Communicating with Serial Port

Hi,
Hi I have an application that i have to communicate with serial port...
Its working perfectly if am giving all the com settings as constants(pls hav a look @ codea).
But i want to read the port number and baud reate from text file.When i changed the coding,in the serial
setting i was not even able to find the port number and baud rate.it was displaying as buffer size.I think the way i connected the port number and baudrate to the clusture may be wrong(pls refer codeb).How do i fix this problem?
Thanks in Advance....
Solved!
Go to Solution.
Attachments:
modemsetting.JPG ‏88 KB

The problem I think is that you don't have a cluster tied to the center terminal of the bundler so most of the values don't have a name. Wire the cluster from above to the center terminal on the lower bundler. BTW, it doesn't matter what values are in the cluster you wire up because they will be overwritten.
Mike...
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"... after all, He's not a tame lion..."
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Communicating jsp with serial port

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package serialio;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
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import java.io.InputStreamReader;
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import javax.comm.SerialPortEvent;
import javax.comm.UnsupportedCommOperationException;
* @author SASH
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this code is working correct getting output at system output terminal but i want use further in as input for my jsp how to get this ?.......
arata method is also working correct in class but it is not returnig value in jsp?
plz give me way how to take string as input ...........

Any way to communicate with Serial PORT using JavaScript

is there any way to communicate with Serial PORT using JavaScript ??
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such as when client pressed the button, a javascript function will be called and in that function I need to communicate with the serial port of that client... That action will not go to server side.

Is there any way to send a string of bytes to the serial port from the client side ?
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Hello,
I have labview 7.0 and I have to use a HP 34970a with serial port.
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Thanks
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Hi Vincent,
> I have labview 7.0 and I have to use a HP 34970a with serial port.
> Can anyone say to me any advice to do it?
> Where can I find some material?
Your first step should be visiting http://ni.com/idnet and search for an
instrument driver for your device (in this case I can promise you will
find one).
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Hello to all!
I have an oxygen analyser, the equipment has a serial port for communication, being based the communication on the AK communication protocol.
In order to request to the equipment that responds with the measured value, the following command in hexadecimal is sent: (02 78474B4FE20 03), obtaining like hexadecimal answer the following: (02 58474B4FE203220323038353030 03), in which it is included the measured value.
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Attachments:
Test_AK.zip ‏32 KB

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P.M.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion
Attachments:
serial read.vi ‏67 KB

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Although I am an HP employee, I am speaking for myself and not for HP.
**Click on “Kudos” Star if you think this reply helped** Or Mark it as "Solved" if issue got fixed.

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Ciao

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In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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Problem communicating via serial port in Linux

Hello,
I am trying to transfer data via serial port, in Linux.
But it is impossible till now!
I get Runtime exception.
Here is my code:
public class Main {
    public Main() {
    int num=5;
    int[] array = new int[5];
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                array[0]=1;
                array[1]=2;
                array[2]=3;
                array[3]=4;
                array[4]=5;
                new ParallelCommunication(num,array);
import java.io.*;
import java.util.*;
import javax.comm.*; // for SUN's serial/parallel port libraries
//import gnu.io.*; // for rxtxSerial library
public class ParallelCommunication implements Runnable, SerialPortEventListener {
   static CommPortIdentifier portId;
   static CommPortIdentifier saveportId;
   static Enumeration portList;
   InputStream inputStream;
   SerialPort serialPort;
   Thread readThread;
   static OutputStream outputStream;
   static boolean outputBufferEmptyFlag = false;
   int num;
   int[] array;
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      String osname = System.getProperty("os.name","").toLowerCase();
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      portList = CommPortIdentifier.getPortIdentifiers();
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            if (portId.getName().equals(defaultPort)) {
               System.out.println("Found port: "+defaultPort);
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         System.out.println("port " + defaultPort + " not found.");
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      // initwritetoport() assumes that the port has already been opened and
      //    initialized by "public void initialize()"
      try {
         // get the outputstream
         outputStream = serialPort.getOutputStream();
      } catch (IOException e) {}
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         serialPort.notifyOnOutputEmpty(true);
      } catch (Exception e) {
         System.out.println("Error setting event notification");
         System.out.println(e.toString());
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   public void writetoport(int counter) {
      try {
         // write string to serial port
         outputStream.write(String.valueOf(array[counter]).getBytes());
      } catch (IOException e) {}
   public void initialize() {
      // initalize serial port
      try {
         serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
      } catch (PortInUseException e) {System.out.println("Port In Use.");} //******Here is the Exception******
      try {
         inputStream = serialPort.getInputStream();
      } catch (IOException e) {}
      try {
         serialPort.addEventListener(this);
      } catch (TooManyListenersException e) {}
      // activate the DATA_AVAILABLE notifier
      serialPort.notifyOnDataAvailable(true);
      try {
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         serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
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                     SerialPort.PARITY_NONE);
      } catch (UnsupportedCommOperationException e) {}
      // start the read thread
      readThread = new Thread(this);
      readThread.start();
   public void run() {
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     for(int i=0; i<=num_of_inputs; i++) {
        // write string to port, the serialEvent will read it
        writetoport(i);
     serialPort.close();
   public void serialEvent(SerialPortEvent event) {
      switch (event.getEventType()) {
      case SerialPortEvent.BI:
      case SerialPortEvent.OE:
      case SerialPortEvent.FE:
      case SerialPortEvent.PE:
      case SerialPortEvent.CD:
      case SerialPortEvent.CTS:
      case SerialPortEvent.DSR:
      case SerialPortEvent.RI:
      case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
         break;
      case SerialPortEvent.DATA_AVAILABLE:
         // we get here if data has been received
         byte[] readBuffer = new byte[20];
         try {
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            String result = new String(readBuffer);
            System.out.println("Read: "+result);
         } catch (IOException e) {}
         break;
}...and the outcome is :
Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException:
Error opening "/dev/ttyS0"
tcgetattr(): Input/output error
at com.sun.comm.LinuxDriver.getCommPort(LinuxDriver.java:66)
at javax.comm.CommPortIdentifier.open(CommPortIdentifier.java:369)
at ParallelCommunication.initialize(ParallelCommunication.java:128)
I have searched a lot and I couldn't find a solution.
Thank you.

I'm having the same problem this helped somewhat debug the problem
http://bloggerdigest.blogspot.com/2006/11/linux-serial-com-port-diagnostic-test.html
I'm running Suse 10.3 and apparently it does not recognize my serial ports. So before
you can test your Java code you have to figure out how to make linux see the ports.
If I find a solution I'll let you know but if you find one first let me know. Thanks.

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Probably a BIOS bug.
Try contact MSI for on this issue and see if they could provide any fix.
>>How to contact MSI.<<

Communicating with Serial Port

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