Arduino and IR reflector

Hi,
I am going to test my new reflector:
http://www.robotshop.us/inex-infrared-reflective-sensor-TCR-4.html
with Arduino, but the thing is that, I can't find out which output of the sensor is ground, data and 5v!
It must be written on the sensor board, but it is not. On one site I read that the middle output is data, but how to be sure? I didn't find out by the data sheet!
Help please!

I didn't find out by the data sheet!

Post the link to the data sheet and let me try to find t.

Actually the problem is now solved. I found a pdf when googling this TCRT5000L, and found someone used it for line tracker robot. There was a simple explanation :wink:

anyway thank you )