Rc Mode 2 Channel Assignment

This article shows how to perform radio control calibration using Mission Planner.

Overview¶

RC transmitters are used to control vehicle movement and orientation. Copter and Plane minimally control throttle, pitch, roll and yaw, while on Rover we just control throttle and roll. Each of these control signals are mapped to transmitter stick/switch(s) and in turn to autopilot channels from the connected receiver.

Calibrating each of the transmitter controls/channels is a straightforward process - simply move each of the enabled sticks/switches through their full range and record the maximum and minimum positions.

Transmitter configuration¶

There are two main transmitter configurations:

  • Mode 1: left stick controls pitch and yaw, the right stick will control throttle and roll.
  • Mode 2: left stick controls throttle and yaw; the right stick will control pitch and roll.

Transmitter(Mode 1): Recommended Channels

Transmitter(Mode 2): Recommended Channels

Channel mappings¶

Copter default channel mappings are:

  • Channel 1: Roll
  • Channel 2: Pitch
  • Channel 3: Throttle
  • Channel 4: Yaw
  • Channel 5: Flight modes
  • Channel 6: (Optional) Inflight tuning or camera mount (mapped to transmitter tuning knob)

Unused channels can be mapped to control additional peripherals.

Preconditions¶

Safety first¶

For safety reasons you should disconnect the battery and/or remove propellers before preforming radio calibration.

Centre trims¶

Centre trims in manual RC mode before preforming RC calibration. If trims are not centred you may need to do the RC calibration again after you have used the vehicle (this is easy to do at the field).

Note

Trims are centred when a moving vehicle does not change direction/speed/orientation when travelling hands-off with all controls/sticks in neutral positions. If there is any deviation in direction, speed or orientation, adjust the associated servo to compensate.

Connect autopilot and turn on receiver¶

Connect the autopilot via USB and turn on your RC transmitter. Verify that the transmitter is bound to the receiver (the receiver displays a solid green light) and that it is set to use the correct model for your vehicle.

Open Mission Planner’s INITIAL SETUP | Mandatory Hardware | Radio Calibration screen. If your RC receiver (Rx) and transmitter (Tx) are bound, you should see the green bars move when you move the transmitter sticks.

MissionPlanner: Radio Calibration Screen (Copter)

Mission Planner: Radio Calibration Screen(Plane)

Tip

If the bars are not moving then check what LED lights the receiver is displaying:

  • no lights - may indicate that it is incorrectly wired to the autopilot (look for connectors that may have been inserted upside down).
  • red or a flashing green light - may indicate that your RC transmitter/receiver need be bound (see the manual that came with your RC equipment for instructions).
  • a solid green light - recheck the autopilot is connected to the Mission Planner and if the bars are still not moving, try clicking on the Calibrate Radio button.

Calibration steps¶

  1. Open Mission Planner’s INITIAL SETUP | Mandatory Hardware | Radio Calibration screen.

  2. Click on the green Calibrate Radio button in the lower right of the window.

    Mission Planner will display a prompt to check radio control equipment is on, battery is not connected, and propellers are not attached. Select OK.

    Mission Planner: Select Calibrate Radio and OK to begin calibrating.

  3. Move the control sticks and toggle switches on your transmitter to their limits of travel and observe the results on the radio calibration bars. Red lines will appear across the calibration bars to indicate maximum and minimum values:

    Mission Planner: Input range marked with red lines

    Tip

    The green bars should move in the same direction as the

    transmitter sticks (except for Pitch where the bars move opposite to stick movements - low values are forward, high values are back). If the green bars move in the wrong direction, reverse them using your RC transmitter’s channel-reverse function (see your RC gear’s manual for guidance).

    You should also calibrate the channel you have selected for controlling vehicle mode, and any other channels you have connected to the autopilot.

  4. Select Click when Done when all required channels are set at the minimum and maximum positions.

    Mission Planner will show a summary of the calibration data. Normal values are around 1100 for minimums and 1900 for maximums.

    Mission Planner: Radio Calibration Results

  5. Turn off your transmitter and disconnect the battery if it was connected.

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FS-TH9X Receiver Channel Assignment?


Dear Forum,
Does anyone have a list of the channel assignments for the 8 channel receiver? I need to know where to plug dual aileron servos. Can I use a 4 channel receiver for dual ailerons?
Thanks!
Mike
Originally Posted by ForeverFlying
Dear Forum,
Does anyone have a list of the channel assignments for the 8 channel receiver? I need to know where to plug dual aileron servos. Can I use a 4 channel receiver for dual ailerons?
Thanks!
Mike
This has nothing to do with the receiver. It's the transmitter that determines which channel is used for which function. Simply go to the monitor screen (AKA Display) and look at what the various controls do when you move the sticks.

The sequence for the first five channels is AETRG (same as Futaba). I would expect the second aileron servo to be on 6.

Obviously a a four channel receiver can't do what's needed if you want to drive the ailerons separately. You would need to use a Y-cable for aileron (plugged into Ch-1), and that precludes individual control.
If it's Mode 2 transmitter then:
CH1-ailerons
CH2-elevator
Ch3-throttle
Ch4-rudder
The other channels are aux, and you would assign a mix to whatever channel you plug the other aileron servo into.(CH5-CH8)
I use CH1 and CH5 for ailerons, and setup a mix for source CH1 destination CH5.

You can use a 4CH receiver for ailerons, but you will need a servo "Y" connector on CH1.
Originally Posted by radialarm
If it's Mode 2 transmitter then:
CH1-ailerons
CH2-elevator
Ch3-throttle
Ch4-rudder
Stick mode doesn't change the channel assignment.
I just accidentally erased my programming. I have dual ailerons for lift and for steering. And dual tail fins for braking.

I got the steering at one point and the lift at another point but not both at the same time as before.

Any ideas on how to fix the issue?

I had used only 3 channels before I know I just don't know what channels they were. (The order)

I believe I only used channels 1-4. Combination of the stickset for lift and tail steering. And then throttle then a CSC for airbrake command.
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