Yes, only output PWM
Connect as PWM and set the Receiver to PWM in Hardware tab.
Disconnect board and remove all power
This is needed to apply all changes done in Hardware tab.
Connect again
Without any calibration you can monitor the receiver activity, go to the System tab and search for ReceiverActivity in UAVOBrowser:
Be sure the receiver is powered, this need external +5v
Moving a stick should display changes with Type: PWM and input number.