Hi Pete,
Did some try-out together with Phidgets and the 2EC0 offset, without any luck, no movement of the rudder control at all when looking to the default 737 ruddertrim scale onto the panel when assign this offset to the Phidget controls.
Both elevator trim control and elevator trim indicator are working fine when turning the rotation sensor conected to Phidget 8/8/8 interface and see mving the servo conected to the Phidget servo-board (also visable onto the Phidget LCD) using the following offsets:
[ELEVATOR_TRIM_CONTROL]
Offset=0BC0
Length=2
FSType=Proportional
LoValue=-16383
HiValue=16383
[ELEVATOR_TRIM_INDICATOR]
Offset=0BC2
Length=2
FSType=Proportional
LoValue=-16384
HiValue=16384
Don't know why this can't be done the same with rudder-trim control, because when you clicking this function in the 737 panel (see attachment picture) it must be possible I think !
Hope you can help to sort it out !
Gert