JETI model s.r.o.

Timers, Alarms

Support

Timers


(Menu > Timers/Sensors > Timers)

 

In the Duplex system, using telemetry sensors and their measured values is the preferred and more accurate method for monitoring various events and value progressions. However, if a relevant sensor is not available in the model, you can use timers to measure the duration of different events (e.g. motor runtime), along with alarms and voice outputs. Each model can have up to 10 independent timers (depending on the transmitter type).

Tip: You can display the current values of all or selected timers on the transmitter’s main screens (Menu > Timers/Sensors > Main Screen Data). Measured values are stored in the model’s memory (Menu > Timers/Sensors > Timers > F1 button).

 

Bottom Menu Bar in “Timers”

 

  • F1 (Tool icon): Select the reset type for each timer used in the current model.
    • Short Reset: The timer is reset after switching off the transmitter, changing the model, or using the F5 (Reset) button on the home screen.
      Tip: Useful for rough estimation of battery depletion time.
    • All: All timers are reset after turning off the transmitter or changing the model.
    • None: Timers are not reset even when the transmitter is turned off.
      Tip: Ideal for tracking total airtime or motor runtime (“engine hours”) for the model.
  • F2 (+): Create a new timer
  • F3 (x): Delete the selected timer
  • F4 (Edit): Configure the selected timer
  • F5 (OK): Confirm settings and exit the timer menu

 

 

Creating a New Timer

 

  1. Press F2 (+) to create a new timer.
  2. Confirm or press F4 (Edit) to enter the timer settings.
  3. Description: Enter a short and clear name for the timer.
  4. Initial Value: Set the starting point of the timer. This can also be a negative value, with the countdown ending at e.g. zero.
  5. Target Value: Define the endpoint at which the timer stops (or performs a specific action).

Tip: The combination of initial and target values determines the direction of the countdown.

  • If the initial value is greater than the target value, the timer will count down.
  • If the initial value is less than the target, it will count up.
  • Neither value has to be zero.

 

Timer Type
• Standard: When started, the timer begins counting based on the defined start and target values. Pausing the timer stops the count. Upon restarting, the countdown resumes from the last recorded time.
• Free-running: The timer begins counting after being started and continues beyond the target value. It only stops when the transmitter is turned off, the model is changed, or when stopped manually using the F4 (Stop) button on the main screen.
• Laps: Each activation of the timer records the current time as a lap and restarts the countdown from the start value. The lap number and current unmeasured value are shown on the transmitter's main screen. The maximum number of laps is 20. After stopping the timer (F4 Stop), you can scroll through recorded laps using the 3D knob.

Signal Type
• Tone1, Tone2: During the last minute before reaching the target time, the transmitter gives acoustic alerts with varying tone intervals, increasing in frequency as the time approaches zero.
• Voice, Voice Up: The last 5 minutes of the countdown are announced vocally at progressively shorter intervals. You can optionally enable vibration to accompany the voice countdown.

Switch: Sets the switch that starts the timer.
Reset Switch: Sets the switch that resets the timer to its initial value.
 

Tip: The switch can be a physical control, stick position, telemetry value, logical switch, trim input, etc.

 

Reset Type: Defines how the F5 (Clear) button on the main screen behaves.
• Short Reset: A short press of the button resets the timer to its initial value.
• Long Reset: The transmitter remembers the last timer value even after being turned off. When restarted and the timer is triggered (see “Timer Switch”), it resumes counting from where it left off. The timer can still be reset using a switch (see “Reset Switch”).

Active in Modes: Each configured timer can be active in all or only selected flight modes of the model.
 

Tip: If you want a timer to be active only in a specific flight mode, it’s practical to use the same control that activates the mode to also start the timer.
 

Tip: While setting up the timer, the current timer value is always shown in the F1 position for better orientation.

 

 

 

 

Alarms


(Menu/Timers-Sensors/Alarms)

The individual components of the Duplex system transmit a variety of telemetry data from the model, which are processed and stored in the transmitter. For each telemetry parameter, an alarm can be configured to provide a voice warning when a preset threshold is exceeded or dropped below.

Alarm setup follows the same structure for all telemetry values, accessible via the transmitter menu:

  1. Select the telemetry variable
  2. Enter the threshold value
  3. Choose the sound file to be played when the threshold is reached

Example Alarm Setup
• In the model, an MVARIO2 sensor (measuring altitude, climb/sink rate, pressure, temperature) is connected to the Ext. port of the Duplex R11 receiver, and a Mezon EVO ESC (measuring voltage, current, capacity used, motor runtime) is connected to the MVARIO2’s input.
• The receiver’s Ext. port is set to “EX Bus” and the MVARIO2 input is set as “Expander” (see Menu/Model/Connected Devices).
• You want to be alerted by voice when:

  1. The model reaches an altitude of 100 m
  2. Current draw from the battery exceeds 60 A
  3. 2000 mAh has been consumed from the battery
  4. Receiver and servo supply voltage drops below 4.5 V

To work with alarms, the transmitter must “see” the connected sensors. These must be displayed under Menu/Timers-Sensors/Sensors-Data Logging.

Tip: If only outdated or incorrect sensors are shown in this menu, you can re-scan for connected sensors by pressing F1 (Auto) and confirming the telemetry reset.

 

Note: Sensor detection can take several minutes. If not all sensors and their data appear after scanning:

  • Check that the sensors are correctly connected to the appropriate ports
  • Check that the ports are properly configured (EX Bus, telemetry input, or JETIBOX)
  • Make sure the transmitter firmware is up to date

 

Main Screen Overview – “Alarms” Menu

Morse Code Alarms
These are first-generation alarms intended for use with Duplex RF modules installed in transmitters from other manufacturers. These alarms signal only by beeping a Morse code letter. For Duplex DC/DS transmitters, it is recommended to disable this function.

 

Button Functions

  • F2 (+): Create a new alarm
  • F3 (x): Delete the selected alarm
  • F4 (Edit): Configure the values and settings of the selected alarm
  • F5 (OK): Confirm settings and exit the "Alarms" menu

 

 

“Rx Voltage” Alarm
This alarm is automatically included in every model’s memory and cannot be deleted. It can only be deactivated. Use F4 (Edit) to activate, deactivate, or modify this alarm. The alarm's configuration menu becomes accessible only when the alarm is active.

 

 

Alarm Menu Parameters and Settings

 

Sensor: Fixed name for the “Rx Voltage” alarm. For all other alarms, the sensor name can be selected from a list.

Active: Toggles the alarm on or off. If deactivated, no further configuration options will be displayed.

Condition: Defines the threshold value at which the alarm's sound file will be triggered.

File: Select a sound file from the available list. This file will be played when the Condition value is met.

Tip: Use F1 to play the selected sound file, F2 to stop playback.

Announce Current Value: When enabled, the transmitter will announce the current value of the Condition parameter after the selected sound file is played.
Example: “Low receiver voltage 4.4V.”

Set Throttle to Idle: When enabled, the motor power will automatically be reduced to 25% when the alarm is triggered.

 

Optional alarms have an extended menu with the following additional items:

 

 

Example: Setting an Alarm for Altitude of 100 m

 

Sensor: From the list, select Mvario2: Rel. Altitude and activate it

Condition: Choose X > (value is greater than...) and enter 100 m

File: Select a suitable sound file from the list

Activation Switch: If no switch is selected, the alarm is always active. If a control is assigned, the alarm will activate or deactivate depending on the switch position

Repeat: If disabled, the sound file will play once. If enabled, it will loop. With the option Repeat 3x, it will be played three times

Use Only During Preflight Check: When enabled, the alarm will only be active during transmitter power-on or model change
Tip: This is useful for verifying battery status during model startup, helping to prevent takeoffs with discharged batteries

Vibration Alarm: A vibration alert can be added to accompany the alarm sound

 

Tip: When selecting numeric values using the rotary dial, you can press the MENU button to switch between unit increments (×10, ×100, ×1000), speeding up the selection of large numbers.

Note: Alarm volume depends on the settings in Menu/System/Audio Volume. If a control is assigned to either “Volume” or “WAV File Volume” and is turned all the way down, alarms will not be audible.