Tips and Tricks for Using the Jk721 Cutting Plotter with CorelDraw and CoCut Plugin

The sub port on your cutter is actually connected to a chipset that converts it to serial, so like rude dog said you would need those special drivers installed. The adapter you are using looks like a cheap one I had from China for an old printer, those have seldom worked with the plotters. The brand that has been shown to work consistently is the trip lite mentioned above

Cutting Plotter Jk721 Driver