rgb strip with dmx

How can i control a rgb led strip with dmx ?

I have the strip pieces, each piece with 9 leds. I want to control all the strip pieces using open usb DMX. How can i do it ?

Take a look at these links if you have not seen them.

General info:
http://www.arduino.cc/playground/Learning/DMX

Specific info:
http://www.arduino.cc/playground/DMX/Opendmx