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I know this question is scattered all over the internet, but still, nothing is getting me completely there yet. I want to write data to a serial port in C++ (linux) for a a Propeller board. Program works fine when taking input from the console, but when I write strings to it always return: ERROR - Invalid command from the device. I tried creating array of char with Hex values then it worked. here's a working code, below. But how will i be able to just provide a string variable of command and send it to the serial port? perhaps, how do you I convert it to hex values if it's the only way? Thanks everyone note: the loop is to use user input from console. What i need is a way to send a string variable to the serial port. #include <string.h> #include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <termios.h> int main(int argc,char** argv){ struct termios tio; struct termios stdio; int tty_fd; fd_set rdset; unsigned char c='D'; printf("Please start with %s /dev/ttyS1 (for example)\n",argv[0]); memset(&stdio,0,sizeof(stdio)); stdio.c_iflag=0; stdio.c_oflag=0; stdio.c_cflag=0; stdio.c_lflag=0; stdio.c_cc[VMIN]=1; stdio.c_cc[VTIME]=0; tcsetattr(STDOUT_FILENO,TCSANOW,&stdio); tcsetattr(STDOUT_FILENO,TCSAFLUSH,&stdio); fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK); // make the reads non-blocking memset(&tio,0,sizeof(tio)); tio.c_iflag=0; tio.c_oflag=0; tio.c_cflag=CS8|CREAD|CLOCAL; // 8n1, see termios.h for more information tio.c_lflag=0; tio.c_cc[VMIN]=1; tio.c_cc[VTIME]=5; tty_fd=open(argv[1], O_RDWR | O_NONBLOCK); cfsetospeed(&tio,B115200); // 115200 baud cfsetispeed(&tio,B115200); // 115200 baud tcsetattr(tty_fd,TCSANOW,&tio); //char s

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