This is the configuration I used to get FLRig working with the Xiegu G90 

Digirig cat plugged into radio head communications port.

Digirig audio plugged into radio ACC port.

COM Port in Device Manager is COM3 – Silicon Labs CP210x USB to UART. 

Using FLRig 2.0.0.5, select Xiegu G90
Goto Settings under config
Select Xcvr Tab:
COM port for USB/UART (COM3 from above)
Port Speed 19200
2 Stop Bits
No RTS/CTS
All RTS and CTS options deselected
On PTT-Generic Tab:
PTT CAT set to Both
RTS and CTS set to OFF
PTT control on Separate Serial Port set to NONE

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