Need help, Please!!!

By following the protocol, the Request should be built in 5 byte length, including 1 byte for changing Braud rate (Speed), and send request to a RS-232 port.

Protocol:

Request for the command processing, with optional extra byte for changing Baud Rate:

LGT :  length message   ( LGT = 5 )
TYPE     :    0x06
TO(time out):    0x0000 
CMD : (1 byte)       0x02 application update 
Baud Rate : (1 byte)   0xNN (optional parameter to change baud rate of the Mnt App)

where NN can be:
0x00 = No Baud Rate Change (similar to 4-byte command above)
0x09 = Change to 9600 Baud for Application Update speed
0x0A = Change to 19200 Baud for Application Update speed
0x0E = Change to 115200 Baud for Application Update speed
All other bytes are not accepted and will result in a status of 0x01.

I'm trying to test if my code works or not by creating another class (TestApplication.java) and pass the "3 differenr Baut rate" to this CPXAppliaction.

the 3 Baud Rate is supposed to input by reading a file.txt.

Question:

1. How do you think these code (first half)? please don't warry about the details about the "sending part". I mean, do I need setter/getter for the "speed" parameter pass?
2. I created the demo test class DemoApp.java (input speed by reading a txt file, and pass into CPXAppliaction). how do you think about that code?

Many thanks to you guys!!

public class CPXApplication extends CPXCommand {

   private int speed; .

    public CPXApplication() {
      speed = 9600;
         }

     public CPXApplication(int speedinit) {
      speed = speedinit; // TODO: where to get the speed?
       }

     protected void buildRequest() throws ElitePortException {
      String trans = "";

      // build the full-qualified message following the protocol

      trans = addToRequest(trans, (char) 0);
      trans = addToRequest(trans, (char) 5);
      trans = addToRequest(trans, (char) 6);
      trans = addToRequest(trans, (char) 0);
      trans = addToRequest(trans, (char) 0);
      trans = addToRequest(trans, (char) 2);

      switch (speed) {
      case 9600:
       trans = addToRequest(trans, (char) 0x09);
       break;

      case 19200:
       trans = addToRequest(trans, (char) 0x0A);
       break;

      case 115200:
       trans = addToRequest(trans, (char) 0x0E);
       break;

      default:
       // TODO: unexpected baud rate. throw();
       break;

      }

      trans = EncryptBinary(trans);

      trans = "F0." + trans;

      wrapRequest(trans); 

     }

     protected String addToRequest(String req, char c) {
        return req + c;
     }

     protected String addToRequest(String req, String s) {
        return req + s;
     }

     protected String addToRequest(String req) {
      return req;
     }

     public void analyzeResponse() {
      //..............

     }

    }

Here is the demo test code:

class Run {

   public static void run()
   {
           CPXAppliaction input = new CpXApplication();        

           int lineno = 0;

           try {
   FileReader fr = new FileReader("baudRateSpeed.txt");
   BufferedReader reader = new BufferedReader(fr);
   String line = reader.readLine();
   Scanner scan = null;
   while (line != null) {
   scan = new Scanner(line);
   String speed;

   speed = scan.next();


   if (lineno == 0)
   {
           input.speed = speed;

           lineno++;
   }

   else
   {
           input = cpxapplication(speed, input);
   }

   line = reader.readLine();

   }


   reader.close();

   }


   catch (FileNotFoundException e) {
           System.out.println("Could not find the file");
   }
   catch (IOException e) {
           System.out.println("Had a problem reading from file");
   }
}
   }


public class DemoApp{      
   public void main(String args[])
{
           run();

}