simon.ben@free.fr

I'm wondering if anyone had already tried to communicate via ethernet with a panasonic projector. It works fine on a web browser but I'd like to do it in max.

http://pjlink.jbmia.or.jp/english/index.html)

After several tried with the mxj net.tcp.send object, I didn't succeed. Each time I'm sending something in it, it returns the message via the failure outlet.

I'm wondering if anyone had already tried to communicate via ethernet with a panasonic projector. It works fine on a web browser but I'd like to do it in max.
It uses the "pjlink" protocol. (http://pjlink.jbmia.or.jp/english/index.html)
It's uses TCP on port 4352.
After several tried with the mxj net.tcp.send object, I didn't succeed. Each time I'm sending something in it, it returns the message via the failure outlet.
Can anyone help me?

pjlink-communication-videoprojector-panasonic-tcp

I dont think you can send raw data with net.tcp.send. It probably 

sends atoms, which of course the projector will not understand. You 

would need to make a custom mxj object that communicates with the 

projector using whatever protocol it expects. There is a lot of stuff 

about java client/server socket programming on the internet so it 

On Sep 20, 2008, at 06:05 AM, benoit simon wrote:

> I'm wondering if anyone had already tried to communicate via 

> ethernet with a panasonic projector. It works fine on a web browser 

> After several tried with the mxj net.tcp.send object, I didn't 

> succeed. Each time I'm sending something in it, it returns the 

I dont think you can send raw data with net.tcp.send. It probably  
sends atoms, which of course the projector will not understand. You  
would need to make a custom mxj object that communicates with the  
projector using whatever protocol it expects. There is a lot of stuff  
about java client/server socket programming on the internet so it  
shouldnt be too difficult.
t

>
> Hi,
>
> I'm wondering if anyone had already tried to communicate via  
> ethernet with a panasonic projector. It works fine on a web browser  
> but I'd like to do it in max.
> It uses the "pjlink" protocol. (http://pjlink.jbmia.or.jp/english/ 
> index.html)
> It's uses TCP on port 4352.
> After several tried with the mxj net.tcp.send object, I didn't  
> succeed. Each time I'm sending something in it, it returns the  
> message via the failure outlet.
> Can anyone help me?
>
> Regards.
>
> Benoit SIMON.


Here is what I just made in JAVA at the Danish National Gallery.

I made a java package called pjLink. Within this package i made following 2 classes. When execute as compiled it tells how to use it.

* Remember to update line "pjLinkSocket = new Socket("172.20.X.X", 4352);" with the correct IP-Address

* Only works on Projector without Password. Haven't implemented the md5 authentication.

package pjLink;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

import pjLink.Projector.*;

/**
 * @author Nicolai Bob Zachariassen
 * @year 2009
 * Application to turn power on / off of a projector using PJLink protocol
 */
public class PjLinkCom {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Projector projector = new Projector();

        for (String s: args) {
            // Turn power on
            if (s.equals("on") && projector.POWR == PowerState.undefined){
                projector.POWR = PowerState.on;
                System.out.println("Turning Power On");
            }

            // Turn power off
            if (s.equals("off") && projector.POWR == PowerState.undefined){
                projector.POWR = PowerState.off;
                System.out.println("Turning Power Off");
            }

            // Switch Input to: rgb1
            if (s.equals("rgb1") && projector.INPT == InputState.undefined){
                projector.INPT = InputState.rgb1;
                System.out.println("Switching Input to RGB1");
            }
            // Switch Input to: rgb2
            if (s.equals("rgb2") && projector.INPT == InputState.undefined){
                projector.INPT = InputState.rgb1;
                System.out.println("Switching Input to RGB2");
            }
            // Switch Input to: video
            if (s.equals("video") && projector.INPT == InputState.undefined){
                projector.INPT = InputState.rgb1;
                System.out.println("Switching Input to VIDEO");
            }
            // Switch Input to: svideo
            if (s.equals("svideo") && projector.INPT == InputState.undefined){
                projector.INPT = InputState.rgb1;
                System.out.println("Switching Input to S-VIDEO");
            }
            // Switch Input to: dvi
            if (s.equals("dvi") && projector.INPT == InputState.undefined){
                projector.INPT = InputState.rgb1;
                System.out.println("Switching Input to DVI-D");
            }
        }

        Socket pjLinkSocket;
        try {
            System.out.println("Opening connection");
            pjLinkSocket = new Socket("172.20.X.X", 4352);

            DataOutputStream ostream = new DataOutputStream(pjLinkSocket.getOutputStream());
            BufferedReader istream = new BufferedReader(new InputStreamReader(pjLinkSocket.getInputStream()));            

            System.out.println(istream.readLine());

            if (projector.INPT == InputState.undefined && projector.POWR == PowerState.undefined){
                System.out.println("nnSyntax:n");
                System.out.println("tTurn on/off projector: java pjLink.PjLinkCom on|off");
                System.out.println("tSwitch input on projector: java pjLink.PjLinkCom rgb1|rgb2|video|svideo|dvi");
                System.out.println("ntExample: java pjLink.PjLinkCom on rgb2");
            }

            if (projector.INPT == InputState.undefined){
                ostream.writeBytes("%1INPT ?r");
                System.out.println(istream.readLine());
            }else if (projector.INPT == InputState.rgb1){
                ostream.writeBytes("%1INPT 11r");
            }else if (projector.INPT == InputState.rgb2){
                ostream.writeBytes("%1INPT 12r");
            }else if (projector.INPT == InputState.video){
                ostream.writeBytes("%1INPT 21r");
            }else if (projector.INPT == InputState.svideo){
                ostream.writeBytes("%1INPT 22r");
            }else if (projector.INPT == InputState.dvi){
                ostream.writeBytes("%1INPT 31r");
            }

            if (projector.POWR == PowerState.undefined){
                ostream.writeBytes("%1POWR ?r");
                System.out.println(istream.readLine());
            }else if (projector.POWR == PowerState.on){
                ostream.writeBytes("%1POWR 1r");
            }else if (projector.POWR == PowerState.off){
                ostream.writeBytes("%1POWR 0r");
            }

            ostream.close();
            istream.close();
            pjLinkSocket.close();

        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}


package pjLink;

public class Projector {
    protected enum PowerState{
        on, off, undefined
    }
    protected enum InputState{
        rgb1, rgb2, video, svideo, dvi, undefined
    }
    protected PowerState POWR;
    protected InputState INPT;

    Projector(){
        POWR = PowerState.undefined;
        INPT = InputState.undefined;
    }

}


Here is what I just made in JAVA at the Danish National Gallery. 

* Remember to update line "pjLinkSocket = new Socket("172.20.X.X", 4352);" with the correct IP-Address
* Only works on Projector without Password. Haven't implemented the md5 authentication.

package pjLink;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

import pjLink.Projector.*;

/**
 * @author Nicolai Bob Zachariassen
 * @year 2009
 * Application to turn power on / off of a projector using PJLink protocol
 */
public class PjLinkCom {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Projector projector = new Projector();

		for (String s: args) {
			// Turn power on
			if (s.equals("on") && projector.POWR == PowerState.undefined){
				projector.POWR = PowerState.on;
				System.out.println("Turning Power On");
			}

			// Turn power off
			if (s.equals("off") && projector.POWR == PowerState.undefined){
				projector.POWR = PowerState.off;
				System.out.println("Turning Power Off");
			}

			// Switch Input to: rgb1
			if (s.equals("rgb1") && projector.INPT == InputState.undefined){
				projector.INPT = InputState.rgb1;
				System.out.println("Switching Input to RGB1");
			}
			// Switch Input to: rgb2
			if (s.equals("rgb2") && projector.INPT == InputState.undefined){
				projector.INPT = InputState.rgb1;
				System.out.println("Switching Input to RGB2");
			}
			// Switch Input to: video
			if (s.equals("video") && projector.INPT == InputState.undefined){
				projector.INPT = InputState.rgb1;
				System.out.println("Switching Input to VIDEO");
			}
			// Switch Input to: svideo
			if (s.equals("svideo") && projector.INPT == InputState.undefined){
				projector.INPT = InputState.rgb1;
				System.out.println("Switching Input to S-VIDEO");
			}
			// Switch Input to: dvi
			if (s.equals("dvi") && projector.INPT == InputState.undefined){
				projector.INPT = InputState.rgb1;
				System.out.println("Switching Input to DVI-D");
			}
        }

		Socket pjLinkSocket;
		try {
			System.out.println("Opening connection");
			pjLinkSocket = new Socket("172.20.X.X", 4352);

            DataOutputStream ostream = new DataOutputStream(pjLinkSocket.getOutputStream());
	        BufferedReader istream = new BufferedReader(new InputStreamReader(pjLinkSocket.getInputStream()));			

	        System.out.println(istream.readLine());

	        if (projector.INPT == InputState.undefined && projector.POWR == PowerState.undefined){
    	        System.out.println("nnSyntax:n");
    	        System.out.println("tTurn on/off projector: java pjLink.PjLinkCom on|off");
    	        System.out.println("tSwitch input on projector: java pjLink.PjLinkCom rgb1|rgb2|video|svideo|dvi");
    	        System.out.println("ntExample: java pjLink.PjLinkCom on rgb2");
    		}

    		if (projector.INPT == InputState.undefined){
    	        ostream.writeBytes("%1INPT ?r");
    	        System.out.println(istream.readLine());
    		}else if (projector.INPT == InputState.rgb1){
	        	ostream.writeBytes("%1INPT 11r");
    		}else if (projector.INPT == InputState.rgb2){
	        	ostream.writeBytes("%1INPT 12r");
    		}else if (projector.INPT == InputState.video){
	        	ostream.writeBytes("%1INPT 21r");
    		}else if (projector.INPT == InputState.svideo){
	        	ostream.writeBytes("%1INPT 22r");
    		}else if (projector.INPT == InputState.dvi){
	        	ostream.writeBytes("%1INPT 31r");
    		}

    		if (projector.POWR == PowerState.undefined){
    	        ostream.writeBytes("%1POWR ?r");
    	        System.out.println(istream.readLine());
    		}else if (projector.POWR == PowerState.on){
    	        ostream.writeBytes("%1POWR 1r");
    		}else if (projector.POWR == PowerState.off){
    	        ostream.writeBytes("%1POWR 0r");
    		}

            ostream.close();
            istream.close();
            pjLinkSocket.close();

		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}


package pjLink;

public class Projector {
	protected enum PowerState{
		on, off, undefined
	}
	protected enum InputState{
		rgb1, rgb2, video, svideo, dvi, undefined
	}
	protected PowerState POWR;
	protected InputState INPT;

	Projector(){
		POWR = PowerState.undefined;
		INPT = InputState.undefined;
	}

}


Sorry for the late reply, but I just took the time to look at your job.

Have you already try your classes in max?

There are missing lines before compiling:

public class PjLinkCom extends MaxObject{

The compiling was successful after adding these but the "mxj pjLink.PjLinkCom" object doesn't understand rgb1 or another strings...

If you will have few time to give me some advices, I would appreciate.

Sorry for the late reply, but I just took the time to look at your job.
Have you already try your classes in max?
I haven't succeed to work with.
There are missing lines before compiling:

Nicolai's code will additional need some small changes to run under mxj as well as extending MaxObject:

main() needs to be changed to a method that will take input from the max environment. Given the way the code is written, the quickest way to do this would be to change it to a handler for a list of symbol atoms.

Nicolai's code will additional need some small changes to run under mxj as well as extending MaxObject: 

main() needs to be changed to a method that will take input from the max environment. Given the way the code is written, the quickest way to do this would be to change it to a handler for a list of symbol atoms. 

I searched the forums today for PJ LINK, since I am also wanting to control a Panasonic projector from Max… this thread is a year old, but I was wondering if anyone had any further success, using the java code or otherwise? The command structure itself is more like a serial string then anything else. I just wish the serial object had an option to send over a tcp connection :)

I searched the forums today for PJ LINK, since I am also wanting to control a Panasonic projector from Max… this thread is a year old, but I was wondering if anyone had any further success, using the java code or otherwise?  The command structure itself is more like a serial string then anything else.  I just wish the serial object had an option to send over a tcp connection  :)

PS I'm fairly java illiterate -- could someone take a whack at converting the javacode earlier in the thread to mxj?

I am all setup to test it here with the projector on the network. The only functionality I am really after is turning the power on and off.

PS  I'm fairly java illiterate --  could someone take a whack at converting the javacode earlier in the thread to mxj?  

I am all setup to test it here with the projector on the network.  The only functionality I am really after is turning the power on and off.  

More on this saga, I put this on the back burner some time ago, using an rs-232 implementation instead for that particular project, but now I am about to add more projectors for a new project, and need to revisit PJLINK.

Today I found some new GPL java pjlink code, haven't had a chance to try it yet in max... but anyone care to take a look at compatibility / portability?

    public void PjlinkSetting(String projectorIp,String ProjectorPw){

        this.sendRecvData(new JLinkDataSend("POWR","1"));

        this.sendRecvData(new JLinkDataSend("POWR","0"));

        JLinkDataRecv recv=this.sendRecvData(new JLinkDataSend("LAMP","?"));

        if(recv==null){System.out.println("recv null");return null;}

        if(recv.arg==null){System.out.println("arg null");return null;}

        String[] lamphours=recv.arg.split(" ");

        System.out.println("lamp testing");

        return "Total lamp hours: "+ lamphours[0];

        JLinkDataRecv recv=this.sendRecvData(new JLinkDataSend("NAME","?"));

        if(recv==null)return null;

    private String readSocketData(BufferedReader in){

            return in.readLine();

            System.out.println("Read failed");

    private JLinkDataRecv sendRecvData(JLinkDataSend dataOut){

        JLinkDataRecv recvd=null;

            PJsock=new Socket();

            PJsock.bind(null);

            PJsock.connect(new InetSocketAddress(IP,4352), 2000);

            out = new PrintWriter(PJsock.getOutputStream(),true);

         in = new BufferedReader(new InputStreamReader(PJsock.getInputStream()));

        } catch (UnknownHostException e) {

     System.out.println("Unknown host: "+IP);

     System.out.println("Cannot connect to ip: "+IP);

     Data=readSocketData(in).split(" ");

         System.out.println("projector did not send out magic PJLINK");

         if(Data[1].equals("1")){

             System.out.println("projector uses secured link");

             String secureComp= new String(Data[2]+this.Password);

                 MessageDigest md5 = MessageDigest.getInstance("MD5");

                 md5.reset();

                 md5.update(secureComp.getBytes());

                 byte[] digested=md5.digest();

                 String tmp = "";

                 String res = "";

                 for (int i = 0; i < digested.length; i++) {

                     tmp = (Integer.toHexString(0xFF & digested[i]));

                     if (tmp.length() == 1) {

                         res += "0" + tmp;

                     } else {

                         res += tmp;

                     }

                    System.out.println("adding secured MD5 digest: "+res);

                    dataOut.AddSecurityData(res);

             }catch(NoSuchAlgorithmException nsae){

                 System.out.println("could not find MD5 digest");

         System.out.println("sending to beamer: "+dataOut.outData);

         out.write(dataOut.outData.toCharArray());

            //Receive text from server

         String dataIn=readSocketData(in);

         System.out.println("received from beamer: "+dataIn);

             recvd=new JLinkDataRecv(dataIn);

             System.out.println("received a NULL string from beamer!");

        System.out.println("closing socket");

        } catch (IOException e) {

            System.out.println("failure on socket close");

            e.printStackTrace();

        public JLinkDataRecv(String data){

            cmd=data.substring(2,4);

            arg=data.substring(7);

        public JLinkDataSend(String cmd,String arg){

            outData="%1"+cmd+" "+arg;

        public void AddSecurityData(String addData){

            outData=addData+outData;

import java.net.*;
import java.security.*;
//import java.util.*;
import java.io.*;
//import java.lang.*;

public class PjlinkApp {
	private String IP;
	private String Password;

	public void PjlinkSetting(String projectorIp,String ProjectorPw){
		IP=projectorIp;
		Password=ProjectorPw;
	}

	public void projectorOn(){
		this.sendRecvData(new JLinkDataSend("POWR","1"));
	}

	public void projectorOff(){
		this.sendRecvData(new JLinkDataSend("POWR","0"));
	}

	public String projectorHours(){
		JLinkDataRecv recv=this.sendRecvData(new JLinkDataSend("LAMP","?"));
		if(recv==null){System.out.println("recv null");return null;}
		if(recv.arg==null){System.out.println("arg null");return null;}
		String[] lamphours=recv.arg.split(" ");

		System.out.println("lamp testing");
		return "Total lamp hours: "+ lamphours[0];
	}

	public String projectorName(){
		JLinkDataRecv recv=this.sendRecvData(new JLinkDataSend("NAME","?"));
		if(recv==null)return null;
		return recv.arg;
	}

	private String readSocketData(BufferedReader in){
		try{
			return in.readLine();
		} catch (IOException e){
			System.out.println("Read failed");
		    System.exit(1);
		}
		return null;
	}

	private JLinkDataRecv sendRecvData(JLinkDataSend dataOut){
		PrintWriter out=null;
		BufferedReader in=null;
		Socket PJsock = null;
		JLinkDataRecv recvd=null;
		String[] Data=null;

		try{
			PJsock=new Socket();
			PJsock.bind(null);
			PJsock.connect(new InetSocketAddress(IP,4352), 2000);
			out = new PrintWriter(PJsock.getOutputStream(),true);
		    in = new BufferedReader(new InputStreamReader(PJsock.getInputStream()));
		} catch (UnknownHostException e) {
	     System.out.println("Unknown host: "+IP);
	     return null;
	   } catch  (IOException e) {
	     System.out.println("Cannot connect to ip: "+IP);
	     return null;
	   }

	   Data=readSocketData(in).split(" ");
	   if(!Data[0].equals("PJLINK")){
		   System.out.println("projector did not send out magic PJLINK");
	   }else{
		   if(Data[1].equals("1")){
			   System.out.println("projector uses secured link");
			   String secureComp= new String(Data[2]+this.Password);
			   try{
				   MessageDigest md5 = MessageDigest.getInstance("MD5");
				   md5.reset();
				   md5.update(secureComp.getBytes());
				   byte[] digested=md5.digest();
				   String tmp = "";
				   String res = "";

				   for (int i = 0; i < digested.length; i++) {
					   tmp = (Integer.toHexString(0xFF & digested[i]));
					   if (tmp.length() == 1) {
						   res += "0" + tmp;
					   } else {
						   res += tmp;
					   }
				   }
					System.out.println("adding secured MD5 digest: "+res);
					dataOut.AddSecurityData(res);
			   }catch(NoSuchAlgorithmException nsae){
				   System.out.println("could not find MD5 digest");
			   }

		   }
		   System.out.println("sending to beamer: "+dataOut.outData);
		   out.write(dataOut.outData.toCharArray());
		   out.write(0x0d);
		   out.flush();
			//Receive text from server
		   String dataIn=readSocketData(in);
		   System.out.println("received from beamer: "+dataIn);
		   if(dataIn!=null){
			   recvd=new JLinkDataRecv(dataIn);
		   }else{
			   System.out.println("received a NULL string from beamer!");
		   }

	   }
		System.out.println("closing socket");
		try {
			PJsock.close();
		} catch (IOException e) {
			System.out.println("failure on socket close");
			e.printStackTrace();
		}
		return recvd;
	}		

	class JLinkDataRecv{
		public String cmd;
		public String arg;
		public JLinkDataRecv(String data){
			cmd=data.substring(2,4);
			arg=data.substring(7);
		}
	}
	class JLinkDataSend{
		public String outData;
		public JLinkDataSend(String cmd,String arg){
			outData="%1"+cmd+" "+arg;
		}
		public void AddSecurityData(String addData){
			outData=addData+outData;
		}
	}

You can use standard mxj net.tcp.send object to remote Panasonic Videoprojectors with PJLink protocol.

Here is a simple patch which open and close the shutter…

the thread is old, but it is exactly about what I am looking for help for. Did anybody succeed in controlling a projector with PJLink and max? Anybody can confirm Reno's method does work? I tried with it, but with no luck.

pjlink communication videoprojector panasonic tcp