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Index › Programming Questions & Help › Electronics,  Serial Library › communicating PC to PC using the Serial Port
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communicating PC to PC using the Serial Port (Read 2325 times)
jtang
communicating PC to PC using the Serial Port
Dec 3rd, 2009, 9:36pm  
Is it possible to communicate using the serial port between two computers?

I've written a simple read and write program and had one computer write to the port of the other computer and the second computer read the data. But after working at it, I haven't gotten the two PC's to talk to each other. I just get the -1 value that means there is nothing to read from the port. (I'm using a USB to Serial cable and hooking up to the Serial (D9) of another computer)

Today, I found out about the SerialEvent() function. But I dont think its getting called. Any help on this would be great!
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jtang
Re: communicating PC to PC using the Serial Port
Reply #1 - Dec 3rd, 2009, 10:10pm  
heres my code:
//testing reading from a serial port

import processing.serial.*;
int val = 0;
Serial myPort;

void setup(){
 size(200,200);
 
 println(Serial.list());
 myPort = new Serial(this,"COM7",9600);
 
}

void draw(){
 background(val);
 
 
}

void SerialEvent(Serial myPort){
  val = myPort.read();
 println("Raw Input: "+val);
}
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jtang
Re: communicating PC to PC using the Serial Port
Reply #2 - Dec 3rd, 2009, 10:13pm  
//testing writing to the serial port

import processing.serial.*;
int val = 0;
Serial myPort;

void setup(){
 size(200,200);
 
 println(Serial.list());
 myPort = new Serial(this, "COM7", 9600);
 myPort.write(65);
}

void draw(){
 
 background(val);
 //val = myPort.read();
 println(val);
}

void SerialEvent(Serial myPort){
 val = myPort.read();
 println("Raw Input: " + val);
 println(val);
 
}
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Cedric
Re: communicating PC to PC using the Serial Port
Reply #3 - Dec 3rd, 2009, 10:14pm  
Do you want to connect two computers? or is it about the serial connection that is important ?

cause if not. There is a a nice processing example in your sketch folder.
its called sharedCanvasServer / client
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jtang
Re: communicating PC to PC using the Serial Port
Reply #4 - Jan 14th, 2010, 10:34pm  
The Serial connection is important. I'm trying to get the two to talk so I can demonstrate to my professor that it can communicate to something other than the microcontroller. Basically that my programs run independent with any RS-232 data.
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