Thread: Controlling an external motor controller

Hi, I recently have started experimenting with motorcontrollers, specially ones that control servo motors. I wanted to use Java because I am most familiar with this language, and I am learning javax.comm. However, I am clueless when it comes to giving the motorcontroller actual commands to carry out, I can't seem to figure out how to do this. I'd imagine that different motorcontrollers might have different commands that are applicable to them. I am using the EZ4AXIS model by All motion (http://www.allmotion.com/EZ4AXISdescription.htm). This is what I have so far:

package LBIC;
import javax.comm.*;
 
import java.io.*;
import java.util.*;
public class comm implements SerialPortEventListener, CommPortOwnershipListener {
	public static SerialPort sPort;
	public static void main (String args[])
	{
		try {
			CommPortIdentifier com = CommPortIdentifier.getPortIdentifier("COM4");
			System.out.println(com);
			System.out.println(com.getName());
			try {
				sPort = (SerialPort)com.open("COMM", 1000);
				try {
					OutputStream os = sPort.getOutputStream();
				} catch (IOException e) {
					sPort.close();
					e.printStackTrace();
				}
				try {
					InputStream is = sPort.getInputStream();
				} catch (IOException e) {
					sPort.close();
					e.printStackTrace();
				}
				try {
					sPort.addEventListener(this);
				} catch (TooManyListenersException e) {
					sPort.close();
					e.printStackTrace();
				}
				com.addPortOwnershipListener(this);	
			} catch (PortInUseException e) {
				e.printStackTrace();
			}
		} catch (NoSuchPortException e) {
			e.printStackTrace();
		}
	}
	@Override
	public void serialEvent(SerialPortEvent arg0) {
		// TODO Auto-generated method stub
 
	}
 
	@Override
	public void ownershipChange(int arg0) {
		// TODO Auto-generated method stub
 
	}
}

Any help would be greatly appreciated.