Multiplex Profi TX Operating Instructions Manual page 219

Seite 216
"Aileron", "Elevator", "Throttle", etc. are control functions with a set of
configuration options that is specific to their function. A control or fixed value
is assigned to them for operation. Any control function is uniquely identified
by a 12-digit freely configurable name. The PROFI TX can manage 15 control
functions. Control functions are assigned to mixer inputs and servos. Direct
control assignment is not intended.
Differential
Indicates the percentage by which the travel distance of the control surface
down is reduced; if the differential is set to 50%, the travel distance down is
half as great as the travel distance up. The higher the % value, the shorter
the travel distance of the control surface down. The prefix of the percentage
figure indicates on which side of the wing travel is reduced (depending on
control surface linkage and aileron servo sequence).
Why configure a differential?
When flying turns, the outer aileron in the turn moves down, while the inner
control surface moves up. The downward control surface generates greater
drag than the upward control surface. This results in a negative turning
moment (known as adverse yaw) which tends to push the model out of the
turn. This problem is solved by a correctly configured differential.
Digital trim
Digital trim buttons do not have any physical position corresponding to the
actual trim value (which is the case for conventional trim with trim sliders).
The digital trim position is displayed on the screen, and the trim values are
stored in the model memory. If you switch model memories, there is no need
to return the trim sliders to the correct position to suit the model. The correct
trims are immediately available.
If the PROFI TX is used with a model for which you have set up multiple flight
phases, each flight phase has its own trim memory, i.e. it is simple to trim
each flight phase accurately, and independently of the trims in the other
phases.
DTC (only helicopters)
Direct Throttle Control
If DTC is switched on, the throttle channel (regardless of whether it acts upon
a carburettor or a speed controller) is controlled directly by the transmitter
Appendix
PROFI TX