My Arduino Due Serial Monitor doesn't worke.

I cant use the Serial Monitor. Even with a simple code like this:

char val;
void setup()
{

pinMode(pn,OUTPUT);
Serial.Write(9600);
}
void loop;
{
if(val=='a')
{
do something;
}

if(val=='s')
{
do something else;
}

I open the Serial window,i put the values,pres Enter...And nothing happens..

can somebody help me?

Where is the code that didn't work?

Please post it between code tags...

Serial.Write(9600);

What is this? You nave not setup the serial port

You need

Serial.begin(9600);

in setup() followed by (for example)

Serial.println("Hello world");


Rob