Problem with DMX in Arduino PCB

hi arduino friends!
i have arduino MEGA version PCB.
i try to compile&upload the dmx code.
but i don't know.
which pin is output.
anyone can tell me.
how to connect.
how can fix it .
thank you any help.
thank!

i try to compile&upload the dmx code.

What dmx code?

i upload this code
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1205193597
but the pin 8 no output

/* CONSTANTS */

//#define debug                // use this to send feedback to the serial monitor
#define ledPin 13              // LED built into Arduino Duemilanove platine
#define sig 11                 // DMX signal output pin

Is the output on pin 11?

Yes,the pin 11 have output
thank you for you help!
thank you!