Check your baud rate. ArtCut 2009 requires 9600, N, 8, 1 . Also, ensure the cutter is paused (light blinking usually means paused).
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If you only download the main program setup, you might find yourself missing the library of graphics that makes the software useful for quick sign-making. This is why finding a complete is preferable—it often contains the image libraries that allow you to utilize the full potential of the software. Check your baud rate