1

WooKong Multi-Rotor

User Manual

V 3.9

2013.03.22 Revision

www.dji-innovations.com
©2012 DJI Innovations. All Rights Reserved. 2 | 

Warning & Disclaimer

WKM is an excellent autopilot system offering excellent flight features for low altitude multi rotor, working in 

restricted space compared to a conventional RC helicopter. It is not a toy when installed in multi rotors of any 

size. Despite our efforts in making the operation of the controller as safe as possible when the main power 

battery is connected, such as: disabling MC signal to ESCs when USB is connected; disabling throttle input 

and stick command when throttle stick is not at the lowest position on power up, we strongly recommend 

users to remove all propellers, use power supply from R/C system or flight pack battery, and keep children 

and animals away during firmware upgrade, system calibration and parameter setup.

As DJI Innovations has no control over use, setup, final assembly, modification (including use of 

non-specified DJI parts i.e. motors, ESCs, propellers, etc.) or misuse, no liability shall be assumed nor 

accepted for any resulting damage or injury. By the act of use, setup or assembly, the user accepts all 

resulting liability.

DJI Innovations accepts no liability for damage(s) or injuries incurred directly or indirectly from the use of this 

product. Please read this manual carefully and strictly follow the steps to mount and connect the WooKong 

for Multi Rotor (WKM) system on your multi rotor, as well as to install the Assistant software on your 

computer.

Please observe all local laws and regulations of the country you are operating the equipment in.

For example:

AMA’s (Academy of Model Aeronautics) National Model Aircraft Safety Code, USA

BMFA (British Model Flying Association) Model Aircraft Safety Code.

CAA (Civil Aviation Authority) Model Aircraft and UAV Codes of practice.

DMFV (German Model Flying Association) Model Aircraft Safety Code.

These are only a few examples; please investigate the laws and regulations for your particular location.

Never fly over others or near crowds.

DJI and WooKong is registered trademark of DJI Innovations. Names of product, brand, etc., appearing in 

this manual are trademarks or registered trademarks of their respective owner companies. This product and 

manual are copyrighted by DJI Innovations with all rights reserved. No part of this product or manual shall be 

reproduced in any form without the prior written consent or authorization of DJI Innovations. No patent liability 

is assumed with respect to the use of the product or information contained herein.
©2012 DJI Innovations. All Rights Reserved. 3 | 

WKM Profile

DJI WooKong for multi-motors (WKM) is an autopilot system designed for serious multi-rotor enthusiasts 

providing excellent self-leveling and position holding, which completely takes the stress out of flying RC 

multi-rotors for both professional and hobby applications. WKM can be installed in a variety of models from

quad-rotor to octo-rotor.

WKM Control Modes

GPS Atti. Mode Atti. Mode Manual Mode

Command 

Stick Meaning

Multi attitude control; Stick center position for 

0 ̊ angle, stick endpoint is 35 ̊ angle.

Maximum angular velocity is 150°/s. 

No attitude angle limitation and 

vertical velocity locking.

Command 

Linearity

YES

Stick Released

Locks multi-rotor 

position when GPS 

signal is adequate.

Only attitude 

stabilization.

NOT Recommend

Altitude Lock

Maintains the altitude, best above 1 meter 

from the ground.

NO

GPS Lost

When the GPS signal 

is lost for more than 

10seconds, the 

system enters Atti. 

Mode automatically.

Only attitude 

stabilization, GPS / 

position lock not 

used in this mode.

GPS not used

Safety

Mixture of Attitude & speed control ensures 

stability; Enhanced FailSafe

Depends on experience.

Applications AP work Sports flying. Extreme flying
©2012 DJI Innovations. All Rights Reserved. 4 | 

In Box

Main Controller (MC) ×1

The Main Controller (MC) is the brain of the system, it communicates with 

the IMU, GPS/Compass,ESC’s and RC transmitter to carry out autopilot 

functionality. The Main Controller has a USB interface for configuration 

and firmware updates via a PC.

IMU ×1

The Inertial Measurement Unit (IMU) consists of one 3-axis

accelerometer, one 3-axis gyroscope and a barometer. It is used for 

sensing the attitude.

GPS & Compass ×1

The GPS/Compass module is for sensing the position and direction.

LED Indicator ×1

The LED indicates different states of system.

Power Management Unit (PMU) ×1

Specially designed for the WKM to convert the higher voltage of the 

power circuit to the lower voltage required for the receiver etc. It contains 

two regulated power outputs for the entire WKM control system and 

receiver separately, a battery voltage monitor, and two CAN-Bus 

interfaces.

GPS Bracket ×1

Because the GPS & Compass are sensitive to magnetic interference, you should use this bracket to mount 

the GPS module.

PMU Connecter ×1

For connections between battery, ESCs and PMU.

USB Cable ×1

This cable is used to configure the MC and to update the firmware.
©2012 DJI Innovations. All Rights Reserved. 5 | 

3-PIN Servo Cable ×10

Cables used to connect the Main Controller to the RC receiver.

Mounting Pads ×4

For fixing WKM components on the multi-rotor’s frame.

Warranty Information Card ×1

It lists the necessary steps for using the WKM system and related safety advice. Please fill out the 

customer & multi rotor information card and return to DJI Innovations to register your product warranty.
©2012 DJI Innovations. All Rights Reserved. 6 | 

Index

WARNING & DISCLAIMER............................................................................................ 2

WKM PROFILE............................................................................................................. 3

IN BOX ........................................................................................................................ 4

INDEX ......................................................................................................................... 6

IMPORTANT INFORMATION........................................................................................ 7

ASSEMBLY................................................................................................................... 9

ASSISTANT SOFTWARE............................................................................................... 10

SOFTWARE AND DRIVER INSTALLATION.....................................................................................10

GUI (GRAPHICAL USER INTERFACE) .........................................................................................10

FIRMWARE UPGRADE...........................................................................................................12

PRODUCT INFO ...................................................................................................................12

CONFIGURATION....................................................................................................... 13

1. MOUNTING.............................................................................................................13

2. MOTOR MIXER ........................................................................................................15

3. TX MONITOR ...........................................................................................................17

4. AUTOPILOT ..............................................................................................................21

5. GIMBAL ..................................................................................................................33

6. VOLTAGE MONITOR..................................................................................................35

FLIGHT ...................................................................................................................... 39

DIGITAL COMPASS CALIBRATION ............................................................................................39

TEST FLYING.......................................................................................................................41

FLYING WITH GPS ...............................................................................................................43

ENHANCED FEATURES................................................................................................ 44

ATTITUDE CONTROL WHEN ONE MOTOR OUTPUT HAS FAILED ....................................................44

FLIGHT LIMITS SETTING ............................................................................................. 44

HEIGHT LIMIT .....................................................................................................................44

DISTANCE LIMIT ..................................................................................................................44

FIX THE TBE (TOILET BOWL EFFECT) PROBLEM ........................................................... 45

APPENDIX ................................................................................................................. 46

CUSTOMIZE MOTOR MIXER...................................................................................................46

MULTI-ROTORS SUPPORTED ..................................................................................................51

PORT DESCRIPTION..............................................................................................................52

LED DESCRIPTION ...............................................................................................................53

RECOMMENDED SETTING......................................................................................................54

SPECIFICATIONS ..................................................................................................................55
©2012 DJI Innovations. All Rights Reserved. 7 | 

Important Information

For safety reasons, please pay serious attention to all following items:

1 Please disconnect the ESCs from the power battery or remove all propellers during firmware 

upgrade, configuration and system setup.

2 Pay attention to the IMU mounting direction; Do not mount the IMU upside-down.

3 You have to reboot the MC and redo the TX calibration after you change the RC system.

4 In the TX Calibration menu of assistant software:

 Throttle: Screen slider left is craft down, slider right is craft up

 Rudder: Screen slider left is nose left, slider right is nose right

 Elevator: Screen slider left is craft back, slider right is craft front

 Aileron: Screen slider left is craft left, slider right is craft right

5 GPS/Compass is sensitive to magnetic interference; it should be mounted far away from any 

electronic devices and motors.

6 Make sure you switch on the transmitter first, then power on the multi-rotor. Power off the 

multi-rotor first, then switch off the transmitter after landing

7 Do not fly in GPS Mode when the signal is not good (red light blinks)

8 If you enable the gimbal control in the assistant software during the configuration, please note 

that there will be an output from the F1 and F2 ports. With the gimbal enabled you must not 

connect these ports to ESCs which are connected to motors/propellers.

9 Do NOT set the FailSafe position of the throttle below 10%.

10 Throttle stick position should always be higher than 10% from cut-throttle during the flight

11 You must set up the Low voltage protection properly in the assistant software. You should land 

your multi-rotor ASAP after any indication of low voltage, to prevent your multi-rotor from 

crashing or other harmful consequences

12 Using Immediately mode to stop motors: To start the motors you execute Combination Stick

Command (CSC) and push the throttle above 10% within 3 seconds, if the throttle is not above 

10% within 3 seconds then the motors will stop. In any control mode, once motors start and 

throttle stick is above 10%, motors will stop immediately when throttle stick is lowered below 10% 

again. At this point, if you raise the throttle stick above 10%, within 5 seconds after motors stop, 

motors will re-start with no need for Combination Stick Command (CSC). After 5 seconds you 

will need to execute Combination Stick Command (CSC) to restart the motors.

13 Using Intelligent mode to stop the motors: The motors will start or stop immediately when you 

execute Combination Stick Command (CSC). During normal flight, lowering the throttle stick 

below 10% will not stop the motors in any control mode. If you execute CSC during flight then 
©2012 DJI Innovations. All Rights Reserved. 8 | 

the motors will stop, you will have to execute CSC again to re-start the motors if they stop 

during the flight.

14 When you set Mixer Type from Octo-rotor to Quad-rotor / Hexa rotor, the gimbal setting will 

automatically switch to off for safety, which may lead the gimbal to tilt to one side, please turn 

to the Gimbal section for reconfiguration.

15 It is strongly recommended to install the receiver under the bottom board of the center frame, 

with the antennas pointing downwards without any obstacle. Control of the aircraft could be 

lost if the radio signal is lost due to an obstacle (such as the base plate).

16 Make sure all connections are correct, secure and in good condition before flight.

17 Keep wireless video transmission equipment a distance away from the main controller (>25cm), 

to prevent interference to the main controller.
©2012 DJI Innovations. All Rights Reserved. 9 | 

Assembly

R/C System · These are example connections. Please setup Aileron, Elevator, Throttle, Rudder channels on your Tx first, and choose one 2 or 3 positions switch/ channel as control mode switch, then connect your receiver to the right ports on MC.

R/C Receiver (JR) AUX2 AUX1 GEAR RUDD

THRO AILE ELEV

AUX2

R/C Receiver (Futaba / Hitec)

1

2

3

4

7 Futaba S-Bus/S-Bus2 S-Bus/S-Bus2 Battery

IMU · The IMU is best positioned near the multi rotor’s center of gravity, where vibration is relatively low. · Orient the IMU such that the arrow marked on the printed surface of the IMU faces the sky and points directly forward, backward, left or right. · The sides of the IMU should be precisely parallel to the multi rotor body. Use double-sided foam tape for secured installation. · Check the double faced adhesive tape regularly to ensure that the IMU is securely positioned. · DO NOT cover the ventilation holes, keep them unobstructed. · The IMU module is NOT water-proof or oil-proof. · Do not mount the IMU upside-down.

Main Controller · There is no orientation requirement for the Main Controller. Choose a mounting location where as shorter ESC extension wires are needed as possible. Please make sure all ports are accessible when installing the MC so as to facilitate wiring and software configuration. · In three-pin ports, pins near the nicks are signal pins. · After choosing a location to mount the MC, it is recommended that you DO NOT mount the MC until all wirings and software configurations are completed.

ESC & Motor · Please make sure you are using the ESCs and motors recommended by the manufacturer of your multi rotor first. We recommend you use DJI motors and ESCs. WKM output is 400Hz refresh frequency. · Connect all ESCs to MC by the motor numbering method introduced in Multi-Rotors Supported of Appendix. · If you use 3rd party ESCs, please make sure the ESCs travel midpoint is at 1520us. DO NOT use 700us travel midpoint ESC, as it may lead aircraft to fly away or cause injury and damage. After connect ESCs, calibrate ESCs one by one through the receiver directly before connect them to your MC, Make sure program all of them into Governor off, Break off and Normal Start up to get best experience. · If you use 3rd party ESCs, please cut the red wire (power wire) of your ESCs , as the power from V-SEN on PMU is suitable to most of receivers and other electronic devices. · If you use extra BEC, please use a servo cable without power wire to connect V-SEN to X1. (Not recommend)

LED Indicator · Place the LED indicator at an appropriate location of craft body far away from the GPS. Do not mount it on other electronic devices. · Make sure You can see the light during the flight. · You can connect LED to the CAN-Bus port on GPS connection wire.

PMU & Battery · There is no requirement for PMU mounting. · Use our PMU Connecter (red line depi c t s in figure) to connec t battery, PMU and ESCs. · F o r s a f e t y r e a s o n , p l e a s e disconnect ESCs and battery connecter during the firmware u p g r a d e a n d c o n f i g u r a t i o n procedure. · You can choose 2S-6S LiPo battery. · Sufficient air flow over the PMU is highly recommended.

GPS/COMPASS · GPS/Compass is sensitive to magnetic interference, should be far away from any electronic devices. · You should use epoxy resin AB glue to assemble the GPS bracket first as the figure showed in previous page. · Mount the bracket on the center plate of craft first, then fix the GPS on the plate of the bracket (by 3M glue provided). The GPS is sensitive to vibration interference, so position the bracket at least 10 cm from any rotor. · The DJI logo marked on the GPS should face the sky, with the orientation arrow pointing directly forward. The GPS/Compass is packaged with a special indication line for mounting for the first time. · If you are uncertain whether materials near the GPS/Compass module are magnetic or not, you can use a compass or magnet to check it. If you use your own mounting rod, make sure it is NOT magnetic!

Pitch F1

F2 Roll

ESC

R/C Receiver (PPM) PPM

M6

M5

M4

M3

M2

M1

M8

M7
©2012 DJI Innovations. All Rights Reserved. 10 | 

Assistant Software

Software and Driver Installation

STEP1: Please download assistant software and driver from our website. If your operating system is 

32bit, download 32bit driver; if your operating system is 64bit, download 64bit driver. Then 

decompress;

STEP2: Connect MC (Main Controller) and PC via USB cable, power on MC;

STEP3: If operating system tries to install driver automatically, cancel it.

STEP4: Open folder DJI_Wookong_M_Driver_32bit or DJI_Wookong_Multi_Rotor_Driver_64bit, 

double click Driver Setup.bat file and follow the steps to finish installation.

STEP5: Open the assistant software folder, double click Setup.exe file and follow the steps to finish 

installation.

GUI (graphical user interface)

1 5 2 6 3 4 9

13 14 12 11 10

7 8

15
©2012 DJI Innovations. All Rights Reserved. 11 | 

1 TOOL

 Flight Limits: Set the height limit or distance limit if necessary, please refer to the section of “Flight 

Limits” for details.

 Firmware upgrade: Update your firmware from DJI server, keep your WKM system up-to-date.

 Disable All Knob: Set remote gains in “Autopilot” menu to INH

 Check for Updates: Check for latest versions of assistant software and firmware. If necessary, 

you can follow the links displayed to find the download page.

2 ABOUT

 Info: Information regarding your WKM.

 Error Code : Error code list

3 中文: Chinese interface.

4 ENGLISH: English interface.

5 WRITE: Write data of the current page to your MC. The parameter or the title of which will turn red and 

bold when modified, make sure you click the Write button or press Enter to update your system. 

Optional parameters will be written to MC directly after modification.

6 READ: Read parameters from MC for current page.

7 EXPORT: Export configuration data.

8 IMPORT: Import version compatible configuration data.

9 Graphical guidance

10 Text guidance

11 CONTROL MODE: Control mode indication.

12 MC Output On: Indicates the outputs of the ESCs are enabled; when communication is established

between MC and assistant software via the USB cable, MC Output Off appears, it indicates no output 

to the motors, and then you can safely configure your multi rotor with the assistant software.

13 Red light: WKMPC has been disconnected.

Green light: WKMPC is connected.

Blue light: WKMPC communication.

14 Configuration sub menus.

15 Configuration step.

Note:

 Please power the MC first, then connect your MC to a internet enabled computer by the USB cable 

before you open the assistant software. You have to register at the first time you use the assistant 

software. It will auto detect the software version when you open the assistant software and will give 

you a prompt message if your version is not the latest one.

 Do not disconnect MC and PC when you are importing or exporting data. You can only import 

version compatible configuration data.
©2012 DJI Innovations. All Rights Reserved. 12 | 

Firmware Upgrade

Please strictly follow the operation procedure for firmware upgrade, otherwise WKM might not work properly.

For safety reasons, use the PMU to supply power for the main controller, and do not use power battery to 

motors during firmware upgrade.

1. Make sure your computer is connected to the Internet.

2. Please close all other applications during the firmware upgrade, including anti-virus software and 

firewall.

3. Make sure the power supply is securely connected. DO NOT un-plug the power supply until 

firmware upgrade has finished.

4. Connect MC to PC with the Micro-USB cable; DO NOT break the connection until firmware upgrade

is finished.

5. Run Software and wait for connection.

6. Select TOOLFirmware Upgrade.

7. DJI server will check your current firmware version, and get the latest firmware prepared for the unit.

8. If there is a firmware version more up-to-date than your current version, you will be able to click the 

Upgrade button.

9. Wait until Assistant software reads Finished.

10. Click OK and power cycle the unit after at least 5 seconds.

Your unit is now up-to-date.

Note:

 After firmware upgrade, please re-configure WKM using Assistant software. Default all values 

before re-entering your settings.

 If it is notified that the network or DJI server is busy, please try again later with above procedures.

 If firmware upgrade failed, WKM will enter waiting for firmware upgrade status automatically, please 

try again with the above procedures.

Product Info

You can check the MC product version via ABOUT  Info. This includes software version, firmware version, 

IMU version, hardware ID and loader version. S/N is a 32 digit authorization code for unit function activations. 

We have already filled in the authorization code for your unit after manufacture. You might be asked to fill in 

the new S/N in the future if you brought new function upgrades. Fill-in the S/N and then click Write button. If 

you filled in an invalid S/N over 30 times, your MC will be locked and you have to contact our customer

support.
©2012 DJI Innovations. All Rights Reserved. 13 | 

Configuration

1. Mounting

STEP1: IMU Orientation

Select IMU mounting orientation. Orientate the IMU such that the arrow marked on the printed surface of the 

IMU faces the sky and points directly forward, backward, left or right. The sides of the IMU should be 

precisely parallel to the multi rotor body. 

Note:

Do not mount the IMU upside-down.

STEP2: Mounting Location

Install all payloads that will be used during the flight, including batteries, camera mount and camera. Balance 

the multi rotor as you would normally, with the center of gravity (C.G.) directly on the center plate. Fill in the 

distance between the center of the IMU / GPS case and the C.G. of the multi rotor in X, Y & Z axis as showed 

in the figure.

Notices:

Note:
©2012 DJI Innovations. All Rights Reserved. 14 | 

1 You must re-measure and re-configure if the ALL-UP-WEIGHT of the multi rotor has changed.

2 If measured locations are not accurate enough or the signs (+/-) are wrong, then the error on the X, 

Y,Z axis will lead to an oscillation of your multi rotor.

3 Make sure you follow the diagram in our assistant software: red is positive, green is negative; unit of 

measurement is CM, NOT INCH...i.e. centimeters.
©2012 DJI Innovations. All Rights Reserved. 15 | 

2. Motor Mixer

STEP1: Mixer Type 

Set your transmitter into AEROPLANE mode. Then select the right mixer type according to your multi-rotor. 

Tips:

 We support nine types of multi-rotors. Please refer to “Multi-Rotors Supported” in “Appendix”:

 If you want to use a camera gimbal with an Octo-rotor, you have to use an S-Bus, S-Bus2 or PPM 

receiver, and then you can use port T and R for gimbal control. Otherwise, there will be no ports 

available on the MC for gimbal control.

Note:

 Do NOT follow the instructions from your multi-rotor manufacturer! Make sure the rotation direction 

of each motor is the same as the assistant software figure shows. If the rotation is wrong, switch any 

of two wire connections of the incorrect motor to change its rotation direction.

 Make sure the type of propeller matches the rotation direction of the motor.

 When you set Mixer Type from Octo-rotor to Quad-rotor / Hexa rotor, the gimbal setting will 

automatically switch to off for safety, which may lead the gimbal to tilt to one side, please turn to the 

Gimbal section for reconfiguration.

Customize: This section is reserved only for very special cases, such as customized airframes in 

non-conventional rotor arrangements. In the event, an airworthy multi-rotor craft with such rotor arrangement 

will require customized settings to meet the WKM controller algorithm. Please write to our support department 

or dealer together with photos of the multi-rotor for assistance.
©2012 DJI Innovations. All Rights Reserved. 16 | 

Tips:

 Please refer to “Customize Motor Mixer” section in “Appendix” for how to customize a central 

symmetry multi rotor.

 If you customize the motor mixer of a quad-rotor or hexa-rotor, F1 and F2 ports can still be used for 

gimbal servo control.

STEP2: Motor Idle Speed

Motor Idle Speed: is the lowest speed after motor start. Set Motor Idle Speed will affect the motor lowest 

speed after motor start. There are five levels from LOW speed to HIGH speed, and the default is 

RECOMMEND. You can click and drag the cursor to the corresponding level, to change Motor Idle

Speed.

LOW RECOMMEND HIGH

Lower motor idle speed Higher motor idle speed 

Set Motor Idle Speed as LOW, the motor idle speed will be lowest.

Set Motor Idle Speed as HIGH, the motor idle speed will be highest.

RECOMMEND is the advised level.

You can reset the Motor Idle Speed according to the real situation.

Note:

 For users whose aircraft takes off at a low throttle position, please set the idle speed at a low level.

 For common users, please set Motor Idle Speed to RECOMMEND or above, since setting idle 

speed too low may affect the motor(s) spool up.

Tips:

 The output pulse width for every point of Motor Idle Speed is as follows

LOW RECOMMEND HIGH

output pulse width 1144 us 1160 us 1176 us 1192 us 1208 us

 There is a relationship between the output pulse width and the max/min pulse width when the TX 

End Point is 100%.

output pulse width=(max pulse-min pulse) x proportion + min pulse

 You can get the proportion value by calculating according to the above formula for a special TX. Use 

Futaba TX for example. Notice that Futaba TX End Point is 100%.

LOW RECOMMEND HIGH

proportion value 3% 5 7% 9% 11%
©2012 DJI Innovations. All Rights Reserved. 17 | 

3. Tx Monitor

Note:

Make sure you have removed all propellers before this step!

STEP1: Receiver Type

Choose the type of your receiver. If you use an S-Bus or S-Bus2 receiver, please choose S-Bus/S-Bus2 

compatible option: D-Bus. If a PPM receiver is used, please choose PPM. Otherwise choose Tradition.

Note:

Please reboot the MC and redo the calibration after you change the setup of your transmitter or change 

your receiver!

Tips:

 If you use S-Bus/S-Bus2/PPM receiver, the communication of A, E, 

T, R, U, X2 and X3 channels are all through the D-Bus/PPM

channel. Right figure shows the connection of default transmitter

channels and MC channels in S-Bus/ S-Bus2/ PPM receivers (Only 

the first 8 channels of S-Bus/S-Bus2/ PPM receivers are used at 

the moment). Then the original T and R channels are for Gimbal 

servo control.

Transmitter Channels MC Channels 1

2

3

4

5

6

7

A

E

T

R

U

X2

X3
©2012 DJI Innovations. All Rights Reserved. 18 | 

STEP2: Cut Off Type

Please read the introductions of start and stop motor in this step first, and then choose a cut off type.

1 Start Motor: When using WKM, pushing the throttle stick before takeoff will not start the motors. You 

have to execute any one of following four Combination Stick Commands (CSC) to start the motors:

2 Stop Motor: We provide two options to stop motors: Immediately, or Intelligent.

 Immediately Mode: By using this mode, in any control mode, once the motors start and the 

throttle stick is above 10%, the motors will stop immediately when the throttle stick is back 

below 10% again. In this case, if you push the throttle stick above 10% within 5 seconds after 

the motors stop, then the motors will re-start, CSC is not needed. If you don’t increase the 

throttle stick within 3 seconds of the motors starting, then the motors will stop automatically.

 Intelligent Mode: By using this mode, different control modes have a different way of 

stopping the motors. In Manual Mode, only executing CSC can stop the motors. In Atti. or

GPS Atti. Mode, any one of the following four cases will stop the motors:

a) If you don’t increase the throttle stick within 3 seconds of the motors starting

b) Executing CSC

c) Throttle stick under 10%, and after landing for 3 seconds.

d) The angle of the multi-rotor is over 70°, and throttle stick under 10%.

Tips (Intelligent Mode):

1 You have to execute CSC to start the motors. “Only” raising the throttle stick will not start the 

motors.

2 In Atti. / GPS Atti. Mode, it has landing judgment, which will stop the motors.

3 Start motors in Atti. / GPS Atti. Mode, you have to execute CSC and then push throttle stick over 

10% within 3 seconds, otherwise motors will stop after 3 seconds.

4 During normal flight, only lowering the throttle stick under 10% will not stop the motors in any control 

mode.

5 For safety reasons, when the slope angle of the multi-rotor is over 70° during the flight in Atti. / GPS

Atti. Mode (may be caused by collision/crash, motor and ESC error or propeller broken), and throttle 

stick is under 10%, the motors will stop automatically.

6 You can stop the motors by executing CSC in any control mode.
©2012 DJI Innovations. All Rights Reserved. 19 | 

Note:

1. The two cut off types will only work correctly if the Tx calibration is correct.

2. When Tx commands are valid under any control modes, the motors will start or stop immediately 

when you execute CSC. It has nothing to do with the current throttle stick position. Please DO NOT 

executes CSC during flight without a good reason.

3. If you choose Immediately mode, you should not lower the throttle stick under 10% during 

flight, because this will stop the motors. If you do it accidentally, you should push the throttle 

stick above 10% within 5 seconds to re-start the motors.

4. If you choose Intelligent mode, throttle stick below 10% will trigger landing judgment in any control 

mode. In this judgment, pitch, roll and yaw controls are disabled except throttle, but the multi-rotor 

will still auto level.

5. In any control mode, DO NOT lower the throttle stick below 10% during normal flight without a good 

reason.

6. In any auto action caused by FailSafe or low voltage protection (e.g. auto Go Home),any 

commands applied to start or stop the motors are denied by the MC, motors will auto control.

STEP3: Command Sticks Calibration

On screen Slider Definition:

T : Slider left is craft down, slider right is craft up

R : Slider left is nose left, slider right is nose right

E : Slider left is craft back, slider right is craft front

A : Slider left is craft left, slider right is craft right

STEP1: Set endpoints of all channels to default values (100%) and set all trims and sub-trims of sticks 

to 0 on your transmitter first. Keep all curves’ settings as default since the end-point of transmitter 

sticks will be recorded here.

STEP2: Click START button, and move all of the sticks throughout 

their complete range several times.

STEP3: After that, click FINISH button when you finished above procedures.

STEP4: If the moving direction of the slide is opposite to the Slides Moving Definition, click the reverse 

button REV/NORM at the right side of the screen.

Note:

1. All sliders should become when all the Tx sticks are in the middle positions. If the sliders cannot 

go back to center points (become ), just click FINISH, then the sliders will be at center 

automatically. If still not centered, please reboot the MC, and do not apply any Tx command during 
©2012 DJI Innovations. All Rights Reserved. 20 | 

the reboot.

2. CSC may not start motors If trims and sub-trims of Tx sticks are not 0!

STEP4: Sticks Monitor

This step is optional. X2 and X3 is for remote gain tuning; X3 is also for gimbal pitch control. Setup the 

channel on your RC correctly.

STEP5: Control Mode Switch

Whichever 2 or 3 position switch on your transmitter you have selected to use as control mode switch, 

connect the correct channel of the receiver to the U port of the MC. At each switch position, use end-point fine 

tuning on your transmitter. Move the Transmitter slider/switch of the channel U to GPS (GPS Atti Mode), A

(Atti. Mode), M (Manual Mode) and adjust the Tx end-points and mid-point to turn the corresponding area on 

the assistant software blue shown at the bottom of the TX MONITOR screen.

Tips:

 To move the slider is to adjust end-points of the channel selected.

 For 3-position switch, you should assign:

Position-1 to Manual Mode; Position-2 to Atti.

Mode; Position-3 to GPS Atti. Mode; or reverse 

the assignment for Position-1 and Position-3.

 For 2-position switch, you can assign any two of the three control modes as you like.

Important: You must setup the FailSafe of your Transmitter so during a FailSafe situation the area which 

reads FailSafe Mode turns blue. Once FailSafe is setup, if you switch off your transmitter, the U channel 

slider should move to FailSafe Mode and turn the corresponding area to blue. Otherwise please reset the 

FailSafe. Please refer to your RC manual for the details of FailSafe setup.

Note:

 Do NOT set the FailSafe position of the throttle below 10% endpoint.

 MC will not execute the FailSafe protection if you don’t set it properly. You can verify the 

FailSafe settings by switching off your transmitter, and then you can use the following 

methods to check whether the MC is in FailSafe mode.

 Check the Assistant Software status bar at the bottom of the software interface. 

Control mode will change to FailSafe.

 Check the LED indicator. Read the appendix in this manual for details. LED will give blue 

blinking if in FailSafe mode.

Tx

1 2 3 3 Position Switch
©2012 DJI Innovations. All Rights Reserved. 21 | 

4. Autopilot

STEP1: Basic Parameters

Usually, the default parameters are ready to go. However, different multi rotors have different gains because 

of different size, ESC, motor and propeller. If the gain is too large, you will find the multi rotor oscillating in the 

corresponding direction (About 5~10Hz). If too small, the multi rotor maybe hard to control. So you can setup 

the basic Gain of Pitch, Roll, Yaw and Vertical manually according to your multi rotor to have a pleasing flight

experience. We suggest you change the values by 10% to 15% at a time and test fly.

For the gains of Pitch and Roll, if you release the Pitch or Roll stick after a command stick input, the 

multi-rotor will revert back to the hovering state. If the reaction of the multi-rotor in this procedure is too soft 

(large delay), please increase the basic gain slowly (10%-15% each time) until oscillation is noticed after you 

release the stick. Then decrease the gain a little until the oscillation just disappears. Now the gain is perfect. If 

the Tx stick reaction of the attitude is slow, you should follow the section a little down the page to tune the 

attitude gains.

The way of tuning the Yaw gain is the same as the way of adjusting the Tail Gyro of a helicopter. If you want 

quicker stopping reaction speed, increase the gain, otherwise decrease the gain. However, the rotation speed

of the multi-rotor is produced by the counter torque reaction force, and the magnitude of which is limited. 

Therefore, a large gain value will not produce tail oscillation like on a helicopter, but severe reaction of the 
©2012 DJI Innovations. All Rights Reserved. 22 | 

start or stop of the motors, which will affect the stabilization of other axis.

You can use two methods to judge if the Vertical gain is good enough: 1) The multi-rotor can lock the altitude 

when the throttle stick is at the center position; 2) The change of altitude is small during the flight along a 

route. You can increase the gain slowly (10% each time) until an oscillation in the vertical direction appears or 

the reaction of the throttle stick is too sensitive, then decrease 20% of the gain. Now you should have a

suitable Vertical gain.

Attitude gains determine the reaction speed of attitude from a Tx command stick input. The bigger the value 

the quicker the reaction from the Tx command. Also, an increased value will also give a sharper and quicker 

leveling action after the command stick is released. The control feeling will be stiff and rigid if the value is too 

high; and sluggish leveling action and slow braking if too small.

Note:

 You MUST click the Default button before configuring the gains for the first time, and also after a 

firmware upgrade, before re-entering your settings.

 The vertical gain has no effect in manual mode.

Tips:

 If you are a new user to this system, you can tune the basic parameters first as follows: 

1 Increase the basic parameters 10% at a time so as to make your multi rotor hover or lightly

oscillate after small angular command inputs.

2 Decrease the basic parameters until your multi rotor can just hover without oscillation, then 

decrease 10% more.

 If the basic parameters are far away from the required values, the advanced parameters will not 

work.

 You can use the remote gain-tuning channels to tune the gains during the flight:

1 Follow the instructions in “Assembly” R/C System section to connect and setup correctly;

2 Choose the X2 or X3 channels in Remote Adjust for the gain you want to tune. One channel to 

one gain.

3 The range of the remote tuning is from half of the current entered value to twice current value.

 Usually the Pitch, Roll, Attitude Pitch and Attitude Roll Gains of a hexa-rotor are higher than a 

quad-rotor.

 You will find example settings at the end of this manual
©2012 DJI Innovations. All Rights Reserved. 23 | 

STEP2: Advanced Parameters

Usually you can ignore this section. The default values are suitable for most conditions, so we do NOT 

recommend you to change the parameters here. For some special multi rotor, experienced users can adjust 

the advanced parameters to have a better flight experience.

STEP3: Enhanced FailSafe Methods

FailSafe methods include Hover, Go-home, and Altitude Go-home. Choose one as your FailSafe method, 

which will be triggered when the MC loses the control signal (no matter what mode you flying) one of the 

following situations:

1) Signal lost between transmitter and receiver, e.g. multi-rotor is out of the communication range, or 

transmitter has failed, etc.

2) One or more connections of A, E, T, R, U channels between the MC and receiver is lost. If this happens 

before take-off, the motors will not start if you raise the throttle stick. If this happens during the flight, 

the LED will flash blue to warn you, in addition to the FailSafe method. If Hovering FailSafe method is 

configured and U channel is disconnected, multi-rotor will auto land.

Also, you can select the Go-Home Switch item to start go-home (Go-home, and Altitude Go-home) by using 

a TX switch during the flight, when selected during flight the LED will flash purple instead of blue.

The Multi-rotor position before takeoff, including reference longitude, reference latitude and reference

altitude, is saved as home point by the MC automatically when you raise the throttle stick for the first time 

AND it has 6 or more GPS satellites acquired for more than 8 seconds ( blinks once or no blinking >8secs)

After taking off, every time the aircraft recorded a home-point successfully the LED will blink Cyan quickly for 

indicating.

THEREFORE: to use any form of Go-home (including FailSafe return home), you must make sure 6 or more 

GPS satellites are acquired for more than 8 seconds ( blinks once or no blinking >8secs) before take-off, 

this will assure correct recording of the Home position.

Go-Home Altitude: Determined by the reference altitude and the FailSafe method chosen. That is, the 

go-home altitude may be different due to FailSafe method chosen.

 Hover

The aircraft will remain hovering when the FailSafe starts.

1 Record 2 Flight Tx 3 Hover Tx Aircraft Fail-safe

Home Location (Reference longitude, latitude, altitude ) Signal lost Stay hover If GPS satellite found >= 6 and last 8s, at the first time you pull the throttle stick, then record Home Location
©2012 DJI Innovations. All Rights Reserved. 24 | 

 Go-H (Go-home)

Flight altitude when FailSafe starts > (reference altitude+20m),then go-home altitude=flight altitude when 

FailSafe starts 

Flight altitude when FailSafe starts <= (reference altitude+20m),then go-home altitude=reference altitude

+20m

1 Record 2 Flight Tx 3 Hover Tx

5 Go home Tx Tx 4 Ready to go home Tx 6 Land 20m

Aircraft Home Fail-safe/Enable Go-Home Switch Go home

Home Location (Reference longitude, latitude, altitude ) Signal lost Stay hover

Signal lost > 3s Ready to Go-Home Hover 15s , Then land.

If GPS satellite found >= 6 and last 8s, at the first time you pull the throttle stick, then record Home Location Flight altitude when fail-safe starts >(reference altitude+20m) Flight altitude when fail-safe starts <=(reference altitude+20m)

 Altitude Go-H (Altitude Go-home)

Flight altitude when FailSafe starts > (reference altitude + entered value),then go-home altitude=flight 

altitude when FailSafe starts.

Flight altitude when FailSafe starts <= (reference altitude + entered value),then go-home altitude=

reference altitude + entered value.

Entered value: 20m~300m, the default value is 20m, and has an accuracy of 1m.

2 Flight Tx 3 Hover Tx

5 Go home Tx Tx 4 Ready to go home Tx 6 Land Input value 1 Record

Aircraft Home Fail-safe/Enable Go-Home Switch Go home Input value

If GPS satellite found >= 6 and last 8s, at the first time you pull the throttle stick, then record Home Location Home Location (Reference longitude, latitude, altitude ) Signal lost Stay hover

Signal lost > 3s Ready to Go-Home Hover 15s , Then land. Flight altitude when fail-safe starts >(reference altitude+ input value) Flight altitude when fail-safe starts <=(reference altitude+ input value)

Go-Home Switch: Before using this function, you have to choose a 

2-position switch on your transmitter as the Go-Home switch. Then 

connect the correct channel of the receiver to the X3 port of the MC.

You should assign: Position-1 to Start; Position-2 to Standby; or reverse the assignment for Position-1 and 

Position-2. Move the Tx switch of the channel X3 and check that the corresponding area Start and Standby

turns blue on the assistant software screen. If required adjust the Tx channel end points. 1 2 2-Position

Tx
©2012 DJI Innovations. All Rights Reserved. 25 | 

Note:

 Switching from Standby to Start will enable go-home during flight and you will no longer have flight 

control of the Multi rotor. If the Multi rotor is already in a FailSafe condition, then the go-home switch 

will not work.

 If you switch to Manual Mode or Atti. Mode, (and the multi rotor is not in a FailSafe condition), then the 

go-home is cancelled and you regain control of the multi copter. Once GPS. Mode is re-selected you

can once again use the go-home function.

Tips:

 Use end-point fine tuning on your transmitter to adjust the X3 channel, to give the correct switch 

indication in the assistant software.

 The following example shows how to enable Go-home by the Tx Switch. Use position-1 to Start and 

Position-2 to Standby for example.

Position -1 Position -2 Position -1, if the initial switch position is at Start (Position -1).

Position -2 Position -1, if the initial switch position is at Standby (Position -2).

 The home point of the ground station one key go-home is the same as the point set by user in the 

ground station software.

 If the home point is not set by the ground station, the home point of the ground station one key 

go-home function is the point recorded by the MC.

 If the Go-Home Switch cannot be selected in the assistant software, that may be due to the X3 

channel been set for remote gain tuning, you should change this if required.

 The multi rotor will climb at a speed of 1.5m/s if needed during go-home.

 The multi rotor will change its vertical speed during go-home, as shown below:

>100m height

4m/s

50~100m

3m/s

20~50m

2m/s

10~20m

1m/s

<10 m

0.3m/s

STEP4: Intelligent Orientation Control (IOC)

Forward Direction: The Multi-rotor will fly along this direction when you 

push the elevator stick.

Usually, the forward direction of a flying multi-rotor is the same as the nose direction. By using Intelligent 

Orientation Control (IOC), wherever the nose points, the forward direction has nothing to do with the nose 

direction:

 In course lock flying, the forward direction is the same as a recorded nose direction. See the following 

figures (TX Mode 2):
©2012 DJI Innovations. All Rights Reserved. 26 | 

Usually 

In course lock  In home lock flying, the forward direction is the same as the direction from home point to multi-rotor.

See the following figures (TX Mode 2):

U Home point sually 

Home point In home lock  In POI (POI, Point Of Interest) flying, the roll channel controls the multi rotor circular flight speed 

around a fixed point, the pitch channel is used for controlling the diameter around the fixed point, the 

throttle is used to control the height around the fixed point. See the following chart (Tx Mode 2):

Usually 

Point of Interest POI Semi-diameter

Step1: Before using the IOC function, you have to choose a 2 or 3 positions switch on your transmitter

as the IOC switch, which is also used for recording the multi rotor orientation, home position or 

point of interest in corresponding modes. 

Step2: Connect the correct channel of the receiver to the X2 port of the MC. You can select Control 1 to 

change the IOC control mode options. Three IOC control options are available; they are

 Control 1, Control 2 and Control 3, and every option contains two IOC functions.

Control 1: Home Lock, Course Lock, OFF

Control 2: POI, Course Lock, OFF

Control 3: Home Lock, POI, OFF

Step3: Toggle the Tx switch and observe the slider position of channel X2 on the assistant software 

screen, the corresponding area should turn blue.

Tips:

 For 3-position switch (or exchange Position-1 and Position-3):

Tx

1 2 3 3 Position Switch 1 2 2-Position

Tx
©2012 DJI Innovations. All Rights Reserved. 27 | 

Control 1: Position-1 is OFF; Position-2 is Course Lock; Position-3 is Home Lock.

Control 2: Position-1 is OFF; Position-2 is Course Lock; Position-3 is POI.

Control 3: Position-1 is OFF; Position-2 is POI; Position-3 is Home Lock.

 For 2-position switch:

Control 1: Position -1 is OFF; Position-2 is Course Lock. Or Position -1 is OFF; Position-2 is Home Lock.

Control 2: Position -1 is OFF; Position-2 is Course Lock. Or Position -1 is OFF; Position-2 is POI.

Control 3: Position -1 is OFF; Position-2 is POI. Or Position -1 is OFF; Position-2 is Home Lock.

The course, home point and point of interest can be recorded manually by toggling the 3-position 

switch 3 to 5 times between two switch positions, the recorded point is different for different switch 

combinations. The following shows how the MC will record the different points.

Position-1 Position-2: Position-2 is recorded.

Position-2 Position-3: Position-3 is recorded.

Position-1 Position-3: Position-3 is recorded, but Position-2 may also be recorded at the same 

time. Danger may occur if users are not aware of the change, so it is not recommended to record 

Position-3 by this way.

 If you use an S-Bus /S-Bus2 /PPM receiver, the default channel connection is shown in the Tx 

Monitor – Receiver Type section. Then you only need to assign a 2 or 3-position switch of your 

transmitter to channel 5.

 If the assistant software does not give the correct response, Use end-point fine tuning on your 

transmitter to adjust the X2 channel, to give the correct switch indication in the assistant software, 

the corresponding area should turn blue.

NotE:

When a 2-position switch is used, do NOT set a 2-position switch as: 

Control 1: Course Lock and Home Lock at the same time.

Control 2: Course Lock and POI at the same time.

Control 3: POI and Home Lock at the same time.

Course Lock Usage:

During the same flight:

STEP1: Record STEP2: ON STEP3: OFF STEP4: ON again

Nose direction; Forward direction
©2012 DJI Innovations. All Rights Reserved. 28 | 

STEP1: Record forward direction: There are two ways: Manually and Automatically. The LED will 

blink quickly if recording is successful.

a) Automatically: The MC will record the current nose direction as forward direction, 30 seconds

after you power on the multi-rotor. **PLEASE BE AWARE OF THE FORWARD DIRECTION 

WHEN YOU SWITCH ON THE MULTI ROTOR IF YOU USE COURSE LOCK**

b) Manually: You can switch the X2 channel between OFF and Course Lock position quickly 3 

to 5 times to record the current nose direction as the new forward flight direction at any time 

after you power on the multi-rotor for longer than 30 seconds. 

STEP2: Switch on course lock: Switch the X2 channel from OFF to Course Lock position, when all 

the following requirements are met the LED will blink slowly to indicate the IOC mode.

a) The forward direction is recorded successfully

b) The MC is in Atti. or GPS Atti. Mode

STEP3: Switch off course lock: Switch the X2 channel to OFF position to quit course lock.

STEP4: Switch on course lock again: When all requirements in step 2 are met, Switch the X2 

channel from OFF to Course Lock position.

Note:

Pay attention to the following statement, which may also lead the MC to cancel the course lock:

 Switch U channel to Manual Mode position, or switch off transmitter, or fly in waypoint mode.

Home Lock Usage:

During the same flight:

STEP1: Record STEP2: ON STEP3: OFF STEP4: ON again

Nose direction; Forward direction; Home point; Over 10m distance

STEP 1: Record home point: The home point mentioned here is the same home point as the enhanced 

FailSafe. There are two ways to record this point: Manually and Automatically. The LED will blink quickly 

if recording is successful. 

a) Automatically: Before takeoff, the current position of the multi-rotor will be saved as the home 

point by the MC automatically when you raise the throttle stick for the first time AND it has 6 or 

more GPS satellites acquired for more than 8 seconds ( blinks once or no blinking >8secs)

b) Manually: When 6 or more GPS satellites are found ( blinks once or no blinking), you can 
©2012 DJI Innovations. All Rights Reserved. 29 | 

switch the X2 channel between two positions quickly 3 to 5 times to record the current position 

of the multi-rotor as the new home point. 

(1) 3-position switch:

Control 1: switch the X2 channel between Course Lock and Home Lock position, 

or OFF and Home Lock (NOT Recommended); 

Control 3: POI and Home Lock, or OFF and Home Lock (NOT Recommended).

(2) 2-position switch: switch the X2 channel between OFF and Home Lock position.

STEP 2: Switch on home lock: Switch the X2 channel from OFF to Home Lock position when all the 

following requirements are met. The LED will blink slowly to indicate the IOC mode.

a) Home point is recorded successfully

b) 6 or more GPS satellites are found

c) In GPS Atti. Mode;

d) Multi-rotor is further than 10m away from the home point.

STEP 3: Switch off home lock: Switch the X2 channel to OFF position to cancel home lock. 

Step 4: Switch on home lock again: When all requirements in the second step are met, switch X2 

channel from OFF to Home Lock position to enter home lock mode again.

Note:

Pay attention to the following statement, which may also lead the MC to cancel home lock:

 Switch U channel to Manual Mode or Atti. Mode position, or turn off transmitter, or fly in waypoint 

mode.

 If you select Atti. Mode during home lock flight, then course lock is set using the current (not 

recorded) forward flight direction.

POI (Point Of Interest) Usage:

During the same flight:

STEP1: Record STEP2: ON STEP3: OFF STEP4: ON again

Nose direction; Forward direction; Point of interest; Semi-diameter

STEP1: Record point of interest:

a) Manually: When 6 or more GPS satellites are found ( blinks once or no blinking), you can 

switch the X2 channel between two positions quickly 3 to 5 times to record the current 
©2012 DJI Innovations. All Rights Reserved. 30 | 

position of the multi-rotor as the new point of interest. The LED will blink quickly if recording 

is successful. 

 (1) 3-position switch:

Control 2: switch the X2 channel between Course Lock and POI position,

or between OFF and POI position (NOT Recommended); 

Control 3: switch the X2 channel between OFF and POI position.

(2) 2-position switch: switch the X2 channel between OFF and POI position. 

STEP2: Switch on POI: Switch X2 channel from OFF to POI position when all the following 

requirements are met. After switching on POI, the multi rotor will rotate slowly until the multi rotor

nose points to the point of interest. The LED will blink slowly to indicate the IOC mode.

a) Point of interest is recorded successfully

b) 6 or more GPS satellites are found

c) In GPS Atti. Mode

d) Multi-rotor is further than 5m (and less than 500m) away from the Point of Interest.

Once in POI mode you can use the left/right roll control to control the speed of the circle around the 

POI, you can use the pitch to control the diameter of the circle, and the throttle to control the height 

while circling.

STEP3: Switch off POI: Switch the X2 channel to OFF position to cancel POI mode.

STEP4: Switch on POI again: Switch the X2 channel from OFF to POI position when all 

requirements in step 2 are met, then the multi rotor will once again turn towards the POI.

Note:

 Pay attention to the following statement, which may also lead the MC to cancel POI:

(1)Switch U channel to Manual Mode or Atti. Mode position, or turn off transmitter, or fly in waypoint 

mode.

(2)GPS status is bad, with three blinking. 

(3)Multi-rotor flies back within 5m (or further than 500m) from the POI.

Tips:

1 LED will blink slowly to indicate the IOC mode only when the MC is really flying in course lock or 

home lock or POI.

2 We suggest that you should know clearly which flight lock method you are going to fly, and make 

sure the locked forward direction, home point or point of interest is recorded correctly before you 

switch on IOC mode during the flight. 

3 There is only one home point recorded at any time. This point is the same one used by Go-Home
©2012 DJI Innovations. All Rights Reserved. 31 | 

and Landing FailSafe.

4 In Control 1, when flying using home lock, if the GPS signal becomes weak, the MC will 

automatically switch to course lock using the current (not recorded) forward flight direction.

5 It is recommended that the pilot should be near the home point to use home lock, or near to the 

point of interest to use POI flight.

6 It is recommended to use a 3-position switch for X2 channel.

Note:

1 Before home lock flight, you’d better fly the multi-rotor out of the 10m range around home point, then 

slide X2 channel switch to Home Lock position to fly in home lock when all the requirements are 

met. If you have already slide X2 channel switch to Home Lock position when the multi-rotor is still 

in 10m range around home point, and this is the first time you are going to fly in home lock during 

the current flight, then if all the requirements are met, MC will change into home lock automatically

when multi-rotor flies out the 10m range around home point.

2 When the multi-rotor is flying in home lock at a distance away from you and the home point, please 

do not switch the X2 channel many times quickly, as this will change the recorded home point to the 

current location.

3 Avoid using POI in areas where the GPS signal might be lost or the TX / RX signal might be lost 

(such as built up urban areas)

4 By using a 3-position switch, if you want to record a new home point and point of interest manually, it 

is recommended to record them separately so as to make sure the recording is successful. Please 

pay attention to the following contents for correct recording.

 Control 1: DO NOT switch X2 channel between OFF and Home Lock position, but only between 

OFF and Course Lock, or Course Lock and Home Lock position. 

 Control 2: DO NOT switch X2 channel between OFF and POI position, but only between OFF

and Course Lock, or Course Lock and POI position.

 Control 3: DO NOT switch X2 channel between OFF and Home Lock position, but only between 

OFF and POI, or Home Lock and POI position. 

5 We suggest you use home lock in a limited area which is greater than 10m away from the home 

point; and use POI in a limited area greater than 5m (and less than 500m) away from the Point of 

Interest 

6 If there is poor GPS quality during the flight, then the M.C. may not give an accurate flight path for 

the radius around the point of interest.

7 Continuously spinning the multi rotor will accumulate yaw errors. The LED will blink to indicate 

huge cumulative yaw errors caused by spinning the craft continuously in IOC. In this case, you can 

stop or slow down the spinning, and continue flying after the blinking has stopped, so as to have 
©2012 DJI Innovations. All Rights Reserved. 32 | 

better flight performance.

8 When flying in Home Lock mode, if any of the following situations happen, then the system will quit 

Home Lock flying and automatically enter Course Lock flying.

 The aircraft fly’s within 10m range of the home point.

 You toggle the control mode switch to the ATTI. Mode.

 The GPS signal becomes bad (The GPS signal LED is blinking Red twice or three times).

Important, in the Course Lock flying we mentioned above, if the IOC switch is still at the HL position, 

the system will use a new forward direction (Example, Fig1) recorded at the moment, which is 

pointing from the home point to the aircraft when changing from Home Lock to Course Lock flying. 

However, if you toggle the IOC switch to the Course Lock, the aircraft will fly in Course Lock using a 

different forward direction, which was recorded previously (Example, Fig2).

new forward direction

Home Point

(related with the home point)

 

previous forward direction (nothing with the home point)

Fig.1 Fig.2
©2012 DJI Innovations. All Rights Reserved. 33 | 

5. Gimbal

STEP1: Gimbal Switch

If you use a gimbal, please select On here, and select an Output Frequency (50Hz/100Hz/200Hz/400Hz).

The chosen output frequency should not exceed the maximum servo supported frequency.

Note:

If you enable the gimbal control in the assistant software during the configuration, please note that there 

will be an output from the F1 and F2 ports. In this case you should not connect these ports to ESCs which 

are wired with propeller equipped motors.

Tips:

 If you want to use a gimbal with an Octo-rotor, you have to use an S-Bus/S-Bus2 or PPM receiver, 

then you can use port T and R for gimbal control. Otherwise, there will be no ports on the MC for 

gimbal control.

 WKM supports servo center of 1520us.

STEP2: Servo Travel Limit

Range: -1000 to+1000.

MAX/MIN are servo travel limits; adjust them to avoid mechanical binding; Place your multi rotor on level 

ground, adjust Center value of Pitch and Roll direction to set the camera to your desired angle-to-ground.

Notices:

 If servo expansion is used, which may enlarge the servo travel limit, make sure to reset your servo 

travel limit.
©2012 DJI Innovations. All Rights Reserved. 34 | 

STEP3: Automatic Control Gain 

Range: 0 to 100.

Adjust the reaction angle of automatic control. The initial value 100 is full angle. The bigger the gain, the 

bigger the reaction angle. Click REV/NORM, and then you can reverse the feedback control directions.

STEP4: Manual Control Speed 

Range: 0 to 100.

You should assign one of the knobs on your transmitter to the X3 channel for controlling the Pitch direction 

(angle) of the camera gimbal during flight. Then adjust the reaction speed of the pitch direction manual 

control; the initial value 100 is full speed.

When X3 is set as remote gain or for switch “go-home”, users can not adjust the gimbal pitch using the X3 

channel, while WKM still provides enhanced stability for the gimbal; the gimbal pitch and roll will return to the 

center position.

Note:

 If the X3 channel is used for controlling the Pitch of the gimbal, then the X3 cannot be used for 

remote gain tuning or Go-Home switch.
©2012 DJI Innovations. All Rights Reserved. 35 | 

6. Voltage Monitor

STEP1: Protection Switch

In order to prevent your multi-rotor from crashing or other harmful consequences caused by low battery 

voltage, we have designed two levels of low voltage protection. You can choose to not to use them, however 

we strongly recommend to enable the protection here!

Note:

 Make sure the two connections between the PMU and the MC (PW to CAN interface, V-SEN to X1) 

are correct; otherwise the low voltage protection will not work correctly.

 Both protections have LED warning as default. First level will blink yellow light continuously; 

second level will blink red light continuously.

 Both protections will only have LED warning under Manual Mode, NO AUTOMATIC functions.

 Low voltage conditions are NOT fun! You should land your multi-rotor ASAP on seeing any low 

voltage warning indication, to prevent your multi-rotor from crashing or other harmful consequences!

STEP2: Battery

Power the MC using your normal flight battery and connect the MC with a PC, the current battery voltage will 

be displayed in this column.
©2012 DJI Innovations. All Rights Reserved. 36 | 

If the battery voltage displayed here is different from the voltage you measure using

a voltmeter, you have to calibrate. Click the Calibration, enter the voltage you have 

just measured in the Calibration column of the dialogue box, and then click OK.

Meanwhile you need to select the battery type you are using, so that the MC can provide default warning 

voltages and ranges of warning voltages for you.

STEP3: First Level Protection

No Load (No Load Voltage): No load warning voltage. You need to enter this value.

Loss (Line Loss Voltage): The battery voltage drop during the flight. You need to enter this value.

Loaded (Loaded Voltage): The real-time battery voltage during the flight. This is the actual warning voltage 

monitored by the MC. Does not require your input, calculated by No Load and Loss.

Tips:

Voltage Magnitude Relation:

 No Load: First level > Second level.

 Loss: First level = Second level.

 Loaded: Calculated, First level > Second level.

Method of Acquiring Line Loss Voltage:

1 Make sure you can fly your multi-rotor normally with a fully charged battery.

2 Use a fully charged battery, switch on the low voltage protections in assistant software, and observe

the current voltage. Enter a reasonable warning voltage in the No Load of first protection (We 

recommend to enter a voltage 1V lower than the current voltage and higher than the minimum 

battery voltage rating). Enter 0V for the Loss at the moment.

3 Fly the multi-rotor until the first level protection is triggered, and the LED is flashing yellow. Now land 

your multi-rotor ASAP.

4 Connect the MC to PC, open the assistant software and read the current voltage. The Loss (Line 

loss voltage) is the difference between the new current voltage and the first level No Load voltage 

you filled in.
©2012 DJI Innovations. All Rights Reserved. 37 | 

Note:

 If the line loss voltage of a battery is over 0.3V per cell (e.g. 3S battery over 0.9V), it’s because the 

internal resistance of the battery is high or the battery is old, we suggest you replace it!

 Generally the line loss voltage of different batteries is different. For the consideration of safety, we 

recommend that you acquire all the line loss voltages of all the batteries you intend to use, and enter

the lowest value for the Loss.

 When you change the payload or multi-rotor, you have to obtain the new line loss voltage.

 The line loss voltage will be higher after many flights; you should obtain a new value after charging 

30 times.

 Make sure your ESCs protection voltage is lower than 3.1V (1S), otherwise the WKM low voltage 

protection will not work.

1 Acquire the line loss voltage by the method above, and enter the value.

2 Enter a reasonable warning voltage in the No Load.

3 Choose a safeguard method: 1) LED warning: This is the default safeguard when you switch on the low 

voltage protection; 2) Go Home and Landing: This safeguard will NOT be triggered if any of the 

following conditions are true:

a) Manual or Atti. Mode;

b) GPS signal is not good;

c) The distance between the Home Location and multi-rotor is less than 25m, and the altitude is 

lower than 20m relative to the Home Location. Here the recorded Home Location is the same as 

the one used for Enhanced FailSafe. Please refer to Enhanced FailSafe in “Autopilot”.

Note:

 There will be a 4 second LED warning before Go Home.

 If you switch to Manual or Atti. Mode during Go Home, you will regain the control. LED warning will 

be still on, please land ASAP.

 If you switch back into the GPS Mode when you are in first level protection, you will have 15s time to 

control your multi-rotor, you should land ASAP in this 15s to prevent your multi-rotor from crashing

or other harmful consequences! After this time if the Go Home and landing requirements are 

satisfied, the multi-rotor will Go Home and Land automatically.

 If you choose LED warning, please land ASAP after you see the LED warning to prevent your 

multi-rotor from crashing or other harmful consequences!

 Compare the Go Home and Landing of low voltage protection and the Go Home and Landing in 

Enhanced Failed-safe, the recording of the Home Location are the same; the Go Home routes are 

the same; the difference is that there is no hovering before landing in low voltage protection.
©2012 DJI Innovations. All Rights Reserved. 38 | 

STEP4: Second Level Protection

1 Fill the warning voltage and line loss voltage in No Load and Loss, using the method introduced in 

previous steps.

2 When the second level protection is triggered, the LED warning will be on. Meanwhile the center point 

of the throttle stick will move up slowly to 90% of endpoint, you should land ASAP to prevent your 

multi-rotor from crashing or other harmful consequences!

3 When the throttle center point is at 90% of endpoint, the multi-rotor will still ascend slowly if you 

continue to raise the throttle stick, and the control of Pitch, Roll and Yaw are the same as before. 

Please land ASAP to prevent your multi-rotor from crashing or other harmful consequences!

Note:

If your multi-rotor goes into the second level protection during Go Home in the first level protection, it will 

land immediately. If you switch into Manual or Atti. Mode, you will regain the control, and the center point 

of the throttle stick will move up slowly to 90% of endpoint. Please land ASAP to prevent your multi-rotor 

from crashing or other harmful consequences!
©2012 DJI Innovations. All Rights Reserved. 39 | 

Flight

Digital Compass Calibration

Why calibrate the compass?

Ferromagnetic substances placed on the multi rotor or around its working environment will affect the reading 

of magnetic earth for the digital compass, it also reduces the accuracy of the multi rotor control, or even reads 

an incorrect heading. Calibration will eliminate such influences, and ensure the MC system performs well in a 

non-ideal magnetic environment.

When to do it?

 The first time you install WKM on your multi rotor.

 When the multi rotor mechanical setup is changed:

a) If the GPS/Compass module is re-positioned.

b) If electronic devices are added/removed/ re-positioned (Main Controller, servos, batteries, etc).

c) When the mechanical structure of the multi rotor is changed.

 If the flight direction appears to be shifting (meaning the multi rotor doesn’t “fly straight”).

 The LED indicator often indicates abnormality blinking when the multi rotor yaws. (It is normal for this to 

happen occasionally.)

Note:

 Don’t calibrate your compass where there is strong magnetic interference, such as magnetite, car 

park, and steel reinforcement under the ground.

 DO NOT carry ferromagnetic materials with you during calibration, such as keys or cell phones.

 You don’t need to rotate your multi rotor on a precise horizontal or vertical surface, but keep at least 

45° difference between horizontal and vertical calibration.

 The MC cannot work in the polar circle.

Calibration procedure

STEP1: Enter calibration mode: quickly switch the control mode switch from Manual Mode to GPS Atti. 

Mode and back to Manual Mode for 6 to 10 times, The LED indicator will turn on constantly 

blue;

STEP2: Calibration in horizontal: rotate your multi rotor along the horizontal axis until the LED changes 

to constant green, then go to the next step;

STEP3: Calibration in vertical: while the LED is green, hold your multi rotor vertically and rotate it along 
©2012 DJI Innovations. All Rights Reserved. 40 | 

with its vertical axis, keep rotating until the LED turns off, meaning the calibration is finished.

STEP4: After you finished the calibration, The LED indicator will show whether the calibration was

successful or not:

 If the LED turns on white for 3 seconds, then the calibration was successful, calibration mode 

will exit automatically.

 If the LED quickly flashes red, the calibration has failed. Switch the control mode switch one 

time to cancel the current calibration, and then re-start from step 1 for re-calibration.

Tips:

If you keep having calibration failure, it might suggest that there is very strong magnetic interference 

around the GPS & Compass module, please avoid flying in this area.
©2012 DJI Innovations. All Rights Reserved. 41 | 

Test Flying

Before First Flight

Note:

 Make sure you have assembled your multi rotor correctly.

 Make sure you have done the configuration procedure correctly.

 Any of the following may lead to a possible dangerous accident if incorrect, double check all these 

items:

 Rotation direction of all motors is correct

 Propellers are installed correctly and on the correct motors

 IMU installation is correct

 All Connections are correct, including between the MC and ESC

 In Atti and GPS Atti mode, throttle stick center position is for 0m/s in the vertical direction. If you 

lower the throttle stick to the bottom during the flight, the multi-rotor will descend; If you lower the 

stick to the bottom on the ground, it will stop the motors after 3 seconds. However, slow spinning 

motors will affect the flight performance; we advise to keep the throttle stick position higher than 

10% during the flight! In Manual Mode it will stop the motors when the throttle stick is below 10%.

 Make sure you switch on the transmitter first, then power on the multi-rotor! (Power off the 

multi-rotor first then switch off the transmitter, after landing!)

 Please carry out the test flights and gain adjustment with Atti. Mode in an open area without a heavy 

wind! Please read the first step of Autopilot in Configuration to learn how to adjust the gains.

Flying

STEP1: Make sure your batteries are fully charged for your transmitter, the MC and all the devices on 

your multi rotor;

STEP2: Check all connections and wiring, and make sure they are in good condition and secure

STEP3: Switch on the transmitter first, then power on your multi-rotor!

STEP4: Switch the control mode switch on your transmitter, and make sure it is working properly. 

Check using the LED indicator to specify the current working mode for the MC. See Appendix for 

details about LED indicator;

STEP5: Switch the controller to Atti. Mode. Use any safe method to do the following test: Increase

the throttle to 20% slowly within 3 seconds after executing CSC and make sure all the motors are 

working, and then try to move the transmitter sticks lightly in Roll, Pitch and Yaw to feel if your multi 

rotor moves in the corresponding direction. If not, go back to the Configuration Procedure and 

correct your settings.
©2012 DJI Innovations. All Rights Reserved. 42 | 

Tips:

After a successful test flight, the preparation before taking off can be simplified: Put your multi rotor on 

level ground, turn on the transmitter first, power on the multi rotor, when the LED light starts to blink 

normally, you can take off in Atti. Mode.
©2012 DJI Innovations. All Rights Reserved. 43 | 

Flying with GPS

Before Flying with GPS

Note:

 When the system is powered on, you must not move your multi rotor or sticks on the transmitter until 

the system initialization is finished (about 5 second).

 Make sure the GPS signal is good, without red blinking LED. Otherwise the multi rotor will drift without

stick commands.

 Please avoid using the MC system in the following areas, where the GPS signal is most likely weak or 

totally obstructed:

 Built-up Urban area with many buildings

 Tunnels

 Under bridges

Tips:

Should you find the multi-rotor does not fly straight in forward flight, you might need to re-mount the GPS 

module in an offset angle as shown in the diagram below. Θ in the diagram is the offset angle.

Objective flight direction GPS mounting direction

GPS mounting direction Actual flight direction Objective flight direction

Actual flight direction

1 2 3

θ

θ

Without GPS offset angle With GPS offset angle
©2012 DJI Innovations. All Rights Reserved. 44 | 

Enhanced Features

Attitude Control When One Motor Output Has Failed

This feature is for Hexa-rotor, including Hexa-rotor I, Hexa-rotor V, Hexa-rotor IY and Hexa-rotor Y.

The WKM can still control the attitude of the Hexa-rotor for a safe landing when one motor output of the 

Hexa-rotor has failed, for example, one motor is stopped or one propeller is broken, etc.

The control mode of WKM should be in Atti. Mode or GPS Atti. Mode. The aircraft will rotate, due to an 

imbalance of torque; however, it can still be controlled by the TX.

Select Course lock or home lock mode for flying the aircraft into a safe area to land when the aircraft is far 

away or the attitude can’t be recognized. Even when the multi rotor is rotating, using Course lock or home 

lock mode will allow you to move the multi rotor in the corresponding Tx stick direction.

Flight Limits Setting

Height Limit

If height restriction is needed, please turn to the “Tool” tab of the assistant software. Click ON and write a 

value (Range: 20~300m) to the Max Height box, so that the aircraft flight height will not higher than the 

max-height in any control mode (Manual/ATTI./GPS ATTI. Mode). However, the FailSafe and the Ground 

Station operation are not restricted to this height limit. If no height limit is needed, please click OFF.

Distance Limit

If distance restriction is needed, please turn to the “Tool” tab of the assistant software. Click ON and write a 

value (Range: 30~500m) in the Max Radius box, so that the distance from the aircraft to the Home-point will 

not be longer than the max-radius you set. The Distance Restriction function ONLY works in GPS ATTI. Mode. 

The aircraft may fly out of the restriction when emergency brake is carried out at the border (the buffer zone is 

about 10m), if it flies out of the restricted distance the Control Mode LED will blink Cyan. However, the 

FailSafe and the Ground Station operation are not restricted to this distance limit. If no distance limit is 

needed, please click OFF.

However, the FailSafe and the Ground Station operation are not restricted to this distance limit. If no distance 

limit is needed, please click OFF.
©2012 DJI Innovations. All Rights Reserved. 45 | 

Fix the TBE (Toilet Bowl Effect) Problem

When flying in GPS ATTI. Mode and the compass calibration has been done correctly, should you find the 

aircraft rotating (Toilet bowl effect), or drifting when hovering. Please check the GPS module mounting 

orientation and then re-do the compass calibration. Carry out the following procedure to re-mount the GPS 

module.

In the following diagram (view from the top), the aircraft can appear to be rotating in both clockwise and 

counter-clockwise direction, please re-mount the GPS module correspondingly.

is the rotating direction of aircraft, is the nose direction of aircraft, 

is the arrow direction on the GPS module, θ is the offset angle for GPS re-mounting(about 10~30o)

Clockwise rotating GPS re-mounting

θ

Counter Clockwise rotating GPS re-mounting

θ
©2012 DJI Innovations. All Rights Reserved. 46 | 

Appendix

Customize Motor Mixer

For a multi rotor, the roll, pitch, yaw and vertical axes are contributed by the combination of rotors’ outputs. 

This procedure is called Mix Control. The proportion of rotors’ outputs is decided by the mechanical structure. 

Customers can setup the motor output coefficients C in Motor Mixer  Customize so as to realize the Mix 

Control.

Before customization, you should following knowledge:

1. Motor output = C ×Stick position (A or E or T or R).

Torque produced by motor = Motor output ×Force arm of motor (L) = C ×Stick position (A or E or T or 

R) ×L

2. The range of C is from -100% to 100%. Maximum C in the same column is 100%. The bigger 

absolute value of C, The great effect of stick position on motor output. Stick position will not 

affect motor output when C is 0, which means the motor output is fixed.

3. Each motor has four different output coefficients: CT, CY, CP, CR. E.g. CY2 represents coefficient of M2 

in yaw control; CR5 represents coefficient of M5 in roll control.

4. Motor output is relative to its rotation speed. The bigger output, the faster rotation speed. Negative 

output does not represent counter rotation, but slower rotation speed. Motor is still spinning if its output 

is 0.

5. Throttle stick position (T): Pull stick T<0, multi-rotor moves down; Push stuck T>0 multi-rotor moves up;

Rudder stick position (R): Stick left R<0, multi-rotor nose left; Stick right R>0, multi-rotor nose right;

Elevator stick position (E): Pull stick E<0 multi-rotor moves backward; Push stuck E>0, multi-rotor moves 

forward;

Aileron stick position (A): Stick left A<0, multi-rotor moves left; Stick right A>0, multi-rotor moves right.

6. Multi-rotor should keep balance along all the other axes when moves along one axis:

 To keep throttle direction balance, sum of all motors’ output should be 0 when apply 

rudder or pitch or roll stick command;

 To keep yaw direction balance, sum of counter clockwise motors’ output should be 

equal to sum of clockwise motors’ output when apply throttle or pitch or roll stick 

command;

 To keep pitch direction balance, total torques produced by motors at each side of pitch 

axis should be the same when apply throttle or rudder or roll stick command;

 To keep roll direction balance, total torques produced by motors at each side of roll axis
©2012 DJI Innovations. All Rights Reserved. 47 | 

should be the same when apply throttle or rudder or pitch stick command。

7. To pitch or roll control, proportion of coefficients of the motors at the same side of pitch or roll axis 

should be equal to the proportion of force arms of those motors: Cm/Cn = Lm/Ln; Coefficient is 0% 

if the force arm of that motor is 0.

M2 M1

M1

M4 M5

M3 M6

M2 M1

M3

M4 M5

M6

Roll Axis

Pitch Axis

Yaw Axis

d

2d a a

Now we take the Hexa-rotor V as an illustration to introduce how to customize motor mixer. 

Throttle

Usually, we want push the throttle stick to ascend the multi-rotor; pull the throttle stick to descend the 

multi-rotor; put the throttle stick at center point to hover the multi-rotor. We also want multi-rotor to keep 

balance along all the other axes when apply the throttle stick command:

{

(CT1 + CT3 + CT5) × T = (CT2 + CT4 + CT6) × T (To keep yaw direction balance)

(CT1 + CT2) × T × a = (CT4 + CT5) × T × a (To keep pitch direction balance)

(CT2 + CT4 + 2CT3) × T × d = (CT1 + CT5 + 2CT6) × T × d (To keep roll direction balance)

1

As we defined before: Pull stick T<0, multi-rotor moves down; Push stuck T>0 multi-rotor moves up, we can 

choose the following setup:

M2 M1

M1

M4 M5

M3 M6

M2 M1

M3

M4 M5

M6

Roll Axis

Pitch Axis

Yaw Axis

d

2d a a

Now if push the throttle stick, the sum of all motors output (CT1 + CT2 + CT3 + CT4 + CT5 +CT6)×T is positive, 

then multi-rotor moves up; pull the throttle stick, the sum of all motors output (CT1 + CT2 + CT3 + CT4 + CT5

+CT6)×T is negative, then multi-rotor moves down. And the balance along all the other axes can be derived by

substituting the throttle stick command into equations set 1.
©2012 DJI Innovations. All Rights Reserved. 48 | 

Yaw

The movement about yaw axis is produced by the counter torque force from the rotation of propeller. In our 

example, M1 M3 M5 produce clockwise torque force; M2 M4 M6 produce counter clockwise torque force. 

When the hexa-rotor is hovering, all the rotors are spinning at the same angular velocity, which means the 

clockwise torque force equals to counter clockwise torque force, and this produces exactly 0 angular 

acceleration about yaw axis. Therefore, when the rotate speed of M1 M3 M5 is larger than M2 M4 M6, 

hexa-rotor spins clockwise; when the rotate speed of M1 M3 M5 is smaller than M2 M4 M6, hexa-rotor spins 

counter clockwise. We also want multi-rotor to keep balance along all the other axes when apply the yaw stick 

command:

{

(CR1 + CR2 + CR3 + CR4 + CR5 + CR6) × R = 0 (To keep throttle direction balance)

(CR1 + CR2) × R × a = (CR4 + CR5) × R × a (To keep pitch direction balance)

(CR2 + CR4 + 2CR3) × R × d = (CR1 + CR5 + 2CR6) × R × d (To keep roll direction balance)

2

As we defined before: Stick left R<0, multi-rotor nose left; Stick right R>0, multi-rotor nose right, we can 

choose the following setup:

M2 M1

M1

M4 M5

M3 M6

M2 M1

M3

M4 M5

M6

Roll Axis

Pitch Axis

Yaw Axis

d

2d a a

Now if move the yaw stick right, the sum of M1, M3, M5 output (CR1 + CR3 + CR5) ×R is positive, the sum of M2, 

M4, M6 output (CR2 + CR4 + CR6) ×R is negative, then the clockwise torque force is larger than counter 

clockwise torque force, multi-rotor nose right; if move the yaw stick left, the sum of M1, M3, M5 output (CR1 + 

CR3 + CR5) ×R is negative, the sum of M2, M4, M6 output (CR2 + CR4 + CR6) ×R is positive, then the clockwise 

torque force is smaller than counter clockwise torque force, multi-rotor nose left. And the balance along all the 

other axes can be derived by substituting the yaw stick command into equations set 2.

Pitch

The movement about the pitch axis is produced by the differential output of M1+M2 and M4+M5. Since M3 

and M6 are on the pitch axis, they do not contribute and torque. You can just keep the rotation speed of M3 

and M6 the same as hovering, so CP3 and CP6 are 0. Increase output of M4, M5 and decrease output of M1, 

M2, multi-rotor moves forward; decrease output of M4, M5 and increase output of M1, M2, multi-rotor moves 

backward. We also want multi-rotor to keep balance along all the other axes when apply the pitch stick 
©2012 DJI Innovations. All Rights Reserved. 49 | 

command:

{

(CE1 + CE2 + CE3 + CE4 + CE5 + CE6) × E = 0 (To keep throttle direction balance)

(CE1 + CE3 + CE5) × E = (CE2 + CE4 + CE6) × E (To keep yaw direction balance)

(CE2 + CE4 + 2CE3) × E × d = (CE1 + CE5 + 2CE6) × E × d (To keep roll direction balance)

3

Also proportion of coefficients of the motors at the same side of pitch axis should be equal to the proportion of 

force arms of those motors: CE1∶ CE2 = CE4∶ CE5 = a: a = 1: 1. As we defined before: Pull stick E<0

multi-rotor moves backward; Push stuck E>0, multi-rotor moves forward, we can choose the following setup:

M2 M1

M1

M4 M5

M3 M6

M2 M1

M3

M4 M5

M6

Roll Axis

Pitch Axis

Yaw Axis

d

2d a a

Now if push the pitch stick, the sum of M1, M2 output (CE1 + CE2) ×E is negative, the sum of M4, M5 output 

(CE4 + CE5) ×E is positive, then multi-rotor moves forward; if pull the pitch stick, the sum of M1, M2 output (CE1

+ CE2) ×E is positive, the sum of M4, M5 output (CE4 + CE5) ×E is negative, then multi-rotor moves backward. 

And the balance along all the other axes can be derived by substituting the pitch stick command into 

equations set 3.

Roll

The theory of movement about the roll axis is the same with pitch axis. However there is no motor on the axis 

in this case, no coefficient is 0%. We also want multi-rotor to keep balance along all the other axes when 

apply the roll stick command:

{

(CA1 + CA2 + CA3 + CA4 + CA5 + CA6) × A = 0 (To keep throttle direction balance)

(CA1 + CA3 + CA5) × A = (CA2 + CA4 + CA6) × A (To keep yaw direction balance)

(CA1 + CA2) × A × a = (CA4 + CA5) × A × a (To keep pitch direction balance)

4

Also proportion of coefficients of the motors at the same side of roll axis should be equal to the proportion of 

force arms of those motors: CE2∶ CE3∶ CE4 = CE1∶ CE6∶ CE5 = d: 2d: d = 1: 2: 1. As we defined before: Stick left 

A<0, multi-rotor moves left; Stick right A>0 multi-rotor moves right, we can choose the following setup:
©2012 DJI Innovations. All Rights Reserved. 50 | 

M2 M1

M1

M4 M5

M3 M6

M2 M1

M3

M4 M5

M6

Roll Axis

Pitch Axis

Yaw Axis

d

2d a a

Now if move the roll stick right, the sum of M2, M3, M4 output (CA2 + CA4 + 2CA3) ×A is positive, the sum of M1, 

M5, M6 output (CA1 + CA5 + 2CA6) ×A is negative, then multi-rotor moves right; if move the roll stick left, the 

sum of M2, M3, M4 output (CA2 + CA4 + 2CA3) ×A is negative, the sum of M1, M5, M6 output (CA1 + CA5 + 2CA6)

×A is positive, then multi-rotor moves left. And the balance along all the other axes can be derived by 

substituting the roll stick command into equations set 4.

Summary

1. Once you choose to customize, all coefficients are configurable. However, you only have to setup as 

many as you need. Leave the rest 0%.

2. Make sure you are clear about the definition of the positive and negative. Make sure you are also clear 

about the relationship between the output quantity and motor rotation speed.

3. Usually, the coefficients of throttle and yaw are 100% or -100%. The rest of the coefficients should be 

decided by the proportion of force arms of the motors.

4. The method introduced in this section is only suitable for central symmetry multi rotor.
©2012 DJI Innovations. All Rights Reserved. 51 | 

Multi-Rotors Supported

For coaxial propellers: Blue propeller is at Top; Red propeller is at Bottom. Otherwise all propellers are at top.

M1

M2 M4

M3

M1

M3 M4 M5

M6 M2 M1

M1

M4 M5

M3 M6

M1,4

M2,5 M3,6

M2

M2 M1

M3

M4 M5 M6

M8

M7

M2 M1 M3

M4

M5 M6

M7

M8

M2,5

M1,4

M3,6

M2,6 M1,5

M3,7 M4,8

I6

X4

X6

IY6 Y6

I8 X8

I4

V8

M2 M1

M3 M4
©2012 DJI Innovations. All Rights Reserved. 52 | 

Port Description

Main Controller

A

For roll control (left/right)

E

For pitch control (front/back)

T

For throttle control Or to gimbal roll servo

R

For rudder control Or to gimbal pitch servo

U

For Control Mode Switch

X1

For voltage monitor (Connect with PMU V-SEN port)

X2

For D-Bus (S-Bus/S-Bus2 compatible) Or for gain tuning Or for IOC switch

X3

For gimbal pitch control Or for gain tuning Or for switch go-home

M6

To #6 rotor

M5

To #5 rotor

M4

To #4 rotor

M3

To #3 rotor

M2

To #2 rotor

M1

To #1 rotor

F2

To gimbal pitch servo Or to #8 rotor

F1

To gimbal roll servo Or to #7 rotor

Micro-B USB port: PC connection for configuration and firmware upgrades.

CAN-Bus port: MC uses CAN-Bus to power and communicate with other WKM modules.

(In three-pin ports, pins near the nicks are signal pins.)

Power Management Unit

V-SEN For monitoring battery voltage and supplying power to receiver and other electronic 

devices. (Connect with MC X1 port)

 White wire (signal wire) output: ±3.3V

 Red wire (power wire) output: 3A@5V

PW For supplying power to WKM system.

 Output: Max 2A@12.6V 
©2012 DJI Innovations. All Rights Reserved. 53 | 

LED Description

Flight States

Manual Mode Atti. Mode GPS Atti. Mode IOC Tx Signal Lost

GPS satellites < 5

GPS satellites < 6

GPS satellites < 7

Attitude & GPS good

Attitude status fair

Attitude status bad

IMU data Lost

Flashing indications of , , are: Single flash, all the Tx sticks are at center position, multi rotor 

hovering; Double flash, Tx stick(s) not at center position, speed command is not zero.

Compass Calibration

Begin horizontal calibration

Begin vertical calibration

Calibration finished 3 seconds

Calibration or others error

Low Voltage Warning

First level protection

Second level protection

Successful Recording

Every time the aircraft records a home-point successfully

Manually or Automatically Recording is successful

in Couse Lock and POI flying

Main Controller LED

MC is functioning correctly.

Boot loader mode, MC is waiting for firmware upgrade.

Firmware upgrade has finished. MC is waiting for reboot.

Error occurred during firmware upgrade, MC reboot is required. or

PMU LED

PMU connection is correct.

Connection between PMU and battery is wrong (polarity error).
54

Recommended Setting

No. Aircraft

Configuration Information Basic Gain Attitude Gain

Motor ESC Propeller Battery Weight Pitch Roll Yaw Vertical Pitch Roll

1 F450 DJI-2212 DJI-30A DJI-8 Inch 3S-2200 1070 g 155 155 125 150 165 165

2 F550 DJI-2212 DJI-30A DJI-8 Inch 4S-3300 1640 g 170 170 150 140 170 170

3 S800 DJI-4114 DJI-40A

DJI-15 Inch 

Carbon

6S-15000 4770 g 200 200 195 175 190 190

4

S800&Z15

&Camera

DJI-4114 DJI-40A

DJI-15 Inch 

Carbon

6S-10000 6100 g 240 240 200 200 220 220
55

Specifications

General

Built-In Functions  Three Modes Autopilot

 PPM Receiver Supported

 2-axle Gimbal Support

 Enhanced Fail Safe

 S-Bus/S-Bus2 Receiver Supported

 Intelligent Orientation Control

 Multi Output Frequency Supported

 Low Voltage Protection

Peripheral

Supported Multi-rotor  Quad-rotor: I4, X4;

 Hexa-rotor: I6, X6, Y6, IY6;

 Octo-rotor: X8, I8, V8.

Supported ESC output 400Hz refresh frequency.

Recommended Transmitter Only PCM or 2.4GHz with minimum 7 channels and

FailSafe function available on all channels.

Recommended Battery 2S ~ 6S LiPo

Assistant Software System Requirement Windows XP SP3 / 7

Electrical & Mechanical

Power Consumption MAX 5W 

(0.9A@5V, 0.7A@5.8V, 0.5A@7.4V, 0.4A@8V)

Operating Temperature -5°C to +60°C

Total Weight <= 118g (overall)

Dimensions  MC: 51.2mm x 38.0mm x 15.3mm

 IMU: 41.4mm x 31.1mm x 27.8mm

 GPS & Compass: 50mm (diameter) x 9mm

 LED Indicator: 25mm x 25mm x 7mm

 PMU: 39.5mm×27.5mm×9.7mm

Flight Performance (can be effected by mechanical performance and payloads)

Hovering Accuracy (GPS Mode)  Vertical: ± 0.5m

 Horizontal: ± 2m

Maximum Wind Resistance <8m/s (17.9mph / 28.8km/h)

Max Yaw Angular Velocity 150deg/s

Max Tilt Angle 35°

Ascent / Descent ±6m/s