Hey Darrel,

It's not so much of a complaint as an observation....

I don't come on here expecting it to be fixed.... but seek advice from those more knowledgable as to where I should be looking in a bid to resolve the issue. I could post the PC exe up, but can't see how that would help as I don't have the source files that it was compiled from. I don't know enough about USB communications to deduce why the PC / PIC can communicate in one direction only without reporting an error. Hence the post. I've only been working on this over the past couple of weeks - The code was written by a 3rd party using 2.60 and used different hardware, albeit from the same family, so can't see why it is only working the way it is.

Malcolm