No output to GCC Jaguar V

I have a GCC Jaguar V cutter and a PC running 64 bit Windows 10. GGC Great Cut outputs fine via COM 1. However I far prefer Inkscape to Illustrator so after a bit of a battle I managed to install Inkcut. Unfortunately after naming a new output device and checking that the Baud rate etc matched my cutter I loaded in an SVG file which appears in the window with the pen up movements showing and a simulated plot goes fine. Unfortunately when I select Device > Send to Device nothing happens. One strange thing in Inkcut is that although in Device > Setup I’ve called my cutter Jaguar V in the Monitor window it is New Device with no drop down list to choose from.
As a test I’ve also tried Extensions > Export > Plot in Inkscape but again the plotter doesn’t move.
Any suggestions are very welcome.