Serial desde C - termios.h

//Agregar los include string.h, stdio.h, stdlib.h, termios.h (principal) , unistd.h,fcntl.h
//sys/types.h, sys/stat.h, sys/ioctl.h, errno.h

#define Puerto "/dev/ttyUSB0"

int opencom;
struct termios oldtios;
struct termios newtios;
char comando[2];

int main(int argc, char **argv)
{

printf("RS232 Microchip chispi_pic:\n");

opencom=open(Puerto,O_RDWR | O_NOCTTY);
    if(opencom<0){
        fprintf(stderr, "Error: Could not open %s for reading/writing!\n",Puerto);
        exit(-1);
            }
   
    //tcgetattr(opencom,&oldtios);
   
    newtios.c_cflag=B1200 | CS8 | CLOCAL | CREAD;
    newtios.c_iflag=IGNPAR;
    newtios.c_oflag=0;
    newtios.c_lflag=0;           /*No canonico*/
    newtios.c_line=0;
    newtios.c_cc[VMIN]=1;
    newtios.c_cc[VTIME]=0;
           
        tcflush(opencom, TCIFLUSH);   
    tcsetattr(opencom,TCSANOW,&newtios);           
   
        scanf("%s",comando);
     
    write(opencom,comando,2);   
        printf("\n");
    close(opencom);
}