Hello David,
The Real Time Expressions View works with any PEMicro cable including OpenSDA interface.
The Live View feature is documented on pemicro PEMicro Blog
This view is not opened by default in the Debug perspective and you have to add it manually
Simply Go to menu Window -> "Show View" -> "Other..." and type "Real" into the filter field and select " Real Time Expressions"

The view should appear in the Debug perspective. Now if you add a variable and press "Resume" button (F8 key):

You should observe the variable is being updated.
If it does not work on your side please send us more details.
Thanks!
Stan