JETI model s.r.o.

Function assignment, servo setup, device explorer

Function Assignment

(Menu → Model → Function Assignment)

After creating a new model using the “Basic Configuration” wizard, a list of control functions is automatically generated. These functions can be freely edited or expanded within the Function Parameters menu. Available options include:

  • Renaming functions
  • Reassigning control inputs (sticks, switches, sliders) to functions
  • Assigning trims to functions and adjusting trim sensitivity
  • Adding new control functions
  • Deleting existing functions
  • Viewing an overview of all functions and their assigned controls

 

Bottom Menu Bar Description:

 F1 Button: Displays an overview of active control inputs for the current model. For each input, a list of linked functions, mixes, voice alerts, etc., is shown.

 

 

 F2 Button: Restores default function assignments.
Warning: Using F2 will reset the current digital trim positions for the model

 F3 Button: Adds new control functions to the model.
Tip: Use F3 to create functions that were not available during the initial model setup via the “Basic Configuration” menu template.

 F4 Button: Deletes the currently highlighted function.

Tip:  DC/DS-16 and DC/DS-24 transmitters support up to 24 control channels. By default, only the first 16 channels are active. To enable channels 17–24, assign any function to these channels and activate the 24-Channel Mode in Menu → Advanced properties → Wireless modes → 24-Channels Multimode Activated.

 

 

 

Functions
The Function column lists all control functions configured for the selected model—either created via the Basic Properties menu or added here using the F3 button. You can rename any function by double-clicking it. The custom name you enter will be used consistently throughout the transmitter’s interface.

 

Control

(Stick/Switch/Knob Assignment)
The Control column displays the control inputs (sticks, switches, sliders, knobs) assigned to each function. These assignments can be modified at any time. Each control input can be configured using buttons F1–F5 as follows:

  • Set as a centered or non-centered control
  • Choose between proportional, 3-position switch, or a logical switch with a custom activation threshold
  • Reverse the control direction
  • Remove the control assignment from a function

 

Tip: When assigning a switch (e.g., 2- or 3-position), move the switch to the desired activation position and hold it, then confirm with F1 to set the trigger threshold.

 

Tip: Some functions (e.g., nosewheel steering, which will later be mixed with the rudder function) may be better left unassigned. A single control input can be assigned to multiple functions.

 

Trim
By default, trim buttons Tr1–Tr2 are automatically assigned to the cross-stick axes (P1–P4). Other functions do not include trim by default, but trimming can be freely configured for any function.

 

Tip: To assign any control on the transmitter as a trim source, simply move that control after entering the Trim menu. You can use not only physical controls but also assign trims via F3 using:

  • Logical switches
  • Digital trims
  • Telemetry-based inputs
  • Any available function
  • Flight modes, and more

These advanced options allow for highly flexible trim configurations based on flight conditions. For example, flap functions can be automatically trimmed using telemetry input Mx1, which adjusts flap deflection based on the aircraft’s airspeed within a defined range.

 

Trim-MAX
The Trim-MAX parameter defines the extent to which a trim input affects the assigned function. The default value is 50%.

  • At 0%, the trim has no effect on the function.
  • At 100%, the trim can control the entire range of the function.

Tip: Entering a negative value will reverse the trim direction, inverting its effect on the function output.

 

 

Servo setup

(Menu → Model → Servo setup) — Used to configure the direction and range of servo travel.

Important:
Before adjusting endpoints electronically, always fine-tune the servo center and endpoints mechanically—by adjusting pushrod lengths and servo arm geometry—to ensure full servo travel is utilized efficiently.

Tip: Always set the center position first, then adjust the endpoints.

 

In the top row, you’ll find:

  • The name of the function being configured
  • Its assigned number
  • The output channel number (in parentheses)
  • A graphical and percentage display of the current deflection

You can navigate the menu using the 3D selector or by moving the control assigned to the selected function.

 

Max/Min Deflection:
Defines the servo travel limits corresponding to the control input’s maximum and minimum positions. The actual travel may still be influenced by trims, mixers, etc.

Max/Min Physical Limit:
Defines absolute travel limits for the servo—these hard limits will never be exceeded, regardless of trims, mixes, or any other inputs.

 

Servo Balancer

When a single control surface is actuated by multiple servos, it is highly recommended to use the Servo Balancer to synchronize their movement across the full range of travel. This reduces mechanical stress, servo load, and power consumption. The same principle can be applied to any functions requiring identical and synchronized deflections—such as flaps or other linked control surfaces.

Recommended Procedure: Designate one servo as the master, and leave its response curve unaltered (a straight line in the Servo Balancer curve). Then, for the remaining servos, adjust the points on their balancing curves so that all servos operate in sync. Ideally, they should draw minimal current or become silent (audible cue) at every position along their full travel.

Note: Before using the Servo Balancer for synchronization, go to Model → Device explorer → Receiver → Receiver Outputs and assign all servos controlling the same control surface to the same servo group (A/B/C).

 

Tip: Distribute all model functions evenly across the available servo groups (A, B, and C). This helps optimize the transmitter–receiver communication and improves overall system responsiveness.

 

Servo Balancer Control
The Servo Balancer allows fine-tuning of a servo's travel across eleven points along its full deflection range. Each point can be individually adjusted within a range of ±10%, with a resolution of 0.1%.

Movement along the 11-point curve axis can be done either by using the 3D control knob or by moving the stick or switch assigned to the relevant function. You can switch between these control modes using the F2 button

  • When using the 3D knob, only the selected point on the curve is adjusted.
  • When using the assigned stick/switch, adjacent points are recalculated automatically, and the curve is smoothed in real time.

Use the F4 button  

to lock the position of the control stick assigned to the function. This eliminates the need to manually hold the control in place while fine-tuning the servo deflection at a specific point.

Tip: For precise servo synchronization using the Servo Balancer, you can monitor current draw from the onboard power system using a CentralBox or MUI sensor. In this case, press F1   to display the current draw value alongside the Servo Balancer screen. This helps identify and minimize servo load across the entire movement range.

 

Device explorer

(Menu → Model → Devices device explorer)

The Connected Devices application allows you to wirelessly configure and manage onboard equipment such as receivers, CentralBoxes, electronic switches, telemetry sensors, and more—provided these components support the EX Bus communication protocol.

Note that this functionality is not available for older JETI products or for very simple devices that do not support configuration.

The “RC Switch” item is always displayed, regardless of the model configuration.

Tip: You can access the Connected Devices menu directly from the main Menu screen by pressing F5 

Important: To ensure full compatibility and functionality, it is highly recommended to keep all connected devices and transmitter firmware up to date.

When the application is opened, it displays a list of all devices installed in the model that are communicating via the EX Bus protocol.
If a device is marked with an “X” or displays only an ID number instead of its name, it means the system has detected the device, but it is currently inactive or not functioning correctly.

Opening any listed device allows you to access and configure all of its available parameters.

 

 

 

Bottom Bar Description

 F1 Button – Direct access to the Wireless Module / Teacher–Student menu. In this menu, you can configure the transmission mode of both 2.4GHz RF modules and bind receivers for both 2.4GHz and 900MHz frequency bands.

Available RF module modes for 2.4GHz:

    • Default Mode: Both 2.4GHz RF modules are active and alternate in communication with a single receiver.

 

    • Double Patch Mode: Each of the two 2.4GHz RF modules communicates with its own dedicated receiver. This setup uses two receivers in the model, each bound separately to the transmitter.

 

Tip: To bind a receiver on the 900MHz backup link, first activate the “Enable 900MHz Backup” option in the menu.

Tip: Pressing F1 repeatedly allows you to disable transmission entirely, or selectively turn off individual RF modules.

 

  F3 Button – Use this to re-scan and detect connected devices in the model, especially after unplugging, replacing, or adding new hardware.
Devices no longer present will be automatically removed from the list, and new ones will be added after detection.