Dear Experts, I am using the following code while opening USB Serial to make it as raw port. tcgetattr( rtio_port, &cdco); cfmakeraw( &cdco); cdco.c_cflag |= CS8 | CLOCAL | CREAD; tcsetattr( port, TCSANOW, &cdco); After opening the port, If I close and open my application, without restarting the system, I was unable to open my serial port again with this options. Where as if I comment the following lines of code in my application (Without restart the system), I was able open the serial port. Pleas let me know, what can I do to fix this. Regards, RD -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html