I tested the interface with my telescope, Webcam and EOS camera. Of course I do not take responsibility for any damage, which could result from the software or the hardware.
Interface - Commercial product
A similar interface is available from Shoestring Astronomy Store. The interface named GPINT-PT is tested with Guidemaster. The USB products from shoestringastronomy are supported. Also suitable interfaces are sold by Pierro Astro.
Interface - Do it yourself 