PHP实现连接设备、通讯和发送命令的方法

function Send_socket_connect($service_port, $address, $in) {//创建 TCP/IP socket$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("could not create socket!");  //设置超时时间  $timeout = 2;  $time = time();  //设置非阻塞模式  @socket_set_nonblock($socket);  //超时判断  while (!@socket_connect($socket, $address, $service_port)) {    $err = socket_last_error($socket);    // 连接成功，跳出循环    if ($err === 10056) {      break;    }    //连接失败，判断超时时间，停止    if ((time() - $time) >= $timeout) {      socket_close($socket);      print('网络异常，请检查网络连接！！');      exit();    }    // 刷新频率（250毫秒）    usleep(250000);  }  //设置阻塞模式  @socket_set_block($socket);  //发送命令到设备  socket_write($socket, $in, strlen($in));  //关闭连接  socket_close($socket);}

function Send_socket_xdcoder($service_port, $address, $in) {  //创建 TCP/IP socket  $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("could not create socket!");  //设置超时时间  $timeout = 2;  $time = time();  //设置非阻塞模式  @socket_set_nonblock($socket);  //超时判断  while (!@socket_connect($socket, $address, $service_port)) {    $err = socket_last_error($socket);    // 连接成功    if ($err === 10056) {      break;    }    //连接失败，判断超时时间，停止    if ((time() - $time) >= $timeout) {      socket_close($socket);      echo "<script>alert('网络异常，请检查网络连接！！');</script>";      exit();    }    // 刷新频率（250毫秒）    usleep(250000);  }  //设置阻塞模式  @socket_set_block($socket);  //发送命令到设备  socket_write($socket, $in, strlen($in));  //接收设备命令返回数据  $buffer = socket_read($socket, 1024, PHP_NORMAL_READ);  //关闭连接  socket_close($socket);  //输出返回值  return $buffer;}

function Send_socket_connect_udp($service_port, $address, $in) {  //采用php socket技术使用UDP协议连接设备  $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);  @socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => 2, "usec" => 0));  //发送命令  @socket_sendto($socket, $in, strlen($in), 0, $address, $service_port);  @socket_recvfrom($socket, $buffer, 1024, MSG_WAITALL, $address, $service_port);  //关闭连接  if (empty($buffer)) {    echo "<script>alert('网络异常，请检查网络连接！！');</script>";  }}

function Send_socket_xdcoder_udp($service_port, $address, $in) {  //采用php socket技术使用UDP协议连接设备  $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);  @socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => 2, "usec" => 0));  //发送命令  @socket_sendto($socket, $in, strlen($in), 0, $address, $service_port);  @socket_recvfrom($socket, $buffer, 1024, MSG_WAITALL, $address, $service_port);  //关闭连接  socket_close($socket);  if (!empty($buffer)) {    return $buffer;  } else {    echo "<script>alert('网络异常，请检查网络连接！！');</script>";  }}

function rs232_connect($com, $baudrate, $in) {  @set_time_limit(10);  //使用 'windows下设置窜口参数';  exec("mode " . $com . " BAUD=" . $baudrate . " PARITY=n DATA=8 STOP=1 odsr=off");  // "打开端口串口$com";  $f = @fopen($com, 'w+');  //判断串口是否正常打开  if (!$f) {    //echo "<script>alert('Error when open $com！！');</script>";    die("Error when open $com");  }  //向串口发送数据;  fwrite($f, $in);  //关闭端口      fclose($f);  //串口操作结束}

function hexToStr($hex) {  $string = "";  for ($i = 0; $i < strlen($hex) - 1; $i+=3) {    $string.=chr(hexdec($hex[$i] . $hex[$i + 1]));  }  return $string;}