int initport(int fd)
 {
  struct termios options;
  // Get the current options for the port...
  tcgetattr(fd, &options);
  // Set the input and output baud rates to 19200...
  cfsetispeed(&options, B19200);
  cfsetospeed(&options, B19200);
  // Enable the receiver and set local mode...
  options.c_cflag |= (CLOCAL | CREAD);

  options.c_cflag &= ~PARENB; // No Parity
  options.c_cflag &= ~CSTOPB; // One stop bit
  options.c_cflag &= ~CSIZE;  // Clear out the data bit reg.
  options.c_cflag |= CS8; // Set to 8 data bits.

  // No line processing:
  // echo off, echo newline off, canonical mode off, 
  // extended input processing off, signal chars off
  //
  options.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN | ISIG);

  // Input flags - Turn off input processing
  // convert break to null byte, no CR to NL translation,
  // no NL to CR translation, don't mark parity errors or breaks
  // no input parity check, don't strip high bit off,
  // no XON/XOFF software flow control
  //
  options.c_iflag &= ~(IGNBRK | BRKINT | ICRNL |
                       INLCR | PARMRK | INPCK | ISTRIP | IXON);

  // One input byte is enough to return from read()
  // Inter-character timer off
  //
  options.c_cc[VMIN]  = 1;
  options.c_cc[VTIME] = 0;

  // Set the new options for the port...
  tcsetattr(fd, TCSANOW, &options);
  return 1;
 }

int readport(int fd, unsigned char *result)
 {
  int iIn;
  iIn = read(fd, result, 254);
  result[24] = 0x00;
  if (iIn < 0)
   {
    if (errno == EAGAIN)
     {
      printf("SERIAL EAGAIN ERROR\n");
      return 1;
     }
    else
     {
      printf("SERIAL read error %d %s\n", errno, strerror(errno));
      return 0;
     }
   }                    
  return 1;
 }

     case 4: // Read in the Receive buffer
      memset(&receive_buffer[0], 0, sizeof(receive_buffer));
      if (!readport(fd,receive_buffer))
       {
        printf("read failed\n");
        return 0;
       }
      else
       ++serial_state;
      break;