bool dio_tcsetattr( resource fd, array options )

<?php
   fd = dio_open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NONBLOCK);
   dio_fcntl(fd, F_SETFL, O_SYNC);
   dio_tcsetattr(fd, array("baud" => 9600, "bits" => 8, "stop"  => 1, "parity" => 0));

   while(1) {data = dio_read(fd, 256);
      if(data) {
         echo $data;
      }
   } 
?>