I believe if the ExtIO is enabled for transmitting you get a TX button in HDSDR
https://sites.google.com/site/g4zfqradio/hdsdr-iq-balance Q: TX doesn't work! How do I enable it? A: Yes, this can happen. We extended the ExtIO-DLL interface to allow RX/TX switching in HDSDR versions 2.13 and above. TX functionality requires support from your ExtIO-DLL. Without this ExtIO support, HDSDR cannot provide the TX function. You may be able to get TX support for HDSDR by contacting the manufacturer of your radio, or alternatively by contacting the developer of the ExtIO.
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