SIYI AK28 User manual

AK28 User Manual V1.3
1
2022 SIYI Technology Copyright
AK28
AGRICULTURE
SMART CONTROLLER
USER MANUAL
V1.3
Mar 2022

AK28 User Manual V1.3
2
2022 SIYI Technology Copyright
Thank you for purchasing SIYI Technology’s product.
With iUAV OS, a customized drone operating system powered by Android, AK28 is
born to promote UAV application to an easier, more efficient, and more stable level.
The new controller comes with an HD FPV camera and is integrated with long range
datalink and image transmission. It is designed and manufactured with waterproof
and dustproof ability of industrial level for drone operations in most circumstances.
Through digital image transmission, AK28 receives real-time FPV and has the
capability to process and display the information using its powerful operating system,
which finally helps pilot control and master their drones in a good way. AK28 makes
itself a perfect combination of UAV remote control and communication technology
in hardware and in software. Moreover, by providing an opening SDK to global users,
we believe that AK28's potential can be infinite as their ideas are accomplished on
the exciting platform!
To maintain a safe and orderly public space and to ensure you a good using
experience of AK28 transmitter, please read this manual carefully. If you have any
issue using the product, please consult the manual or check online pages of AK28
on SIYI official website (http://www.siyi.biz/). You can also send an email to SIYI
official A/S center ([e-mail]).

AK28 User Manual V1.3
3
2022 SIYI Technology Copyright
SIYI User Group - Facebook
SIYI YouTube Channel (https://www.youtube.com/c/SIYITech)
SIYI Official Aliexpress Store (https://siyi.aliexpress.com)

AK28 User Manual V1.3
4
2022 SIYI Technology Copyright
CONTENT
READ TIPS.................................................................................................................................................................1
Icons.........................................................................................................................................................................1
Safety.......................................................................................................................................................................1
Battery .....................................................................................................................................................................3
Memory Card (SD/TF)...........................................................................................................................................4
How to Use SIM Card on AK28...........................................................................................................................4
Storage/Carrying/Recycling..................................................................................................................................5
1 INTRODUCTION....................................................................................................................................................6
1.1 Product Features.............................................................................................................................................6
1.2 Parts..................................................................................................................................................................8
1.2.1 At a Glance...............................................................................................................................................8
1.2.2 Button/Switch Types and Default Channel Definitions.......................................................................9
1.2.3 Ports on AK28 Ground Unit..................................................................................................................10
1.2.4 Ports on VD32 Air Unit..........................................................................................................................11
1.3 Technical Specification.................................................................................................................................12
1.4 Packing List....................................................................................................................................................14
1.5 AK28 Common Diagram..............................................................................................................................15
1.6 Indicator Definition ........................................................................................................................................16
1.6.1 Ground Unit Indicator............................................................................................................................16
1.6.2 Air Unit Indicator.....................................................................................................................................17
2 GET READY TO USE AK28...............................................................................................................................18
2.1 Ground Unit....................................................................................................................................................18
2.1.1 Power On/Off..........................................................................................................................................18
2.1.2 Charging..................................................................................................................................................18
2.1.3 Charging Indicator..................................................................................................................................19
2.2 How to Place AK28 Antennas.....................................................................................................................21
2.2.1 How to Place Ground Unit Antenna....................................................................................................21
2.2.2 How to Place Air Unit Antenna.............................................................................................................25
3 SIYI TX APP..........................................................................................................................................................27
3.1 Channels.........................................................................................................................................................27
3.1.1 End Point.................................................................................................................................................27

AK28 User Manual V1.3
5
2022 SIYI Technology Copyright
3.1.2 Middle Point............................................................................................................................................28
3.1.3 Channel Reverse...................................................................................................................................29
3.1.4 Channel Mapping...................................................................................................................................29
3.2 Datalink...........................................................................................................................................................30
3.2.1 Connection..............................................................................................................................................31
3.2.2 Flight Controller......................................................................................................................................32
3.2.3 Baud Rate...............................................................................................................................................32
3.3 System............................................................................................................................................................33
3.3.1 Bind..........................................................................................................................................................34
3.3.2 Throttle Type...........................................................................................................................................35
3.3.3 Joystick Deadzone.................................................................................................................................35
3.4 Status..............................................................................................................................................................36
3.5 Failsafe ...........................................................................................................................................................37
4 DATALINKS...........................................................................................................................................................40
4.1 Communication with GCS through USB COM (Serial)............................................................................40
4.2 Communication with GCS via Bluetooth....................................................................................................42
4.3 Solutions to Disconnection ..........................................................................................................................44
5 SIYI FPV APP.......................................................................................................................................................45
6 IMAGE TRANSMISSION ....................................................................................................................................46
6.1 Using SIYI FPV Camera ..............................................................................................................................46
6.2 Solutions to No Image..................................................................................................................................46
7 ANDROID OS........................................................................................................................................................48
7.1 Download App................................................................................................................................................48
7.2 Import and Install App...................................................................................................................................48
7.2.1 Through SD Card...................................................................................................................................48
7.2.2 Through Micro-USB File Transfer .......................................................................................................48
8 Firmware Upgrade................................................................................................................................................50
9 After-sale Service.................................................................................................................................................54
9.1 Repair Service...............................................................................................................................................54
9.2 Warranty.........................................................................................................................................................55
9.2.1 7-Day Return & Refund.........................................................................................................................55
9.2.2 15-Day Replacement.............................................................................................................................56

AK28 User Manual V1.3
6
2022 SIYI Technology Copyright
9.2.3 1-Year Warranty Repair........................................................................................................................58
10 FCC STATEMENT.............................................................................................................................................60

AK28 User Manual V1.3
1
2020 SIYI Tech All Rights Reserved
READ TIPS
Icons
Please pay more attention to content indicated with the following marks:
DANGER Dangerous manipulation that probably leads to human injuries.
WARNING Warnings on manipulation that possibly leads to human injuries.
CAUTION Cautions on what manipulation may lead to property loss.
Prohibited Mandatory Mark
Safety
AK28 Agriculture Smart Controller is designed for professional application in
specific industries, users who approach to the equipment should have at least the
basic knowledge to operate it. Irregular or irresponsible manipulations to the device
may cause damage, property loss, or human injuries. Users under 14 years’ old
should follow an experienced trainer’s guide. Disassembling or modification to the
system is prohibited without permission from its manufacturer, SIYI Technology.
To maintain a safe and orderly public space and to ensure you a good using
experience of SIYI’s products, please read the prohibited and mandatory terms
carefully.

AK28 User Manual V1.3
2
2020 SIYI Tech All Rights Reserved
Do not use any SIYI system to operate your aircraft/vehicle/model at places with
intensive crowd (a square, a park), or at places with many obstructions (a street, a parking
lot), or in fields with strong magnetic or interference (an electricity plant, a radar station,
railways), or in any other fields where an irregular flight/operation may cause property loss
or human injuries.
Do not hold or cover the ground unit antenna or obstruct its transmission by any means
in a flight or in an operation.
Never point the ground unit antenna’s top ends straightly to your aircraft/vehicle while
it is working, they are the weakest parts for transmission.
Do not start your aircraft/vehicle/model when you are tired, drunk, in sickness or in
any circumstances you are not feeling good.
Do not fly an aircraft/model when it is rainy, windy or at night.
Do not power off the ground unit while your aircraft’s/vehicle’s/model’s engines and
motors are still working.
Please always try to operate your aircraft/vehicle/model within sight range.
Before a flight, please return to the starting menu on the ground unit.
Do not forget to check battery level of the ground unit and the air unit before starting
your aircraft/vehicle/model.
Always power off your aircraft/vehicle/model first, AK28 ground unit the second.

AK28 User Manual V1.3
3
2020 SIYI Tech All Rights Reserved
Before configuring any settings on the ground unit, make sure your
aircraft’s/vehicle’s/model’s engines are powered off and their motor wires are disconnected,
in case of a sudden switch-on.
When you start your aircraft/vehicle for the first time, make sure that the fail-safe
settings on your ground unit is activated.
Always switch on the ground unit first and hold the throttle joystick at zero output
position, then power on your aircraft/vehicle/model.
Battery
AK28 ground unit is equipped with a fast release chargeable 9600 mAh li-ion
battery. The ground unit can be charged with an 5V/2A Micro-USB charger
adapter. Please do read the precautions before using AK28 ground unit and
charging its battery.
Do not use any USB chargers over 5V/2A output to charge the ground unit.
Please power off AK28 ground unit before charging. The ground unit does not allow
charging while it is working.
Stop charging immediately if you found the charger damaged, broken or overheat.
Stop charging immediately if there was a peculiar smell, smokes or leaks from the
battery. In such cases you shall sent the product back to your dealer for after-sales service.
Do not charge the ground unit when its temperature is over 60℃.

AK28 User Manual V1.3
4
2020 SIYI Tech All Rights Reserved
Memory Card (SD/TF)
The memory card slot at bottom MK15 transmitter supports reading from and writing
into high-speed SD/TF card. Please mind the precautions below.
Do not disassemble, bend, press, abandon or damage memory card by any means.
Stop using the memory card if you find it soaked by water, oil or any other chemical
liquid.
CAUTION
A memory card is also an electronic product, keep it away from static electricity.
Keep the memory card slot clean in case of blocking by sand or dirt.
Keep the memory card in slot while you are downloading or uploading data; taking out it
mistakenly, hitting it or shattering it may cause damage or data loss.
Keep the memory card away from places that a baby or a kid may reach in case that it was
swallowed mistakenly by the baby/kid.
How to Use SIM Card on AK28
AK28 supports 4G network, like a smartphone. You can put in an SIM card into the
ground unit to activate the function.
Before putting in an SIM card into AK28 ground unit, please check if is compatible
with your local cellular network.

AK28 User Manual V1.3
5
2020 SIYI Tech All Rights Reserved
Supported Format and Frequency Bands
GSM/EGRPS 4 Frequency: GSM850/EGSM900/DCS1800/PCS1900
WCDMA: B1/B5/B8
TD-SCDMA: B34/B39
LTE: B1/B3/B8/B38/B39/B40/B41
Mark: AK28 ground unit has a dual-SIM-card slot.
Storage/Carrying/Recycling
When your SIYI system is standby, or you are bringing it outdoors, or the system
has expired of its service life, please do read the precautions below.
CAUTION
Always place your AK28 ground unit at places where babies or kids do not reach.
DANGER
AK28 ground unit should be placed as below:
Not too hot (above 60℃) or too cold (under -20℃).
Not under direct sunshine or too dusty or too wet.
Not on an unstable holder which lacks solid supports or may cause vibration.
Not nearby steam or other heat sources.

AK28 User Manual V1.3
6
2020 SIYI Tech All Rights Reserved
1 INTRODUCTION
1.1 Product Features
iUAV OS Customized Operating System
Powered by Android, iUAV OS is an improved operating system with deep learning
to drone users' requirement and habits, which provides a stable, convenient, and
efficient user experience. AK28 will share its SDK secondary development, and it
has many hardware extending ports for infinite possibilities to explore more features
in new application scenes
Digital Image Transmission
Integrated with digital image transmission system, AK28 can display real-time FPV
from the drone and ensure efficient and safe flight
*Compatible with all flight controllers on market.
*The FPV display floating window can be zoomed in or out.
*Effective image transmission range for agricultural drones can reach up to 2 km
(at 3 meters’ altitude).
Industry-level Protection
Considering the complicated working conditions of agricultural drones outdoors, the
completely waterproof and dustproof process has been done to key connectors on
AK28 operating panel, such as the shell, the switches, external ports, etc. With this

AK28 User Manual V1.3
7
2020 SIYI Tech All Rights Reserved
process, the controller and its system can still work in smooth and stable
performance despite how bad the environment could be.
Dual Navigation LED
Drone operations at night are safer than ever with VD32’s navigation LED of 8W
consumption and 120-degree searching angle.
High Brightness LCD Screen
Under direct sunlight, you can still have a clear view of real-time information display
due to AK28's 7" high brightness and high-definition LCD screen.
Replaceable High Capacity LiPo Battery
AK28 uses the same high-capacity Li-Po battery for top-class smartphone brands.
The battery features low internal resistance, long working time for 10 hours, and an
excellent power curve for the operating system. These are the exactly cool features
which most drone flight requires, especially the long flights.

AK28 User Manual V1.3
8
2020 SIYI Tech All Rights Reserved
1.2 Parts
1.2.1 At a Glance
Mark: Press and hold the power button three seconds to power on AK28 ground unit.

AK28 User Manual V1.3
9
2020 SIYI Tech All Rights Reserved
1.2.2 Button/Switch Types and Default Channel Definitions
AK28 ground unit is designed with 14 physical channels and 16 communication
channels in total. Communication channel 10 to 14 are mapped with PWM
channel 1 to 5 in default.
Channel
No.
Physical Channel Type
Default Mapping
Remark
1
Aileron
Joystick J1
2
Elevator (Mode 2)
Joystick J2
3
Throttle (Mode 2)
Joystick J3
4
Rudder
Joystick J4
5
3-Stage Switch SA
6
3-Stage Switch SB
7
3-Stage Switch SC
8
Camera LED
3-Stage Switch SD
9
3-Stage Switch SE
10
3-Stage Switch SF
PWM 1
11
Left Dial LD1
PWM 2
12
Right Dial RD1
PWM 3
13
Self-Reset Button S1
PWM 4
14
Self-Reset Button S2
PWM 4
15
Searchlight A
16
Searchlight B

AK28 User Manual V1.3
10
2020 SIYI Tech All Rights Reserved
1.2.3 Ports on AK28 Ground Unit

AK28 User Manual V1.3
11
2020 SIYI Tech All Rights Reserved
1.2.4 Ports on VD32 Air Unit
Video: Signal and power output for FPV camera.
UART: Telemetry output/input.
S.Bus: S.Bus signal output.
PWM1-5: PWM Signal output from PWM channel 1 to 5.

AK28 User Manual V1.3
12
2020 SIYI Tech All Rights Reserved
1.3 Technical Specification
Overall
AG Control Range
2 km
(Flying at 3-meter altitude)
Channels
14 physical, 16 communication
Datalink Supported FC
Open-Source Flight Controllers: Pixhawk, Holybro, CUAV
BOYING Paladin V2
JIYI K3A Pro / K++ V2
VK-FLY V7AG
Transmitter (Ground Unit)
Monitor
7-inch High Definition and High Brightness LCD
Touchscreen
Operating System
Android 7.0
2G RAM, 16G ROM
Dimension
(Antenna Folded)
308 x 148 x 72 mm
Weight
1100 g
Battery Capacity & Type
Fast Release Chargeable 3.7V 12000 mAh 1S Li-Po 1S
44.4 Wh
Battery Life
10 hours
Charging Time
About 9 hours (through Micro-USB)
5 hours (3 batteries through charging hub)
Interface & Ports
Charging: Micro-USB
Data Transfer: Micro-USB
Firmware Upgrade: DATA (4-Pin)
Mobile Network: SIM Card Slot
External Storage: SD Card Slot
Waterproof Level
IP53
Battery Working
Temperature
0 ~ 55 (℃)

AK28 User Manual V1.3
13
2020 SIYI Tech All Rights Reserved
Receiver (Air Unit)
Signal Output
14 channels of SBUS
5 channels of PWM
Interface & Ports
S.BUS & PWM: Pins
Datalink (to FC): UART 4-Pin
Video Input: 8-Pin Ethernet
Firmware Upgrade: Micro-USB
Dimension
(Antenna Excluded)
59 x 59 x 16 mm
Weight
(Antenna Excluded)
50 g
Antenna Gain
5 dBi
Power Input
14.8 ~ 58.8 V
(4S ~ 14S)
Operating Temperature
-10℃ ~ 55℃
Camera & Searchlight
Camera Angle
FOV 120°
Dimension
106 x 25 x 41 mm
Weight
108 g
Searchlight Power
Consumption
8 W
Luminous Flux
1 W / 120 ~ 140 lm
LED Type
Transparent
LED Angle
120°
Waterproof Level
IP67
Working Temperature
-10℃ ~ 55℃

AK28 User Manual V1.3
14
2020 SIYI Tech All Rights Reserved
1.4 Packing List
1 x AK28 Ground Unit
1 x VD32 Air Unit
1 x IP67 FPV Camera (with searchlights)
1 x Telemetry Cable
1 x Micro-USB to USB-A OTG Cable
1 x Type-C to USB-A OTG Cable
1 x USB Charger (5V/2A)
1 x Upgrading Tool
1 x Neck Strap
1 x Carrying Case