TWN3 Multi125 - General RFID reader

So i have bought a TWN3 Multi125 - General to use it as an access reader to my room.

The only thing i need help with is how to make the arduino see the tag id so I know what tags that i need to give access.

Here is some links to the files that it is using:

Link to the zip archive www.elatec-rfid.com/uploads/files/TWN3DevPack439c_02.zip

Link to the download center http://www.elatec-rfid.com/en/download-center/

The program is using .c files. you can reprogram it for your own good but i would like to program it or the arduino so both of them communicate with each other.

Here is a youtube link if you need to see how it works. https://www.youtube.com/watch?v=OvQZmcsI0QE

Anyone out there that can help me?