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Chapter 3 171
Programming Examples
Using Java Programming Over Socket LAN
Using Java Programming Over Socket LAN
This is the Java programming example ScpiDemo.java that
demonstrates simple socket programming with Java. It is written in
Java programming language, and will compile with Java compilers
versions 1.0 and above.
import java.awt.*;
import java.io.*;
import java.net.*;
import java.applet.*;
// This is a SCPI Demo to demonstrate how one can communicate with the
// E4406A VSA with a JAVA capable browser. This is the
// Main class for the SCPI Demo. This applet will need Socks.class to
// support the I/O commands and a ScpiDemo.html for a browser to load
// the applet.
// To use this applet, either compile this applet with a Java compiler
// or use the existing compiled classes. copy ScpiDemo.class,
// Socks.class and ScpiDemo.html to a floppy. Insert the floppy into
// your instrument. Load up a browser on your computer and do the
// following:
// 1. Load this URL in your browser:
// ftp://<Your instrument’s IP address or name>/int/ScpiDemo.html
// 2. There should be two text windows show up in the browser:
// The top one is the SCPI response text area for any response
// coming back from the instrument. The bottom one is for you
// to enter a SCPI command. Type in a SCPI command and hit enter.
// If the command expects a response, it will show up in the top
// window.
public class ScpiDemo extends java.applet.Applet implements Runnable {
Thread responseThread;
Socks sck;
URL appletBase;
TextField scpiCommand = new TextField();
TextArea scpiResponse = new TextArea(10, 60);
Panel southPanel = new Panel();