U can get the same db9 adapter at jaycar. No electrical knowledge needed u just push the pins into the socket. You will need the color coded rj45 map and the u push the pins where u need them to go on the db9 socket.
http://www.jaycar.com.au/products_uploaded/PA0906.pdf
http://www.jaycar.com.au/productView.asp?ID=PA0906
If u want u can call me and il walk u through it. It's very easy. If I was local id do it for u.