java code to turn off the light and turn on
===

I need a little help with my code : 

import java.io.IOException;

import jd2xx.JD2XX;
 
 
public class Main {
	public static void main(String[] args) throws IOException {
 
		System.out.println("Made By Roman");
		
		// Create a JD2XX object
		JD2XX usb4Relay = new JD2XX();
 
		usb4Relay.open(0);
		usb4Relay.close();
	}
 
}

This code turn on the light ( and working great )
but my relay have 4 controlers and this code turn on all of tham
how to choose what control to turn on and 
how to turn off the light ?

thanks in advance.