Serial port: from 6i without visa to 7express with visa ?????

upgrading from NT4 6i max 2.5 to 2000 7exp max3.1 my pzt on PC serial port do not move anymore. The DA converter do not understand the instructions.
Running max on the coms: done OK
Looping back the visa instructions: done instructions OK
Trying hyperterminal: done OK (the DAC move)
the coms are in function but the DAC do not move while driving with visa...any suggestion??

I also upgraded from LV6.1 to LV7 and use serial communication. I now use VISA (and prefer it). However, for the older functions.. they should work..
Have you looked into the VISA Advanced controls under Interface Specific and under "Serial". You may find the functions you need to "upgrade" your serial comm vi's.
-JLV-

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Below is the code I am using...
import java.io.*;
import java.util.*;
import javax.comm.*;
public class WriteReadEdit implements SerialPortEventListener {
CommPortIdentifier portId;
Enumeration portList;
OutputStream outputStream;
InputStream inputStream;
SerialPort serialPort;
public static void main(String[] args) {
          String command1 = "open\r";
          String command2 = "close\r";
          boolean EndCharacterQMark = false;
          WriteReadEdit readObject = new WriteReadEdit();
               readObject.Write(command1);
               try {
                    EndCharacterQMark = readObject.waitUntilDataComes();
                    System.out.println("EndCharacterQMark is: " + EndCharacterQMark);
               }     catch (IOException e) {}
                    if(EndCharacterQMark) {
                         EndCharacterQMark = false;
                         readObject.Write(command2);
                         try {
                              EndCharacterQMark = readObject.waitUntilDataComes();
                              System.out.println("EndCharacterQMark is: " + EndCharacterQMark);
                         }     catch (IOException e) {}
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synchronized boolean waitUntilDataComes() throws IOException {
     String total="";
     boolean EndCharQMark = false;
     StringBuffer inputBuffer = new StringBuffer();
     int newData = 0;
     while(true) {
                    if(!dataAvailable()) {
                         try {
                              wait();
                         }catch (InterruptedException e) {}
               try {
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                         newData = inputStream.read();
                         inputBuffer.append((char)newData);
               }          catch (IOException ex) {
                         System.err.println(ex);
                    String dataAtPort = inputBuffer.toString();
                    for(int i = 0; i < dataAtPort.length(); i++) {
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                              EndCharQMark = true;
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boolean dataAvailable() throws IOException {
     return inputStream.available() > 0;
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                    outputStream.write(command.getBytes());
                    System.out.println("\nSuccessfully Written: " + command);
          } catch (IOException e) {System.out.println("IO Exception Occured: " + e);
void closePort() {
     serialPort.close();
     System.out.println("Port closed successfully.");
// Constructor()
public WriteReadEdit() {
          portList = CommPortIdentifier.getPortIdentifiers();
          while (portList.hasMoreElements()) {
          portId = (CommPortIdentifier) portList.nextElement();
                    if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
          if (portId.getName().equals("COM1")) {
          try {
          serialPort = (SerialPort) portId.open("writereadobjectApp", 2000);
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          try {
               serialPort.setSerialPortParams(9600,
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                                        outputStream = serialPort.getOutputStream();
                                        inputStream = serialPort.getInputStream();
                                   } catch (IOException e) {
                                   try {
                                        serialPort.addEventListener(this);
                                   } catch (TooManyListenersException e) {}
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synchronized public void serialEvent(SerialPortEvent event) {
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     case SerialPortEvent.DATA_AVAILABLE:
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1. Usually there are buffers in the serial port controller. Apart from that, as long as the port is open, any data recieved will be added at the end of the InputStream of the comport so nothing will be lost.
2. Nope, see above. But there might just be some kind of limit there.
3. Download portmon http://www.sysinternals.com/ntw2k/freeware/portmon.shtml or any other prog that is able to monitor what's happening on you're serial port. This allows you to see if the response is really send by the robot.
You're code seem to me to be more complex then it needs to be. Check out javax.comm.CommPort.enableRecieveTimeout(int). Setting a timeout will cause the the read function to return when the timeout is passed or data is recieved. A timeout of of say 4sec whould make sure that when a reply is send, it is recieved and it's stops reading when it gets no reply.
In that case you could do with a sendMsg function wich dus not return until the correct response is recieved, or the timeout passed.
You migth consider putting all the communicatoin with the com port in a different Thread so the rest of the program runs on when that thread is listening to the port...
Hope this helps you a bit...

Serial port: from 6i without visa to 7express with visa ?????

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