from what I can tell the serail link on the Power55 is just a 3.5mm sterio jack pinned out for serial use. The same for the Ex-Link on the samsung monitor. So it would be just a 3.5mm sterio cable male to male. How ever I do not beleave that the serial control values are going to match up. If you are looking for a Db9 serail male to 3.5mm male cable you can do a search for "RapidRun RS-232 Adapter" that should be a good cable to go from the Ex-Link to a computer and I would be willing to bet the same type of cable could be used to go from the Power55 to a computer. The serial connection for the Ex-Link sould be 9600,8,n,1 not sure for the Power55 but these setting are used for many different connection. I hope this help some
I am about to get a samsung un55c8000 and looking at a motorized mount but will most likely have to build my own. or build an interface to go between the tv and the mount to translate the commands.