MIKROE-2821 RS485 3 Click Mikroe MIKROE-2821 RS485 3 Click is designed for use as a UART to RS422/RS485 communication interface. This click is suited for transmitting smaller blocks of data over long distances using the four-wire bus, allowing full-duplex communication. The MIKROE-2821 Click uses Texas Instruments SN65HVD31DR tri-state differential line driver and differential input line receiver. The RS485 3 Click can control building automation systems, light controllers, sensors, and small embedded devices that share the same bus.