rs232.txt

rs232 to usb

#include <stdio.h>   /* Standard input/output definitions */
    #include <string.h>  /* String function definitions */
    #include <unistd.h>  /* UNIX standard function definitions */
    #include <fcntl.h>   /* File control definitions */
    #include <errno.h>   /* Error number definitions */
    #include <termios.h> /* POSIX terminal control definitions */

    /*
     * 'open_port()' - Open serial port 1.
     *
     * Returns the file descriptor on success or -1 on error.
     */

    int
    open_port(void)
    {
      int fd; /* File descriptor for the port */


      fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
      if (fd == -1)
      {
       /*
	* Could not open the port.
	*/

	perror("open_port: Unable to open /dev/ttyS0 - ");
      }
      else
	fcntl(fd, F_SETFL, 0);

      return (fd);
    }

    fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);

    n = write(fd, "ATZ\r", 4);
    if (n < 0)
      fputs("write() of 4 bytes failed!\n", stderr);

    fcntl(fd, F_SETFL, FNDELAY);

    fcntl(fd, F_SETFL, 0);

    close(fd);