ACS-R5401FL is designed ATOM N270 based without fan for rugged environment and it can operate up to 55 degree Celsius. ACS-R5401FL series have 8 or 16 x COM ports which are 3-in-1 selectable for RS-232, RS-422 and RS-485. IT specialists can select suitable protocol to connect their devices and all of these ports are protected from ESD surge.