Java comm problem

Question

hi,
i'm new to comm api,
i want to know how to communicate with modem using the comm api.
coz i have run following code.
used diff AT commands to set modem properties.
but
I could just see the DTR bit of modem set and TD and RD bit were set just a fraction of sec. and then the program went into loop.
but i couldn't read anything from the inputStream.
Can anyone help me out?
Following is the code i used and output i got.
import javax.comm.*;
import java.util.*;
import java.io.*;
import java.io.DataOutputStream;
public class TestCommPort implements SerialPortEventListener
CommPortIdentifier portId;
Enumeration portIds;
SerialPort serialPort;
DataOutputStream outputStream;
BufferedReader inputStream;
static String centralPagingNo="1234567";
public static void main(String arg[])
     TestCommPort testCommPort =new TestCommPort();
     testCommPort.portIds=CommPortIdentifier.getPortIdentifiers();
     while (testCommPort.portIds.hasMoreElements())
          testCommPort.portId=(CommPortIdentifier)testCommPort.portIds.nextElement();
          if(testCommPort.portId.getName().equals("COM2"))
          System.out.println(testCommPort .portId.getName());
          try {
          testCommPort.serialPort = (SerialPort) testCommPort.portId.open("TestCommPort", 2000);
                    try{
                         testCommPort.serialPort.addEventListener(testCommPort);
               catch(java.util.TooManyListenersException tme){System.out.println(tme.getMessage());}
     catch (PortInUseException e) {System.out.println(e.getMessage());}
          try {
                    testCommPort.outputStream = new DataOutputStream(testCommPort.serialPort.getOutputStream());
                    testCommPort.inputStream = new BufferedReader(new InputStreamReader(testCommPort.serialPort.getInputStream()));
          catch (IOException e) {}
     try {
               if(testCommPort.serialPort.isDSR()==true)
               System.out.println("the dsr bit is set");
               if(testCommPort.serialPort.isRTS()==true)
               System.out.println("the rts bit is set");
               if(testCommPort.serialPort.isCD()==true)
               System.out.println("the cd bit is set");
               else
               System.out.println("the cd bit is not set");
               if(testCommPort.serialPort.isCTS()==true)
               System.out.println("the cts bit is set");
               try {
                    testCommPort.serialPort.setSerialPortParams(15200,
                    SerialPort.DATABITS_8,
                    SerialPort.STOPBITS_1,
                    SerialPort.PARITY_NONE);
                    } catch (UnsupportedCommOperationException e) {}
               try {
                    testCommPort.outputStream.writeChars("AT");
                    System.out.println("initializing modem");
                    testCommPort.outputStream.writeChars("ATQ0 <CR>");
                    testCommPort.outputStream.writeChars("ATM1 <CR>");
                    testCommPort.outputStream.writeChars("ATL2 <cr>");
                    testCommPort.outputStream.writeChars("ATV1 <cr>");
                    System.out.println("result code format option set to Verbose mode");
                    testCommPort.outputStream.writeChars("ATSr? <cr>");
                    System.out.println("reading sr registers");
                    System.out.println(testCommPort.inputStream.readLine());
                    testCommPort.outputStream.writeChars("ATI4 <CR>");
                    System.out.println(testCommPort.inputStream.readLine());
                    testCommPort.outputStream.writeChars("ATX4 <CR> ");
                    testCommPort.outputStream.writeChars("ATE1 <CR>");
                    testCommPort.outputStream.writeChars("ATDT 8655979; <CR>");
                    System.out.println(testCommPort.inputStream.readLine());
          } catch (IOException e) {}
     } catch (Exception e){System.out.println(e.getMessage());}
     public void serialEvent(SerialPortEvent se)
          if(se.getEventType()==SerialPortEvent.DSR)
          System.out.println("the data set is ready");
and the output is:
COM2
the dsr bit is set
the rts bit is set
the cd bit is not set
the cts bit is set
initializing modem
result code format option set to Verbose mode
reading sr registers

Answer 1

I was also getting strange results in a similar scenario.
I was using "AT\n" and getting strange results. The above solution, using "AT\r\n" fixed everything.
Just wanted to pass that along.
Thanks for the info.