Communication beteween 2 arduino, using protocol

Hi, firstly sorry for my english.

Good, I'm try to make a project with arduino, with refer in this topic:

http://forum.arduino.cc/index.php?topic=176142.0

Am using two arduino, but I am not getting following the example.

1 arduino uno how master and other how slave

Also using network interface RS485 MAX 485

Image
http://www.4shared.com/photo/bmk_lSOi/2013-09-04_084600.html

thank you