使用rxtxComm處理RS232 DB9中的握手線

Question

我使用rxtxComm與Arduino（USB串行端口）進行通信（發送和接收數據）。我如何使用rxtxComm庫來處理像DTR這樣的握手線？你能給我一些關於這個或一些示例代碼的教程？

• 注：我使用win7操作系統。我今天（21-4-2012）購買了USB-Serial（DB9）適配器;計劃直接連接一個LED陣列到rs232 ...

Answer 1

我想你已經安裝了所有庫。

更改爲您的端口defaultPort =「COM24」;

嘗試標準代碼

package serialtest; 

import java.util.*; 
import gnu.io.*; 
import java.io.IOException; 
import java.io.OutputStream; 


public class DXSimpleWrite { 
    static Enumeration  portList; 
    static CommPortIdentifier portId; 
    static String   msgStr = "Hello, world!"; 
    static SerialPort   serialPort; 
    static OutputStream  outputStream; 
    static boolean  outputBufferEmptyFlag = false; 

    public static void main(String[] args) { 
    boolean portFound = false; 
    String defaultPort = "COM24"; 

    if (args.length > 0) { 
     defaultPort = args[0]; 
    } 

    portList = CommPortIdentifier.getPortIdentifiers(); 

    while (portList.hasMoreElements()) { 
     portId = (CommPortIdentifier) portList.nextElement(); 

     if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) { 

     if (portId.getName().equals(defaultPort)) { 
      System.out.println("Found port " + defaultPort); 
      portFound = true; 
      try { 
      serialPort = 
       (SerialPort) portId.open("SimpleWrite", 2000); 
      } catch (PortInUseException e) { 
      System.out.println("Port in use."); 
      continue; 
      } 

      try { 
      outputStream = serialPort.getOutputStream(); 
      } catch (IOException e) {} 

      try { 
      serialPort.setSerialPortParams(9600, 
           SerialPort.DATABITS_8, 
           SerialPort.STOPBITS_1, 
           SerialPort.PARITY_NONE); 
      } catch (UnsupportedCommOperationException e) {} 

      try { 
       serialPort.notifyOnOutputEmpty(true); 
      } catch (Exception e) { 
      System.out.println("Error setting event notification"); 
      System.out.println(e.toString()); 
      System.exit(-1); 
      } 

      System.out.println(
       "Writing "+msgStr+"\" to "+serialPort.getName()); 
      try { 
      outputStream.write(msgStr.getBytes()); 
      } catch (IOException e) {} 

      try { 
       Thread.sleep(2000); // Be sure data is xferred before closing 
      } catch (Exception e) {} 
      serialPort.close(); 
      System.exit(1); 
     } 
     } 
    } 

    if (!portFound) { 
     System.out.println("port " + defaultPort + " not found."); 
    } 
    } 


} 

好運！