I just got a FX4-CR V.3 (latest with USB-C) and trying to get rig control working. The radio manual says to use the Kenwood 590S and the settings are 115,200, 8/2/none and RTS-ON. When I do that in USB mode (or any mode) the radio will transmit and not unkey until I've turned RTS=OFF. Another thing when I went to reinitialize it does at times read the frequency even though in transmit mode.
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I know this is not a popular radio, but I've sort of run out of ideas. Here's a screenshot of the settings:
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73 Scott
KN3A
