termios to set the serial port

                    struct termios  ios;
                    tcgetattr( fd, &ios );
                    ios.c_lflag = 0;  /* disable ECHO, ICANON, etc... */
                    ios.c_iflag &= ~(INLCR|IGNCR|ICRNL|IXON);
                    ios.c_oflag &= ~(ONLCR|OCRNL);
                    tcsetattr( fd, TCSANOW, &ios );