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CC3220SF-LAUNCHXL: CC3220SF-LAUNCH pad : how to use external UART ?

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Part Number: CC3220SF-LAUNCHXL

I'm trying to route CC3220 UART to that 20-pin connector, and use with external connection to PC.

Reading this launchpad guide,  per 2.5.7 I switched the jumpers, but , I cannot get anything through that connector - using the RX, TX lines.

Also, it seems the default app, pre-programmed , does not operate / start-up normally if those mentioned jumpers, are switched from Virtual COM to the 20-pin header. 

.. Why?  Any help whats missing?


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