Since I'm having trouble getting one of these cables (wink), I did some GOOGLE searches and found this video of a guy who built another Computer controlled USB cable switch for Nikon. https://www.youtube.com/watch?v=efK1RCPaSoY I've order the parts today off of EBAY and will post back when I get it hooked up and working.  This way you are reliant on EBAY supplier and a little bit of work yourself.