Multiplex Profi TX Operating Instructions Manual page 220

Appendix
PROFI TX
control assigned to throttle limiter, and is independent of the position of the
collective pitch stick.
Dual rate (D/R)
Changes the control sensitivity of a control. If the D/R parameter for a control
function (e.g. Aileron) is set to 50% you can use the assigned switch to
reduce the control surface travels on the model by half for finer control. The
control curve in the graph changes accordingly when you operate the switch
assigned to dual rate.
Expo
Generates a non-linear control function.

For Expo = 0%, the control works in a linear fashion.

The effect of negative values is that smaller control surface travels are
generated around the centre position with the same stick travel, thus
providing finer control.

The effect of positive Expo values is that control surface travels are
increased around the centre position.
The end-travels remain unchanged.
Failsafe
If the receiver stops receiving signals, the servos stop at their most recent
positions (Hold function). If Failsafe positions were stored in the receiver, the
servos return to these positions after 0.75 seconds. This time setting is stored
in the receiver. It can be edited using the MULTIPLEX Launcher.
FastResponse
Reduces the transmission cycle from 21ms to 14ms. This reduces the
response time for control commands. Only 12 servos can be controlled with
FastResponse.
Flight phases
Settings / data sets for a model which can be called up by operating a switch.
The data sets are optimised for particular flight tasks.
Lower limit for throttle (only helicopters)
The lower limit for throttle is used to limit the throttle channel preventing I.C.
engines from being turned off inadvertently.
MagicSwitch
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