Appendix(F

LandBros(Aerial(Photography,(L.L.C.

S900(&(A2(Flight(Controller(

Specifications
S900 Product Release Notes

©2014 DJI Innovations. All Rights Reserved.

Date : August 4, 2014 

S900 User Manual Version : 1.00 

S900 ESC Firmware Version : 3.6 

 

August 4, 2014 DJI Spreading Wings S900

S900 Overview

1. Safe and stable

(1) The S900’s V-type mixer design provides large amounts of propulsion while improving power efficiency. 

Combined with DJI flight controllers like the A2, it is guaranteed to remain stable even with the loss of a 

rotor.

(2) A more reliable, safe, and simplified power wiring system is easy to setup, and eliminates the need for 

soldering. The main power cord uses an AS150 spark-proof plug and an XT150 plug, preventing creators from 

mixing up polarity when plugging in the battery, and also helping prevent short circuits.

(3) All frame arms and the retractable landing gear are made from carbon fiber, ensuring light weight and high 

structural stability.

 

2. Professional hexacopter 

(1) Weighing approximately 3.3kg with a maximum takeoff weight of about 8.2kg, the S900 can easily carry 

equipment such as the Zenmuse gimbal systems and a set of shooting equipment. Used with a 6S 15000mAh 

battery it can fly for up to 18 minutes. 

(2) The gimbal is mounted low on the frame on a specifically designed bracket. When combined with our 

retractable landing gear, you have very wide range of possible shooting angles. 

(3) The gimbal and battery are mounted to the same bracket, with dampers placed between the bracket and the 

frame. This significantly reduces high-frequency vibrations and makes shots clearer and sharper. The battery 

tray's position also makes it more stable and convenient for mounting and dismounting. 

(4) The S900 supports most of the Zenmuse series of gimbals. (The Z15-5D gimbal is not currently supported by 

the S900. Please use the S1000 platform when using the Z15-5D.)

3. Portable and easy to use 

(1) All six arms can be folded down, and the 1552 folding propellers can be tucked away, minimizing the S900’s 

size during transport. 

(2) To fly, simply lift the frame arms up, lock them in place with the red clips, and power up the system. This 

greatly saves on pre-flight prep time and you can be ready to fly in less than 5 minutes. 

(3) The upper center plate can be removed quickly, making it convenient and efficient to arrange or change the 

power system, control system, and other accessories. 

 

4. Easy to control and fly 

(1) Each frame arm is designed with an 8° inversion and a 3° inclination, making the aircraft more stable when 

rolling and pitching, and more flexible when rotating. 

(2) Each frame arm has a built-in 40A electronic speed controller (ESC). When combined with the 4114 pro motor 

and high performance 1552 folding propellers, the S900 is capable of a maximum thrust of 2.5Kg. 
S900 Product Release Notes

©2014 DJI Innovations. All Rights Reserved.

New Product Specification

Frame 

Diagonal Wheelbase 900mm

Frame Arm Length 358mm

Frame Arm Weight 

(with Motor, ESC, Propeller ) 316g

Center Frame Diameter 272mm

Center Frame Weight (with Landing Gear 

Mounting Base, Servos) 1185g

Landing Gear Size 460mm(Length)×450mm(Width)×360mm(Height) 

Motor 

Stator Size 41×14mm

kV 400rpm/V

Max Power 500W

Weight (with Cooling Fan) 158g

ESC 

Working Current 40A

Working Voltage 6S LiPo

Signal Frequency 30Hz ~ 450Hz

Drive PWM Frequency 8KHz

Weight (with Radiators) 35g

Foldable Propeller (1552/1552R) 

Material High strength performance engineered plastics

Size 15×5.2 inch

Weight 13g

Flight Parameters 

Takeoff Weight 4.7Kg ~ 8.2Kg

Total Weight 3.3Kg

Power Battery LiPo (6S, 10000mAh ~ 15000mAh, 15C(Min))

Max Power Consumption 3000W

Hovering Power Consumption 1000W (@6.8Kg Takeoff Weight)

Hovering Time 18min (@12000mAh & 6.8Kg Takeoff Weight)

Working Environment Temperature -10°C ~ 40°C
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 1

Date : May 29th, 2015 

A2 Controller Unit Firmware Version : 2.5 

A2 IMU Firmware Version : 2.5 

A2 GPS PRO Firmware Version : 2.6 

A2 GPS Module Firmware Version : 2.6 

A2 Receiver Firmware Version : 1.1 

A2 LED Firmware Version : 2.1 

A2 Assistant Software Version for PC : 1.8 

DJI Assistant App Version for iOS Device : 1.1.24 

iOSD Mark II Firmware Version : 3.02 

PC Ground Station : 4.0.11 

iPad Ground Station : 1.4.62 

A2 User Manual Version : 1.22 

 

Updates: 

 

Software 

z Fixed issue of the Motor Test Function automatically triggering when DJI Assistant v1.6 is connected to the A2 flight 

controller with firmware v2.3 or earlier.

Notes: 

(1) DJI Assistant iOS version v1.1.24 has the same problem, but will be fixed in version v1.1.26 very soon.
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 2

Date : May 8th, 2015 

A2 Controller Unit Firmware Version : 2.5 

A2 IMU Firmware Version : 2.5 

A2 GPS PRO Firmware Version : 2.6 

A2 GPS Module Firmware Version : 2.6 

A2 Receiver Firmware Version : 1.1 

A2 LED Firmware Version : 2.1 

A2 Assistant Software Version for PC : 1.6 

DJI Assistant App Version for iOS Device : 1.1.24 

iOSD Mark II Firmware Version : 3.02 

PC Ground Station : 4.0.11 

iPad Ground Station : 1.4.62 

A2 User Manual Version : 1.22 

 

Updates: 

 

Firmware

z Added support for Zenmuse gimbal channel control, allowing users to control the aircraft and gimbal using a single remote. 

z Modified Home Lock control mode that creates a no-fly zone of 10m radius around Home Point. This is to prevent the pilot from 

becoming disorientated. 

z Added data recording for GNSS coordinates and aircraft attitude. Use the latest iOSD Data Viewer to export this data for postprocessing.

z Fixed PC ground station display and waypoint related issues.

z Changed the default action for the first level voltage alarm from a flashing light to RTH.

z Fixed heading problem during initialization when using the GPS-COMP-PRO-PLUS module.

Software 

z Added a Zenmuse channel page to the PC Assistant.

z Display GPS SNR Health and SNR Fluctuation status in the DJI Assistant and iPad Ground Station. 

User Manual 

z Added information on connecting the gimbal to the CAN2 port and relevant channel mapping.

z Added description of GPS SNR Health and SNR Fluctuation.

Notes: 

(2) The gimbal’s firmware should be updated as below:

a) H3-3D GCU V1.12 or above,

b) Z15-5D GCU V2.4 or above, IMU V1.8 or above,

c) Z15-5D II GCU V2.4 or above, IMU V1.8 or above,

d) Z15-GH3 GCU V2.4 or above, IMU V1.8 or above,

e) Z15-GH4 GCU V2.4 or above, IMU V1.8 or above,

f) Z15-BMPCC GCU V2.4 or above, IMU V1.12 or above,

g) Z15-5N, Z15-GH2, Z15-7N and Z15-5R do not support connection with CAN2 port.

(3) Backup parameters before each upgrade since the parameters may be reset during upgrade. When upgrade is complete, check the 

configuration of A2 controller unit then unlock the controller unit in A2 Assistant.

(4) Once upgraded, calibration parameters saved in the A2 controller unit will be cleared. Recalibrating the IMU and the compass is 

required.
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 3

(5) Use with the latest version of the DJI A2 Assistant Software, Ground Station and gimbal firmware.
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 4

Date : November 14th, 2014 

A2 Controller Unit Firmware Version : 2.4 m1 

A2 IMU Firmware Version : 2.4 

A2 GPS PRO Firmware Version : 2.6 

A2 GPS Module Firmware Version : 2.6 

A2 Receiver Firmware Version : 1.1 

A2 LED Firmware Version : 2.1 

A2 Assistant Software Version for PC : 1.4 

DJI Assistant App Version for iOS Device : 1.1.21 

iOSD Mark II Firmware Version : 3.02 

PC Ground Station : 4.0.11 

iPad Ground Station : 1.4.59 

A2 User Manual Version : 1.2 

 

What is new? 

 

Firmware 

z Removed fast start-up feature for self-tightening propellers.

z Solved the problem that the assistant software fails to cancel the flight limit in some airports.

z Improved GNSS positioning threshold to enhance the initial positioning stability.

z Optimized integrity monitoring for satellite receiver.
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 5

Date : November 7th, 2014 

A2 Controller Unit Firmware Version : 2.4 

A2 IMU Firmware Version : 2.4 

A2 GPS PRO Firmware Version : 2.4 

A2 GPS Module Firmware Version : 2.4 

A2 Receiver Firmware Version : 1.1 

A2 LED Firmware Version : 2.1 

A2 Assistant Software Version for PC : 1.4 

DJI Assistant App Version for iOS Device : 1.1.21 

iOSD Mark II Firmware Version : 3.02 

PC Ground Station : 4.0.11 

iPad Ground Station : 1.4.59 

A2 User Manual Version : 1.2 

 

What is new? 

 

Firmware 

z New “Cruise Control” feature where the aircraft will lock into its current horizontal speed when users release the control sticks. The 

cruise speed can be adjusted by the remote control at any time.

z New “Banked Turn” mode. The roll and yaw sticks are combined to help perform banked turns.

z Added a “Home Fence” feature that prevents the aircraft from entering the area directly around the Home point.

z Support for F-Channel and Action settings in the DJI PC Ground Station. 

z Support for the Dropsafe system. 

z Added the ability to control the aircraft during Return To Home procedures. 

z Emergency position of the mode switch is set to Atti. Mode by default instead of Manual Mode.

z Added flight limits and airport No-Fly Zones. 

z Obtain initial receiver coordinates more quickly, in cold starts, low satellite signal (foliage/canopy).

z Greater satellite tracking reliability in poor visibility conditions (urban canyon/tall buildings, bridges/underpasses, etc.).

z Home Lock and Point of Interest performance upgraded.

Assistant Software 

z “Cruise Control” function added to the IOC page.

z “Home Fence (H-Fence)” page and “Airport Limit” page in “Limits” tag added.

z “Parachute” tag added.

Notes: 

z Ensure controller unit firmware matches IMU firmware. Otherwise there is a potential aircraft damage risk.

z Upgrade GPS module to the latest version to enhance the GPS performance in harsh conditions.

z Upgrade gimbal firmware to the latest version (v2.0) to use with the latest A2 firmware (v2.4).

z Use with the latest version of the DJI A2 Assistant Software, Ground Station and gimbal firmware.

z Mac users should use the latest A2 Assistant software on Mac OS X 10.9 or above.

z When upgrade is complete, check the configuration of A2 controller unit then unlock the controller unit in A2 Assistant.

z Once upgraded, calibration parameters saved in the A2 controller unit will be cleared. Recalibrating the IMU and the compass is 

required.
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 6

Date : May 30th, 2014 

A2 Controller Unit Firmware Version : 2.4 

A2 IMU Firmware Version : 2.2 

A2 GPS PRO Firmware Version 

A2 GPS Module Firmware Version 

: 2.2 

: 2.2 

A2 Receiver Firmware Version : 1.1 

A2 LED Firmware Version : 2.0 

A2 Assistant Software Version for PC : 1.3 

DJI Assistant App Version for iOS Device : 1.1.16 

 

 

What is new? 

 

Firmware 

z Removed airport flight restrictions. 

 
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 7

Date : May 8th, 2014 

A2 Controller Unit Firmware Version : 2.2 

A2 IMU Firmware Version : 2.2 

A2 GPS PRO Firmware Version 

A2 GPS Module Firmware Version 

: 2.2 

: 2.2 

A2 Receiver Firmware Version : 1.1 

A2 LED Firmware Version : 2.0 

A2 Assistant Software Version for PC : 1.3 

DJI Assistant App Version for iOS Device : 1.1.15 

A2 Flight Control System User Manual : 1.16 

 

What is new? 

Firmware 

z Propulsion allocation optimization and flight stability enhancements. 

z New compass algorithm further reduces the impact of strong magnetic interference.

z Fixed gimbal servo travel limit. 

Assistant Software 

z New IMU calibration function.

z “Upgrade All” button added.

 

User Manual 

z Instruction for IMU calibration.

Important: Upgrade GPS module firmware to the latest version for better GPS performance in harsh environment. Previous versions of DJI

Assistant App were not compatible with the current A2 firmware. Upgrade to the latest version to ensure compatibility.

 
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 8

Date : December 27, 2013 

A2 Controller Unit Firmware Version : 2.1 

A2 IMU Firmware Version : 2.1 

A2 GPS PRO Firmware Version 

A2 GPS Module Firmware Version 

: 2.1 

: 20.1 

A2 Receiver Firmware Version : 1.1 

A2 LED Firmware Version : 2.0 

A2 Assistant Software Version for PC : 1.2 

DJI Assistant App Version for iOS Device : 1.1.14 

A2 Flight Control System User Manual : 1.12 

 

What is new? 

 

Firmware 

1. Enhanced performance of A2 flight control system in data loss situations that are caused by abnormal communications.

2. Optimized e control performance, if the command of Yaw control stick is zero, the command variation of Elevator, Roll and Throttle will 

not change the aircraft attitude around Yaw. 

3. Optimized IOC function and POI algorithm to improve user experience.

4. Optimized communication protocol.

5. Support to upgrade A2 GPS Module.

6. Fixed the attitude jitters during Failsafe and Go Home.

 

Assistant Software 

1. Added RC status display. 

2. Assistant Software released with support for Mac OS X 10.6(Lion) or above. Assistant software usages on Mac and Windows are exactly 

the same.

 

User Manual 

1. Added installation and usage instructions for A2 Assistant Software on Mac OS X.

2. Added Failsafe settings for traditional receiver users. 

3. Added RC status description.

4. Revised the control mode introduction.

5. Added trouble shooting list of motors start failures.

6. Added a note that if the second level low voltage alerts occur when the aircraft is during Failsafe and Go Home process or the aircraft 

is controlled by Ground Station, the aircraft will descend automatically.

7. Revised the recording conditions in IOC function.

8. Added a system error LED indicator shown in continuous 4 red blinks.

9. Revised the attitude status LED indicator, there is no blinks if the attitude status is good and continuous 3 white blinks if bad.

10. Added the note that when using with A2, the firmware of iOSD Mark II should be V3.0 or above and OSD Viewer should be V4.0 or

above.

Notes for Upgrade 

1. For safety reasons, do not use the power battery for power supply during firmware upgrade. Reconfigure all parameters in the Assistant 

Software after firmware upgrade.

2. When using the A2 flight control system firmware version V2.1, the firmware of other DJI products used in conjunction must be matched 

with the requirements in the table below. 

Other DJI Products Firmware/Software Version (or above) Assistant Software( use to upgrade) 

iOSD Mark II V3.0 iOSD V4.0 & OSD Viewer V4.0

iOSD mini V1.04 iOSD V4.0
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 9

Zenmuse H3-2D GCU V1.6 & IMU V1.6 & CMU1.0 H3-2D V1.02

Z15-GH3 GCU V0.12 & IMU V1.4 Z15-GH3 V1.00

Z15-5D GCU V0.12 & IMU V1.4 Z15-5D V1.00

Z15-5N/7N/GH2/5R GCU V0.0.12 & IMU V1.0.18_beta Z15 V1.4

2.4G Bluetooth Datalink The Ground end V1.0.1.5 & The Air End V1.0.1.1 & BTU V1.0.1.2 2.4G Bluetooth Datalink V1.0.0.6

iPAD Ground Station V1.3.56

3. When launching for the first time on Mac OS X, please open the Assistant Software in the Finder. After the first successful launch, the 

application can be launched by double-clicking the A2 icon in the Finder or using Launchpad.

4. Please download the application installer in DMG format from the download page of A2 on the DJI website.

5. The Assistant Software for Windows and Mac OS X will updated simultaneously in the future.
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 10

Date : 2013.10.25 

A2 Controller Unit Firmware Version : 2.0 Beta 

A2 IMU Firmware Version : 2.0 

A2 GPS PRO Firmware Version : 2.0 

A2 Receiver Firmware Version : 1.1 

A2 LED Firmware Version : 2.0 

A2 Assistant Software Version for PC : 1.1 

DJI Assistant App Version for iOS Device : 1.1.13 

A2 Flight Control System User Manual : 1.10 

 

What is new? 

 

Firmware 

1. Support of Ground Stations, providing 50 waypoints for use. To utilize the Ground Station function, please connect the Air end of the 

Datalink module either directly to the port labeled CAN2, located on the A2 Controller unit or the CAN port, located on any modules 

which are already connected to the CAN2 port using a CAN-Bus cable. 

2. Support of a remote configuration feature by using the DJI Assistant App on iOS through Bluetooth, which requires the A2 LED 

firmware version 1.1 or above.

3. Support of the DJI Zenmuse H3-2D gimbal. (The firmware of the H3-2D should be upgraded, which is coming soon.)

4. Option to dedicate nose or tail direction to point towards Home Point while performing the Go-Home procedure.

5. A control mode indicator added to the system, the LED will blink blue when the aircraft is utilizing the Ground Station function. 

Assistant Software 

1. Option to dedicate nose or tail direction to point towards Home Point while performing the Go-Home procedure on the Failsafe page. 

The tail of the aircraft points towards Home Point when performing Go-Home by default.

2. H3-2D channel added to the Channel Mapping page, specialized for the H3-2D gimbal pitch control.

3. Channel Mapping button added to every page for convenience.

4. Display RC STATUS in the bottom of the A2 Assistant Software page.

 

User Manual 

1. Add the connection of H3-2D and A2 Flight control system. To utilize the H3-2D gimbal, please connect the GCU module either directly 

to the port labeled CAN2, located on the A2 Controller unit or the CAN port, located on any modules which are already connected to 

the CAN2 port using a CAN-Bus cable. 

2. Add the usage description of the H3-2D channels.

3. Add the description of DJI Assistant App on iOS device, including introduction, download, installation, and usage.

4. Revise the LED Indicator description; the control mode indicator will blink blue when the aircraft is utilizing the Ground Station 

function. 

5. Add the descriptions of RC STATUS displayed on the bottom of the A2 Assistant Software page.

Important: 

z Must upgrade the iPad Ground Station to the version 1.3.56 when using with the A2 Flight control system and the firmware of A2 

Flight control system and 2.4G Bluetooth Datalink should be upgraded to the latest version.

z Please upgrade the firmware of A2 Flight control system to the latest version before using the DJI Assistant App on iOS device to 

configure. 

z For safety reasons, do not use the power battery for power supply during firmware upgrade.

z Reconfigure all parameters in the Assistant Software after firmware upgrade.
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 11

Date : 2013.09.26 

A2 Controller Unit Firmware Version : 1.0 

A2 IMU Firmware Version : 1.0 

A2 GPS PRO Firmware Version : 1.0 

A2 Receiver Firmware Version : 1.1 

A2 LED Firmware Version : 1.0 

A2 Assistant Software Version : 1.0 

A2 Assistant App Version for iOS : 1.0(Coming soon) 

A2 Flight Control System User Manual : 1.08 

 

What is new? 

 

Receiver Firmware 

z Support DSM2 satellite Receivers used with all SPEKTRUM Transmitters, e.g. DX6I DX7S DX8 DX18 etc., as well as JR Transmitters, 

e.g. DXS9II DXS11

User Manual 

z Add the supported DSM2 Receivers and linking procedures

z Add the descriptions of the control mode configuration in the Assistant software

Cautions: 

z When using the DSM2 satellite Receivers, it is no need to enable the Failsafe function in the Transmitter. Once the Receiver loses the 

signals from the Transmitter, the controller unit will enter into Failsafe automatically, and the aircraft will hover or Go-home as 

configurations of the Failsafe in the Assistant software.

z For safety reasons, do not use the power battery for power supply during firmware upgrade.

z Re-configure all parameters in the assistant software after firmware upgrade.
A2 Product Release Notes 

©2014 DJI. All Rights Reserved. 12

Date : 2013.09.04 

A2 Controller Unit Firmware Version : 1.0 

A2 IMU Firmware Version : 1.0 

A2 GPS PRO Firmware Version : 1.0 

A2 Receiver Firmware Version : 1.0 

A2 LED Firmware Version : 1.0 

A2 Assistant Software Version : 1.0 

A2 Assistant App Version for iOS : 1.0(Coming soon) 

A2 Flight Control System User Manual : 1.00 

 

Functions 

z Various configurations of multi-rotors supported

 Quad-rotor(I4,X4),Hexa-rotor(I6,V6,Y6,IY6),Octo-rotor(X8,I8,V8)

 Customized mixer

z Remote gain adjustment

 From transmitter

 From a mobile device via Bluetooth link

z One-key Go home

z “Height Limit" and "Distance Limit" function

z Voltage monitoring

 2 levels low-voltage protection

 Automatic go home

 Landing protection

z Fail-Safe protection

 Hover

 Auto Go home and landing

z Motor failure tolerance for Hexa-rotor

 For Hexa-rotor IY6 or Y6 : Keep balance of attitude (roll, pitch and yaw)

 For Hexa-rotor I6 or V6 : Keep roll and pitch attitude, possible with spinning

z Intelligent Orientation Control(IOC)

 Course lock(CL)

 Home point lock(HL)

 Point of interest(POI)

z S800 EVO Intelligent landing gear supported

z 2-axis gimbals supported

z iOSDMark II, and all series Z15 gimbals products Supported

z Receiver

 Built-in Receiver DR16: Futaba FASST series Transmitter supported

 External Receivers

 S-bus Receiver

 PPM Receiver

 SPEKTRUM Satellite DX6I DX8 Receiver(more DSM2 series receivers will be supported)

Cautions: 

z For safety reasons, disconnect the power battery during firmware upgrade.

z Re-configure all parameters in the assistant software after firmware upgrade.

z Power cycle procedures

 Power off: Disconnect the USB cable first, and then disconnect the external power battery.