The RS485 Board (3.3V) with extended fittings - raspberry pi rohs manufactured by Waveshare is a general purpose, single-channel RS485 transceiver board designed for direct connectivity to the Raspberry Pi's GPIO bus. It comes equipped with an extended prototyping area to attach external circuit connections with the ability to up to four GPIO pins from the Raspberry Pi up to an RS232 port. This board generates a 3.3V power source and is RoHS compliant, making it a perfect companion for engineering projects. It also supports basic communication between the Raspberry Pi and devices using a compatible communication protocol such as Modbus, Profibus, or Profinet.