modbus串口调试

1.window7 64位操作系统的话 要使用java 64位的串口通信包：http://download.youkuaiyun.com/detail/likekobe2012/9149871

将里面的三个文件分别放到这里 <JAVA_HOME>代表你的jdk安装目录，比如我的是C:\Program Files (x86)\Java\jdk1.6.0_31

Copy RXTXcomm.jar —> <JAVA_HOME>/jre/lib/ext
Copy rxtxSerial.dll —> <JAVA_HOME>/jre/lib/i386/
Copy rxtxParallel.dll —> <JAVA_HOME>/jre/lib/i386/

2.再把rxtxSerial.dll、rxtxParallel.dll复制到C:\Windows\System32文件夹下

3.开启MyEclipse新建项目，BuildPath导入RXTXcomm.jar

4.利用虚拟串口工具建立一个虚拟串口对，http://download.youkuaiyun.com/detail/likekobe2012/9149879，这里将COM2、COM5建立串口对

5.利用串口调试工具，开启两个，进行测试，com2、com5是可以通信的，http://download.youkuaiyun.com/detail/likekobe2012/9149929

6.代码

package com;

import gnu.io.CommPortIdentifier;
import gnu.io.PortInUseException;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.TooManyListenersException;

/**
*

• 串口工具的调试

• <功能详细描述>

• @author like

• @version [版本号, 2015-9-30]

• @see [相关类/方法]

• @since [产品/模块版本]
  */
  public class CommTest implements Runnable, SerialPortEventListener
  {
  private String m_sAppName = “串口测试工具Like”;

  /**

  • 端口的等待时间
    */
    private int m_iWaitTime = 2000;

  /**

  • 线程时间
    */
    private int m_iThreadTime = 0;

  private CommPortIdentifier m_commPort;

  private SerialPort m_serialPort;

  private InputStream m_inputStream;

  private OutputStream m_outputStream;

  /**

  • 列出所有端口

  • <功能详细描述>

  • @see [类、类#方法、类#成员]
    */
    @SuppressWarnings(“rawtypes”)
    public void listPort()
    {
    CommPortIdentifier commPortIdentifier;
    Enumeration enumeration = CommPortIdentifier.getPortIdentifiers();
    System.out.println(“现在列出所有PC端口：” + enumeration);

    while (enumeration.hasMoreElements())
    {
    commPortIdentifier = (CommPortIdentifier)enumeration.nextElement();
    if (commPortIdentifier.getPortType() == CommPortIdentifier.PORT_SERIAL)
    {
    System.out.println(commPortIdentifier.getName() + “,” + commPortIdentifier.getCurrentOwner());
    }
    }
    }

  /**

  • 根据端口名选中端口

  • <功能详细描述>

  • @param sPortName

  • @see [类、类#方法、类#成员]
    */
    @SuppressWarnings(“rawtypes”)
    public void selectPort(String sPortName)
    {
    m_commPort = null;
    CommPortIdentifier commPortIdentifier;
    Enumeration enumeration = CommPortIdentifier.getPortIdentifiers();

    while (enumeration.hasMoreElements())
    {
    commPortIdentifier = (CommPortIdentifier)enumeration.nextElement();

     if (commPortIdentifier.getPortType() == CommPortIdentifier.PORT_SERIAL
         && commPortIdentifier.getName().equals(sPortName))
     {
         m_commPort = commPortIdentifier;
         openPort();
         break;
     }
    

    }
    }

  /**

  • 打开端口

  • <功能详细描述>

  • @see [类、类#方法、类#成员]
    */
    public void openPort()
    {
    if (m_commPort == null)
    {
    log(String.format(“无法找到名字为’%1$s’的串口”, m_commPort.getName()));

    }
    else
    {
    log(“端口选择成功，当前端口：” + m_commPort.getName() + “，现在实例化 serialPort:”);

     try
     {
         m_serialPort = (SerialPort)m_commPort.open(m_sAppName, m_iWaitTime);
         log("实例化 serialPort成功！");
     }
     catch (PortInUseException e)
     {
         throw new RuntimeException(String.format("端口'%1$s'正在使用中!", m_commPort.getName()));
     }
    

    }
    }

  /**

  • 检查端口是否正确连接

  • <功能详细描述>

  • @see [类、类#方法、类#成员]
    */
    public void checkPort()
    {
    if (m_commPort == null)
    {
    throw new RuntimeException(“没有选择端口，请使用 selectPort(string sPortName)方法选择端口”);
    }
    if (m_serialPort == null)
    {
    throw new RuntimeException(“serialPort对象为null”);

    }
    }

  /**

  • 向端口发送数据

  • <功能详细描述>

  • @param sMessage

  • @see [类、类#方法、类#成员]
    */
    public void write(String sMessage)
    {
    checkPort();
    try
    {
    m_outputStream = new BufferedOutputStream(m_serialPort.getOutputStream());
    }
    catch (IOException e)
    {
    throw new RuntimeException(“获取端口的OutputStream出错” + e.getMessage());
    }

    try
    {
    m_outputStream.write(sMessage.getBytes());
    log(“向端口发送信息成功：” + sMessage);
    }
    catch (IOException e)
    {
    throw new RuntimeException(“向端口发送信息时出错：” + e.getMessage());
    }
    finally
    {
    try
    {
    m_outputStream.close();
    }
    catch (Exception e)
    {

     }
    

    }
    }

  /**

  • 开始监听从端口中接收的数据

  • <功能详细描述>

  • @param iTime

  • @see [类、类#方法、类#成员]
    */
    public void startRead(int iTime)
    {
    checkPort();
    try
    {
    m_inputStream = new BufferedInputStream(m_serialPort.getInputStream());
    }
    catch (IOException e)
    {
    throw new RuntimeException(“获取端口的InputStream出错：” + e.getMessage());
    }

    try
    {
    m_serialPort.addEventListener(this);
    }
    catch (TooManyListenersException e)
    {
    throw new RuntimeException(e.getMessage());
    }

    m_serialPort.notifyOnDataAvailable(true);

    log(String.format(“开始监听来自’%1KaTeX parse error: Expected '}', got 'EOF' at end of input: …ormat("监听程序将在%1d秒后关闭”, m_iThreadTime));
    }
    }

  public void close()
  {
  m_serialPort.close();
  m_serialPort = null;
  m_commPort = null;
  }

  /**

  • 记录日志
  • <功能详细描述>
  • @param sMessage 日志信息
  • @see [类、类#方法、类#成员]
    */
    public void log(String sMessage)
    {
    System.out.println(m_sAppName + “–>” + sMessage);
    }

  @Override
  public void run()
  {
  try
  {
  Thread.sleep(m_iThreadTime);
  m_serialPort.close();
  log(String.format(“端口’%1$s’监听关闭了！”, m_commPort.getName()));
  }
  catch (Exception e)
  {
  e.printStackTrace();
  }
  }

  @Override
  public void serialEvent(SerialPortEvent arg0)
  {
  switch (arg0.getEventType())
  {
  case SerialPortEvent.BI?Break interrupt,通讯中断/
  case SerialPortEvent.OE:/Overrun error，溢位错误/
  case SerialPortEvent.FE:/Framing error，传帧错误/
  case SerialPortEvent.PE?Parity error，校验错误/
  case SerialPortEvent.CD?Carrier detect，载波检测/
  case SerialPortEvent.CTS:/Clear to send，清除发送/
  case SerialPortEvent.DSR:/Data set ready，数据设备就绪/
  case SerialPortEvent.RI:/Ring indicator，响铃指示/
  case SerialPortEvent.OUTPUT_BUFFER_EMPTY:/Output buffer is empty，输出缓冲区清空/
  break;
  case SerialPortEvent.DATA_AVAILABLE:/Data available at the serial port，端口有可用数据。读到缓冲数组，输出到终端/
  byte[] readBuffer = new byte[1024];
  String readStr = “”;
  String s2 = “”;

           try
           {
               while (m_inputStream.available() > 0)
               {
                   m_inputStream.read(readBuffer);
                   readStr += new String(readBuffer).trim();
               }
               
               s2 = new String(readBuffer).trim();
               
               log("接收到端口返回数据(长度为" + readStr.length() + ")：" + readStr);
               log(s2);
           }
           catch (IOException e)
           {
           }
   }
  

  }

}

7.由于com2、com5是连接的，我们测试的时候，向com2写数据，串口调试助手com5里面是可以接收到数据的

package com;

public class CommUseTest
{
public static void main(String[] args)
throws InstantiationException, IllegalAccessException
{
CommTest com = new CommTest();

    com.listPort();
    
    com.selectPort("COM2");
    com.write("Too young Too simple,sometimes naive!!!");
    com.startRead(10);
}

}

8.利用java程序接收从串口调试助手发来的信息，串口调试助手利用com5发送数据

package com;

public class CommUseTest
{
public static void main(String[] args)
throws InstantiationException, IllegalAccessException
{
CommTest com = new CommTest();

    com.listPort();
    
    com.selectPort("COM2");
    //com.write("Too young Too simple,sometimes naive!!!");
    com.startRead(100);
}

}

---

作者：奚学长又装死
来源：优快云
原文：https://blog.youkuaiyun.com/likekobe2012/article/details/48828619
版权声明：转载 奚学长又装死 的博客