The RS485 to PoE ETH (B) is the hardware upgrade version, supports PoE Ethernet port power supply, with power and signal isolation protection, which is safer for industrial applications. All three versions have the same software functionality. This is a RS485 device data acquisitor / IoT gateway designed for industrial environment. It combines multi functions in one, including serial server, Modbus gateway, MQTT gateway, RS485 to JSON, etc. The module features RS485 and Ethernet port with Power over Ethernet (PoE) and optional screw terminals for an external power supply. Rail-mount case design, small in size, easy to install. It is suitable for applications like data acquisition, IoT gateway, safety & security IoT, and intelligent instrument monitoring.