php打开串口RS232

php打开串口RS232

set_time_limit(0);
include_once  "lib/Db.php" ; //dfms数据库操作类
exec( 'mode COM1: baud=9600 data=8 stop=1 parity=n xon=on' );
//打开COM1口 O_RDWR读写模式 O_RDONLY只读
$fd = dio_open( 'COM1:' , O_RDWR);
//打开失败报错
if (!$fd)
{
die( "Error when open COM1" );
}
//开始
$ff = dio_stat($fd);
//写信息
//dio_write($fd,chr(0).chr(1));
//读取长度
$len = 80;
while (1){
//读取信息
$data = dio_read($fd, $len);
if ($data){
echo $data;
echo  "\r\n" ;
}
//sleep(1);
//dio_close($fd);
usleep(1000000 * 0.5);
}