EMU2101 is an industrial-grade design rail RS485 serial server, with RS485 to Ethernet two-way transparent transmission function; and supports Modbus gateway function, completes the mutual conversion between Modbus-RTU and Modbus-TCP protocols. It integrates an optimized TCP/IP protocol stack, and parameter modification can be completed only by simple setting of the built-in web page, which greatly saves manpower and material resources. This product has been strictly tested on the industrial site and can be used in various complex network environments.