Can you identify this?!

Hello,

Thank you for taking your time to read my post. Now to the point, i need some help figuring out what this guy is and how i can replicate it. Any information would be appericated and anyone who goes over and beyond, your effort will be rewarded. (as long as you have paypal!) This is used to connect a laptop to a small device to read serial I/O. its a db-25 that plugs into a laptop and it has 4 lines. not sure what they all do. Thank you

http://uk.mouser.com/Search/Refine.aspx?Keyword=580-LME0505D

DC-DC Convertor, Temp Sensor and Digital Isolator.