In the patch window there are 4 columns, Pan/Tilt DMX Invert and Pan/Tilt Enc Invert (Encoder Invert).
The Encoder Invert swaps the direction of the encoder in the 3D view. in normal clockwise moves the value up. While invert, clockwise moves the value down.
One important thing to take note is that the values still do the same thing regardless of what mode you are in, it's just the direction of the encoder turns that gets inverted. So for example if the a value of 100 causes the lights to move downstage if the encoder is inverted or not a value of 100 will always move down stage.