the WIZ107SR and WIZ108SR are gateway modules that converts serial protocol (TTL, RS-232, -422 or -485) into TCP/IP protocol. It enables remote management and control of a serial device through TCP/IP network. In other words WIZ107SR / WIZ108SR is the protocol converter that transmits the data sent by serial equipment as TCP/IP data type, and converts back the TCP/IP data received through the network into serial data to transmit back to the equipment.