Welcome in the forum, Tim!
There was recently a similar complain with an UART problem, but that was related to USB-UART and could be targeted to bad receiving at the PC side.
Did you create a small project (just containing your UART) that produces the issue? Then use Creator->File->Create Workspace Bundle (minimal) and upload the resulting file here .
...and I just see, that the 500µs is the time, the UART needs to transmit your "Test\n\r"
Thank you for your response. It was discovered that the issue is related to the module going into deep sleep mode by
and related function calls as given in the document 'Getting Started With EZ-BLE PRoC Module (AN9681)', section '8.4.4 Main Loop and Low-Power Implementation'.
I am using the CYBLE-022001 UART to issue BLE commands similar to the way the Microchip RN4020 does.
Thank you Tim for keeping us informed!