Comtrol Industrial Ethernet to Serial Device Servers The DeviceMaster® family of serial to Ethernet device servers enable superior device networking capabilities. Connect RS-232/422/485 serial devices to the network with DeviceMaster using your existing software applications. Supports native COM, TTY, or TCP/IP socket communications. Comtrol's DeviceMaster products now feature enhanced security offering SSL & SSH management and SSL serial data stream encryption. DeviceMaster customers can take advantage of our downloads including device drivers, online support, surge protection, serial port test and monitoring software, and device management software to ensure successful implementation.