Flexy Extension Card - 2 Serial Ports This Flexy extension card increase the connectivity capability of the Ewon Flexy with 2 serial ports. The dual serial port extension card off ers OEMs and system integrators the ability to interconnect and retrieve data from serial devices. As a transparent gateway, the Ewon Flexy is the link between any serial devices or PLCs and the Ethernet LAN. As a data acquisition gateway, the Ewon polls the serial devices at defined intervals to feed its internal memory tags with live and time-stamped data. It is compatible with the Ewon Flexy 10x series, 20x series and 205.