This differential signaling allows for longer cable runs and better noise immunity compared to single-ended signaling standards like RS232. The standard specifies the electrical characteristics of the drivers and receivers, including voltage levels, current levels, and impedance.

RS485 supports multipoint communication, allowing multiple devices to be connected to the same bus. This is achieved through the use of a bus termination resistor at each end of the bus to prevent signal reflections. The standard also specifies the use of a half-duplex communication protocol, where only one device can transmit data at a time.

RS485 is commonly used in industrial automation, building automation, and other applications where reliable communication over long distances is required. It is often used in conjunction with other standards such as Modbus, Profibus, and CANopen for industrial communication. The standard is widely supported by a variety of manufacturers, making it a popular choice for industrial communication applications.