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PHP实现连接设备、通讯和发送命令的方法_PHP

May 30, 2016 am 08:44 AM
php Connect devices communication

本文实例讲述了PHP实现连接设备、通讯和发送命令的方法。分享给大家供大家参考。具体如下:

开发的BS架构的软件(PHP),需要跟设备进行通讯,在此记录一下,欢迎各位指正:

1. 采用php socket技术使用TCP/IP连接设备

参数$service_port 连接端口
参数$address 发送IP地址
参数$in 发送命令

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);
}

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Send_socker_xdcoder $buffer为返回值

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;
}

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2. 采用php socket技术使用UDP协议连接设备,实现通讯和发送命令

参数$service_port 连接端口
参数$address 发送IP地址
参数$in 发送命令

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>";
  }
}

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Send_socket_xdcoder_udp $buffer 为返回值

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>";
  }
}

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3. 采用RS232串口技术连接设备,实现通讯和发送命令

参数$com 串口号
参数$baudratr 波特率
参数$in 发送命令

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
}

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还有一个关于命令16进制转换的:

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

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希望本文所述对大家的php程序设计有所帮助。

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