Looks to me like the output may be 0 to 10V proportional to distance. I would put an o'scop or voltmeter across various pair of pins to find out.
Other than that, the datasheet is a little sparse. Maybe there is another one under "applications" on the site.
John
Edit: I have to be away for several hours tomorrow morning. If you haven't gotten the answer by the time I get back to Cleveland, I will give those rascals in Minnesota a call and find out what the connections are. BTW, what did you pay for the device?
John