Just answered my own question, it is via RS232 or IP =) also it was Lutron that wrote the module not Crestron..... although my rep specifically said Crestron wrote it? Hmmmm?

Anyway log into your RA2 dealer account and you will find the module under "drivers"

here is a copy of the FAQ's lutron gives with with the module. man i cannot wait to get my hands on prodigy =)

Where are the drivers available for download?
The drivers can be downloaded on the Lutron® resource website at [Link: ]
How do the two systems communicate with each other?
The drivers offer two-way functionality via Ethernet or RS232 integration
What functionality can I expect?
The drivers allow complete control and integration with RadioRA 2
How do I interface with Crestron Prodigy® and Adagio® home entertainment systems?
In order to integrate with any Crestron system, including Prodigy and Adagio systems, you must use the Crestron
SystemBuilderTM software.
What modules are included in the zip file?
•CoreModule
— Establishes the connection with the Main Repeater and manages all data flow
— Inputs and outputs are provided to interface to the other modules
— Can communicate via Ethernet or RS232
•EthernetrecommendedformostCrestron products
•RS232recommendedforProdigy systems
•FeedbackProcessingModule
— Reduces the amount of data that other modules will need to parse, making the overall program very efficient
•Simpl+® Module
— Used when programming with SIMPL+
•SIMPLWindowsTM Module
— Used when programming with SystemBuilder software
•MainRepeaterModules
— Allows control of the 100 possible scenes, LEDs, and monitoring contained on the Main Repeater
•Maestro® Dimmer Module
— Allows direct control and monitoring of any dimmer in the system
•KeypadModules
— Allows direct control and monitoring of any keypad button in the system including raise and lower, as well as
control of LEDs
•VisorControlReceiverModule
— Allows control of all buttons including contact closure inputs and outputs
•ShadeModule
— Allows direct control and monitoring of any shade in a RadioRA 2 system