我有一個發送數據輸入到重量平衡的問題。我需要發送一個ESC P CR LF命令。我使用RXTX庫。我不知道爲什麼它不起作用。以下是代碼。如何發送命令到串口(JAVA + RXTX)

public static class SerialWriter implements Runnable

{

OutputStream out;

public SerialWriter (OutputStream out)

{

this.out = out;

}

public void run()

{

try

{

while (true)

{

this.out.write(new byte[]{0x1B, 0x50, 0x0D, 0x0A});

Thread.sleep(1000);

}

}

catch (IOException | InterruptedException e)

{

e.printStackTrace();

}

}

}

我試過flush，但什麼也沒有發生。 我附上下面的完整(修改)代碼。

package model;

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.SerialPort;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

public class FirstSteps

{

public FirstSteps()

{

super();

}

void connect (String portName) throws Exception

{

CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);

if (portIdentifier.isCurrentlyOwned())

{

System.out.println("Error: Port is currently in use");

}

else

{

System.out.println("Connect 1/2");

CommPort commPort = portIdentifier.open(this.getClass().getName(),6000);

if (commPort instanceof SerialPort)

{

System.out.println("Connect 2/2");

SerialPort serialPort = (SerialPort) commPort;

System.out.println("BaudRate: " + serialPort.getBaudRate());

System.out.println("DataBIts: " + serialPort.getDataBits());

System.out.println("StopBits: " + serialPort.getStopBits());

System.out.println("Parity: " + serialPort.getParity());

System.out.println("FlowControl: " + serialPort.getFlowControlMode());

serialPort.setSerialPortParams(4800,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_ODD);

serialPort.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN);

System.out.println("BaudRate: " + serialPort.getBaudRate());

System.out.println("DataBIts: " + serialPort.getDataBits());

System.out.println("StopBits: " + serialPort.getStopBits());

System.out.println("Parity: " + serialPort.getParity());

System.out.println("FlowControl: " + serialPort.getFlowControlMode());

InputStream in = serialPort.getInputStream();

OutputStream out = serialPort.getOutputStream();

(new Thread(new SerialReader(in))).start();

(new Thread(new SerialWriter(out))).start();

}

else

{

System.out.println("Error: Only serial ports are handled by this example.");

}

}

}

/** */

public static class SerialReader implements Runnable

{

InputStream in;

public SerialReader (InputStream in)

{

this.in = in;

}

public void run()

{

byte[] buffer = new byte[1024];

int len = -1;

try

{

while ((len = this.in.read(buffer)) > -1)

{

//System.out.println("Received a signal.");

System.out.print(new String(buffer,0,len));

}

}

catch (IOException e)

{

e.printStackTrace();

}

}

}

/** */

public static class SerialWriter implements Runnable

{

OutputStream out;

public SerialWriter (OutputStream out)

{

this.out = out;

}

public void run()

{

try

{

byte[] array = {0x1B, 0x50, 0x0D, 0x0A};

while (true)

{

this.out.write(new byte[]{0x1B, 0x50, 0x0D, 0x0A});

this.out.flush();

Thread.sleep(1000);

}

}

catch (IOException | InterruptedException e)

{

e.printStackTrace();

}

}

}

public static void main (String[] args)

{

try

{

(new FirstSteps()).connect("COM7");

}

catch (Exception e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

2013-10-30

jlz