Interfacing with Allen-Bradley Sensors

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Two questions about interfacing with the Allen-Bradley IR sensors:

1. How to hook it up: Are the outputs analog or digital (I'm guessing digital)? What are the output voltages of the green and white wires? If we assume that the output voltage is the same as the input voltage (12V) is it safe to hook it up to the robot controller?
2. How to read the outputs: Now supposing that we have managed to hook it up, what are the outputs of the green and white wires? On the specs, one wire is labeled as "N.O." and the other "N.C.", which we think means "normally open" and "normally closed." I would assume that one wire returns a 1 if the receiver has a signal, 0 if it doesn't, and vice versa for the other wire, but am not certain. We can't really test this ourselves without knowing the answers to question 1, "how to hook it up."

If anyone knows the answers or learns how to interface with the IR sensors through something I may have overlooked, please let me know. Thanks!