Have you seen this article?
http://hdsdr.de/Elecraft-KX3_with_HDSDR.pdfThe Omni-rig allows the HDSDR to change the frequency and or mode of the KX3 and vice versa. It uses a com port to do that, so you can use the USB to serial adapted that Elecraft supply.
73 from David GM4JJJ
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