Arduino and pyranometer (SP Lite 2) reading

Hello guys, I'm new to arduino developing. I will create soon a project that reads from this pyranometer sensor "http://www.kippzonen.com/Product/9/SP-Lite2-Pyranometer#.WeUlx2hSyMo". The SP Lite 2.

And I can not read the Solar Irradiance. Andy of you know how to connect the wires and make the code?

Wires:
Red +
Blue -
Black Ground