The Comtrol DeviceMaster RTS 4-Port Device Server is a four-port device server designed for network-enabling serial communications devices. When used with the included NS-Link driver software and a host PC, the DeviceMaster RTS enables placement of COM or TTY ports anywhere on an Ethernet network or across the Internet. DeviceMaster RTS 4-Port Device Server units can be used to create a point-to-point serial tunnel across the network that seamlessly transfers serial data via TCP or UDP socket connections.