I am trying to do serial communication with the a device. My java code runs on windows and linux (ubuntu) also. Now I am using gnu.io for serialcommunication. My code is working fine till writing byte array on device but there is But I dont see any movement of data. I tried SerialInputDisplay, SerialInputDisplay2 and VonHippelSerialExample. But none of them woked. Is there any different procedure to run these programs? I want a perfect running code of serial-communication.