Generally the Com 1 is reserved for an actual Serial connection. If you are using a USB Cable please check to be sure you have installed the USB drivers that came with your plotter. If you have you should find another com port available in the device pull down - usually com3 or com 4, That can be confirmed by navigating to the windows device manager
Right Click on My Computer Choose Properties Click the hardware tab Click Device Manager Look for ports Click the plus sign next to ports Find a port labeled USB/Serial
One you have found the correct port number go back to SignCut and choose that in device manager.
If this does not help please let us know what ports you find in device manager.
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