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
Download: https://shurll.com/2vGi9U
2ff7e9595c
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