How I test with RealTerm Serial Capture 

RealTerm Notes
Port Tab:
Baud should be at 921600
Port should be the COM port used by the Silicon Labs Driver.
Send Tab:
In the first text field type the letter "Q".
Click on "Send ASCII"
The response should be the letter Q.
That response means that the pressure board is working.
No response means that the pressure board is not working.