I have a NexStar 80SLT - apparently it is possible to use this hand controller to connect to the NexSXW if the right firmware is updated to it.
http://www.nexstarsite.com/OddsNEnds...4Available.htm
The NexSXD site says that firmware 4.16 GEM is needed - can you tell me what version firmware is on your hand controller? The latest for GEM is 4.20
-John