Just to close out this topic and perhaps save a future ham some frustration, the solution for me turned out to be:
rigctld-wsjtx -m 2004 -r /dev/ttyUSB0 -s 9600 -P GPION -p 17 using the negated strobe. Thanks for the help, Bill - you put me onto the path of righteousness. Rgds - Mark/K4LFL
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