Fly Sky FS-ST8 User manual

FS-ST8
Copyright ©2022 Flysky Technology co., ltd
USER MANUALUSER MANUAL
Digital Proportional Radio
Control System
.

Thank you for purchasing our products. Read the manual carefully to ensure your
personal safety as well as the safety of your equipment.
If you encounter any problems during using, please refer to this manual 󽗉rst. If the
problem is still not resolved, please contact the local dealer directly or contact the
customer service sta󽗈 via the website below:
http://www.󽗊ysky-cn.com

1.Safety ..................................................................... 1
1.1 Safety Symbols .....................................................................1
1.2 Safety Guide .........................................................................1
2.Introduction ............................................................. 2
2.1 Transmitter overview .............................................................2
2.1.1 Button/Scroll Wheel ...................................................................................................... 3
2.1.2 USB Simulatior Function ................................................................................................ 3
2.1.3 Number of Channels ...................................................................................................... 3
2.1.4 Instruction About the Newly Controls for Upgraded version ............................................ 3
2.2 Receiver overview (FS-SR8) .....................................................4
2.2.1 LED Status .................................................................................................................... 4
2.2.2 Interface ....................................................................................................................... 4
2.3 Antenna ...............................................................................4
3. Getting Started ......................................................... 5
3.1 Installing Transmitter Battery .................................................5
3.2 Installing Receiver and Servo ..................................................5
4. Operation guide ........................................................ 6
4.1 Power On .............................................................................6
4.2 LED .....................................................................................6
4.3 Binding ................................................................................ 6
4.4 Stick Calibration ...................................................................7
4.5 Power Off ............................................................................7
5. Main menu ............................................................... 8
6. Function menu .......................................................... 9
6.1 Transmitter settings ............................................................ 10
6.1.1 TX SET - MODEL ........................................................................................................... 10
6.1.2 TX SET - TRAINER ......................................................................................................... 11
6.1.3 TX SET - STICK MODE ................................................................................................... 11
6.1.4 TX SET - SYSTEM SETTING ............................................................................................ 12
6.1.5 TX SET - TIMERS ........................................................................................................... 13
6.1.6 TX SET - SWITCHES SETTINGS ...................................................................................... 13
6.1.7 TX SET - FIRMWARE UPDATE ......................................................................................... 13
6.1.8 TX SET - ABOUT ........................................................................................................... 14
6.1.9 TX SET - HELP CENTER ................................................................................................. 14
6.1.10 TX SET - MORE ........................................................................................................... 14
6.1.10 TX SET - FACTORY RESET ............................................................................................ 14
6.2 Receiver settings ................................................................. 14
6.2.1 RX SET - BIND SETTINGS .............................................................................................. 14
6.2.2 RX SET - FAILSAFE ........................................................................................................ 15
6.2.3 RX SET - SENSOR ......................................................................................................... 15
6.2.4 RX SET - RF SETTINGS .................................................................................................. 16
6.2.5 RX SET - i-BUS SETTINGS .............................................................................................. 16
6.2.6 RX SET - SENSOR CALIBRATION .................................................................................... 16
6.2.7 RX SET - GPS SETTING .................................................................................................. 16
6.3 Model settings .................................................................... 17
6.3.1 MDL SET - CONDITIONS ................................................................................................ 17
Contents

6.3.2 MDL SET - RATE/CURVE ................................................................................................ 17
6.3.3 MDL SET - THROTTLE CURVE ........................................................................................ 18
6.3.4 MDL SET - THROTTLE HOLD .......................................................................................... 18
6.3.5 MDL SET - V-TAIL .......................................................................................................... 18
6.3.6 MDL SET - DELTA-WING MIX .......................................................................................... 18
6.3.7 MDL SET - TRACK MIX ................................................................................................... 19
6.3.8 MDL SET - PITCH CURVE ............................................................................................... 19
6.3.9 MDL SET - HELI PITCH SETUP ....................................................................................... 19
6.3.10 MDL SET - GYROSCROPE ............................................................................................. 19
6.4 General settings .................................................................. 20
6.4.1 GENER MENU - MONITOR ............................................................................................. 20
6.4.2 GENER MENU - REVERSE .............................................................................................. 20
6.4.3 GENER MENU - END POINTS ......................................................................................... 20
6.4.4 GENER MENU - CH SPEED ............................................................................................. 21
6.4.5 GENER MENU - AUX CH ................................................................................................. 21
6.4.6 GENER MENU - TRIMS .................................................................................................. 21
6.4.7 GENER MENU - MIXES ................................................................................................... 21
7. FS-SR8 Function instructions .................................... 23
7.1 Attentions .......................................................................... 23
7.2 Binding .............................................................................. 23
7.3 RSSI .................................................................................. 23
7.4 Updating the Firmware of the Receiver ................................... 23
7.5 Failsafe of the Receiver ........................................................ 23
8. DIY Customization ................................................... 24
8.1 Throttle Bracket Installation ................................................. 24
8.2 Throttle Spring Installation ................................................... 26
8.3 Swapping Gimbals ............................................................... 27
8.4 Device Holder Installation ..................................................... 28
8.5 Stealth I/O RF Module Adapter Installation .............................. 29
8.6 Antenna Assembly Installation ............................................... 30
9. Product Specifications ............................................. 31
9.1 Transmitter specification（FS-ST8） ....................................... 31
9.2 Receiver specification（FS-SR8） ........................................... 32
10. Package Contents .................................................. 33
11. Certifications ....................................................... 34
11.1 DoC Declaration ................................................................. 34
11.2 CE Warning ....................................................................... 34
11.3 Appendix 1 FCC Statement .................................................. 34
12. Environmentally friendly disposal ............................ 35

1
• Misuse of this product may lead to serious injury or death. To ensure the safety of you
and your equipment, read this manual and follow the instructions.
• Make sure the product is properly installed in your model. Failure to do so may result in
serious injury.
• Make sure to disconnect the receiver battery before turning o󽗈 the transmitter. Failure
to do so may lead to unintended operation and cause an accident.
• Ensure that all motors operate in the correct direction. If not, adjust the direction 󽗉rst.
• Make sure the model stays within the systems maximum range to prevent loss of
control.
• Do not use the product at night or in bad weather like rain or thunderstorm. It can
cause erratic operation or loss of control.
• Do not use the product when visibility is limited.
• Do not use the product on rain or snow days. Any exposure to moisture (water or snow)
may cause erratic operation or loss of control.
• Interference may cause loss of control. To ensure the safety of you and others, do not
operate in the following places:
• Nearanysitewhereotherradiocontrolactivitymayoccur
• Nearpowerlinesorcommunicationbroadcastingantennas
• Nearpeopleorroads
• Onanybodyofwaterwhenpassengerboatsarepresent
• Do not use this product when you are tired, uncomfortable, or under the in󽗊uence of
alcohol or drugs. Doing so may cause serious injury to yourself or others.
• The 2.4GHz radio band is limited to line of sight. Always keep your model in sight as a
large object can block the RF signal and lead to loss of control.
• Do not touch any part of the model that may generate heat during operation, or
immediately after use. The engine, motor or speed control, may be very hot and can
cause serious burns.
Prohibited Mandatory
1.Safety
1.1 Safety Symbols
Pay close attention to the following symbols and their meanings. Failure to follow these warnings could cause
damage, injury or death.
1.2 Safety Guide
Warning • Not following these instructions may lead to major injuries.
Danger • Not following these instructions may lead to serious injuries or death.
Attention • Not following these instructions may lead to minor injuries.

FS-ST8
Digital Proportional Radio Control System
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[28]
[29]
[27]
[26]
[25]
2.Introduction
This product uses the 2.4 GHz ANT (Ant Protocol) automatic frequency hopping digital system, consisting of FS-
ST8 transmitter and FS-SR8 receiver. It has an output of 8-10channels, compatible with model 󽗉xed-wing aircraft,
delta-wing airplanes, helicopters, gliders, multicopters, engineering vehicles, robots, etc.
2.1 Transmitter overview
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[18]
[16]
[15]
[17]
[14]
[13]
[12]
[11]
[30]
[20]
[21]
[19]
[22] [23]
[24]
[1] Display [11] Carrying Handle [21] Trainer Jack（3.5mm audio head）
[2] EXIT Button [12] VRB Knob [22] A Reserved Hole for SMA Antenna
[3] MENU Button [13] SWC Three-position Switch [23] Type-C Port
[4] T1/T2 Trim Button [14] SWD Two-position Switch [24] VRD Knob(For upgraded version)
[5] Neck Strap Hook [15] LED Indicator [25] KEY1 Button(For upgraded version)
[6] Left Stick [16] Right Stick [26] KEY2 Button(For upgraded version)
[7] (Power Switch) [17] T3/T4 Trim Button [27] Stealth I/O RF module interface
[8] SWA Two-position Switch [18] Scroll Wheel [28] A Reserved Hole for XT30 Cable）
[9] SWB Two-position Switch [19] A Hole for Fixing the Cell Phone Holder [29] Battery Compartment
[10] VRA Knob [20] VRC Knob(For upgraded version) [30] JST Jack

3
2.1.1 Button/Scroll Wheel
2.1.2 USB Simulatior Function
2.1.3 Number of Channels
2.1.4 Instruction About the Newly Controls for Upgraded version
Operation Instructions for MENU, EXIT and Scroll Wheel.
MENU button
• Press MENU in the main page to enter the function menu.
• Press and hold MENU for seconds to enter MONITOR menu.
EXIT button
• Press EXIT to return to the previous menu. In the editing state, you can press EXIT to save and exit the editing
state.
• Except the transmitter is in 󽗉rmware updating process or in main menu state, press and hold EXIT for 2S to return
to the main menu.
• In main menu, press and hold EXIT for 3S to lock the screen. In the screen lock state, there will be no response if
you press any buttons. To unlock the screen, press and hold EXIT for 3S.
Scroll Wheel
• In the selected state, press Scroll wheel to enter the next level menu.
• To set turn on/o󽗈 a function, you select it by scrolling Scroll Wheel and press Scroll wheel for switching between
ON and OFF.
• In the function item editing status, press Scroll wheel to determine the editing result, and press EXIT to save and
exit the editing status.
• In the case of no next-level menu, press Scroll wheel after the selection by scrolling Scroll Wheel, to enter the
editing state. In this case, you can scroll the Scroll wheel left and right for editing.
• In the detail menu and if no item is in the editing state, you can press Scroll wheel for 2S to reset all data in the
current menu. All data will be reset to the default values. The system prompts a reminder to reset. To continue
the reset, select YES. To cancel, select NO.
• In the menu, scroll Scroll wheel to select a item. In the function item editing status, scroll Scroll wheel to select a
item/adjust a parameter.
The system can be connected via a Type-c USB cable to a computer for use as a HID device. This function is
automatically activated when connected to a computer and will be recognised as a standard HID controller.
The transmitter can output up to 10 channels, and the number of channels can be set according to the actual
application. For the setting steps, refer to 6.1.6 TX SET - SWITCHES SETTINGS.
The upgraded version has added 4 new switches: VRC, VRD, KEY1 and KEY2. The switches are o󽗈 in default. If
you want to use these switches, you need to set to ON via Main menu > Transmitter Settings> TX SET - SWITCHES
SETTINGS. For the setting steps, refer to 6.1.6 TX SET - SWITCHES SETTINGS.
Attention • If the computer does not recognise the transmitter unplug and reconnect the USB
cable.

FS-ST8
Digital Proportional Radio Control System
4
Light on in red: The receiver is connected to the power supply. It works normally.
Fast 󽗊ashing: The receiver is in the bind mode.
Slow 󽗊ashing: The LED 󽗊ashes slowly when the receiver is powered o󽗈, unbound, or no signal.
Three-󽗊ash-one-o󽗈: The 󽗉rmware of the receiver is upgrading.
2.2.2 Interface
All the interfaces are 2.54 mm standard pins for connecting the receiver to each terminal part of the model. Please
follow the direction according to the direction on the the receiver.
2.3 Antenna
Attention
• To ensure the signal quality, the transmitter and receiver antennas should be
kept vertical to the ground as much as possible. In operations, please adjust the
transmitter angle. Make the antenna towards the direction of the model receiver.
Keep the receiver antenna extending out of the model and perpendicular to the
ground.
Warning
• It is strictly prohibited to hold the antenna of the transmitter and the antenna of the
receiver in operations. Otherwise, the quality and strength of the radio transmission
signal will be greatly reduced, resulting in the failure and out of control of the model.
Attention
• Do not pull the antenna of the receiver. Do not tie the antenna and the servo cable
together. Do not put the antenna close to the metal materials, because this will a󽗈ect
the signal strength of the receiver.
It should be noted that this is a transmitter with two built-in antennas. Please use the transmitter correctly.
2.2 Receiver overview (FS-SR8)
The status LED indicates the power supply state of the receiver and its working state.
O󽗈: The receiver is not powered on.
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[16]
[18][17]
[8]
[9]
[10]
[11]
[12]
[15][14][13] [13][14][15]
[19] [20]
[21]
2.2.1 LED Status
[1] CH1/PPM [8] CH8 [15] Signal pin
[2] CH2 [9] BIND interface [16] LED
[3] CH3 [10] BVD/VCC(Battery voltage detection/
Power supply interface)
[17] Antennas
[4] CH4 [11] SENS interface [18] BIND button
[5] CH5 [12] SERVO/S.BUS interface [19] BVD harness
[6] CH6 [13] - (Power cathode) [20] Connect to battery positive pole
[7] CH7 [14] + (Power anode) [21] Connect to battery negative pole

5
3. Getting Started
Danger • Do not use the battery if damaged
Battery type: AA batteries or 2S lithium batteries JST interface inside the battery compartment.
Please follow the steps below to install the transmitter batteries：
1. Openthebatterycompartmentcover.
2. Put4AAbatterieswithsu󽗋cientelectricityintothebatterycompartment.Ensurethatthemetalterminalsonthe
batteriescontactthemetalterminalsinsidethebatterycompartment.
• Oryoushouldchoosethepropersizeof2S7.4VlithiumbatterytoaccesstheJSTinterface.Connectthem
correctly.
3. Coverthebatterycompartment.
3.2 Installing Receiver and Servo
Installthereceiverandservointhefollowingmethods:
Prior to operations, please install the battery and connect devices according to the sequence and guide as
described in this chapter.
3.1 Installing Transmitter Battery
Danger • Do not open, disassemble, or attempt to repair the battery.
Danger • Only use speci󽗉ed battery (X4 AA batteries).
Danger • Do not crush/puncture the battery, or short the external contacts.
Danger • Do not drop the battery or expose to strong shocks or vibrations.
Danger • Do not expose to excessive heat or liquids
Danger • Always store the battery in a cool, dry place.
CH1 Aileronservo
Elevatorservo
Throttleservo
Rudderservo
AUXservo
AUXservo
AUXservo
AUXservo
CH2
CH3
CH4
CH5
CH6
CH7
CH8

FS-ST8
Digital Proportional Radio Control System
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4. Operation guide
After setting up, follow the instructions below to operate the system.
This LED is a multi-color indicator. It displays in a variety of colors such as red, green, blue, yellow, cyan, purple,
white, and dazzling colors. You can set a color as required. You may set it to none.In addition, you may set it to
display the electricity level. The brightness of LED can also be adjusted via TX SET> SYSTEM SETTINGS >LED.
Follow the steps below to perform the settings:
1. Poweronthetransmitter.PressMENUtoenterthefunctionmenu.SelectTX SET(TransmitterSettings)andthen
pressScroll Wheeltoenter.
2. SelectSYSTEMSETTINGSandpressRollertoenterthesystemsettingsmenu.ScrolltheScroll Wheel toselectLED
COLOR andpressScroll Wheel,theselecteditemis󽗊ashingnow.
3. ScrolltheScroll WheeltoselecttheappropriateitemandpressScroll Wheel. Press EXIT to save and exit.
Follow the steps below to turn on the transmitter:
1. Checktomakesurethatthatbatteryisfullychargedandinstalledcorrectly.
2. Pressandhold untilthescreenlightsup.
3. Poweronthereceiver.
4.3 Binding
The transmitter and the receiver have been pre-bound before delivery. If you are using another receiver, follow
the steps below to bind the transmitter and the receiver. The transmitter supports two-way binding and one-way
binding, and two-way binding is the default setting. The transmitter will display the information returned from the
receiver after the two-way binding is completed.
4.1 Power On
Note • Operate with caution in order to avoid damage or injury.
Note • For your safety, please turn the transmitter switch and throttle to the safe position.
• Applicable to the FS-ST8 transmitter and the FR-SR8 receiver. Di󽗈erent receivers have di󽗈erent bind
procedures. For more information visit the FLYSKY website for manuals and other related information.
• Product information is updated regularly, please visit our website for more information.
4.2 LED
1. Turnonthetransmitter,thenpressMENUtoenterthemainmenu.ScrolltheScroll Wheel tonavigatetotheRX
SETandpresstheScrollWheeltoenterRX SETTINGSmenu.ThenscrolltheScroll WheeltonavigatetotheBIND
SETTINGSandpresstheScroll Wheel toenter.Scrollthe Scroll Wheel tonavigatetothe STARTandpresstheScroll
Wheel toputthetransmitterintobindmode.
2. PlugthepowercabletotheBVD/VCCinterfaceofthereceiver,theLEDofthereceiver󽗊ashesslowlythismoment.
PressandholdtheBINDbuttonofthereceiverover3S,ortaptheBINDbuttonandthenpoweronthereceiver.The
LEDofthereceiver󽗊ashesfast,thenreleasetheBINDbutton.
3. Afterthebindingprocessiscompleted,theLEDofthereceiverstops󽗊ashingandissolidon.
4. Checktomakesurethetransmitterandthethereceiverareworkingcorrectly,ifthereareanyissuesorunexpected
operationarise,followthestepsabovetobindagain.
Note: If the transmitter that has its radio frequency set to 1WAY enters bind mode, the LED of the receiver will be in slow 󽗊ashing state.
You need to put the transmitter to exit bind mode manually and if the LED of the receiver stops 󽗊ashing and is solid on, indicating that the
binding is completed.
This product system is compatible with most of our ANT Protocol receiver models. The details are as follows:
RFstandard:2.4GHzANT protocol

7
4.4 Stick Calibration
4.5 Power O󽗈
Danger • Make sure to disconnect the receiver power before turning o󽗈 the transmitter. Failure
to do so may lead to damage or serious injury.
Follow the steps below to turn o󽗈 the system:
1. Disconnect the receiver power.
2. Press and hold to turn o󽗈 the transmitter.
Note: If the pop-up window indicates that the calibration has failed, it means that the control
to be calibrated has not reached the maximum and minimum travel range, the recalibration
is required.
The calibration is required in case of data o󽗈set of the transmitter due to physical wear in long-term operations. At
this time, we need to calibrate the output data and neutral angle of the stick, throttle trigger, and potentiometers.
The transmitter has been calibrated at the factory. If you need to recalibrate it, please follow the steps below to
perform the settings:
1. Poweronthetransmitter,entertheTX SETmenu,andselectthe
CALIBRATIONfunction.FollowthepromptstopresstheSTART for
calibration.
2. Swingthestickstothemaximumandminimumtravelrangeineach
directionrespectivelyandthenreleasethem.
3. TapCALIBRATION toexitthecalibrationinterface.Thecalibrationis󽗉nished.

FS-ST8
Digital Proportional Radio Control System
8
5. Main menu
Instructions are about the main menu.
Theiconsshownhereindicatethatthefunctionis
enabled,Lockicon,Flightmodeicon,Throttlehold
iconandGPSicon.
T3/T4Trim
T1/T2Trim
SENSORS
Modelnameandthenumber
Statusbar:ToshowthesignalstrengthandTX
voltage.Whenthereceiverisbound,andthevoltage
ofthereceiveris6V,thenRX6.0Vwilldisplayedhere.
Timer
Quick access to the menu：
SelecttheareaandpressScrollWheel
toacessSENSOR menuquickly.
SelecttheareaandpressScrollWheel
toacessTIMERS menuquickly.
SelecttheareaandpressScroll
WheeltoacessSELECT TYPE menu
quickly.
SelecttheareaandpressScroll
Wheeltoacessmodel menuquickly.
Note: Up to three
sensors' information
can be displayed here.

9
6. Function menu
In this transmitter, we have classi󽗉ed the functions and made a new layout. There are 4 categories in icons in total.
That is: TX SET(Transmitter Settings), RX SET(Receiver Settings), MDL SET(Model menu), GENER MENU(General
menu). After the classi󽗉cation, it will become more convenient and easy to set up the model
The next-level menu may vary with di󽗈erent model type, and lists below:
For DELTA-WING: CONDITIONS, RATE/CURVE, THROTTLE CURVE, THROTTLE HOLD and DELTA-WING MIX;
For FIXED-WING: CONDITIONS, RATE/CURVE, THROTTLE CURVE, THROTTLE HOLD and V-TAIL;
For MULTICOPTER: CONDITIONS, RATE/CURVE, THROTTLE CURVE and THROTTLE HOLD;
For ENGINEERING VEHICLE: CONDITIONS, RATE/CURVE, THROTTLE CURVE, THROTTLE HOLD and TRACK MIX;
For ROBOT: CONDITIONS, RATE/CURVE, THROTTLE CURVE, THROTTLE HOLD and TRACK MIX;
For GLIDERS: CONDITIONS, RATE/CURVE, THROTTLE CURVE, THROTTLE HOLD and V-TAIL;
For HELICOPTERS: CONDITIONS, RATE/CURVE, THROTTLE CURVE, THROTTLE HOLD, PITCH CURVE, HELI PITCH
SETUP and GYROSCROPE;
For BOAT: CONDITIONS, RATE/CURVE, THROTTLE CURVE and THROTTLE HOLD;
For CAR: CONDITIONS, RATE/CURVE, THROTTLE CURVE and THROTTLE HOLD.
Function settings:
Inthemaininterface,pressMENUtoenterthefunctionmenu.SelectthefunctioncategorybyscrollingScroll Wheel.
PressScroll Wheel toenterthecorrespondingnext-levelmenu.

FS-ST8
Digital Proportional Radio Control System
10
6.1 Transmitter settings
There are 11 function menus in TX SET menu: MODEL, TRAINER, STICK MODE, CALIBRATION, SYSTEM SETTINGS,
TIMERS, SWITCH SETTINGS, FIRMWARE UPDATE, ABOUT, HELP CENTER, MORE and FACTORY RESET.
In the main menu, press MENU to enter the function menu. Selec TX SET by scrolling Scroll Wheel and press Scroll
Wheel to enter.
6.1.1 TX SET - MODEL
The MODEL menu is used for model management. It includes 󽗉ve options: MODEL SELECT, MODEL NAME, SELECT
TYPE, MODEL COPY and MODEL RESET.
SELECT MODELThetransmittercansaveupto20setsofmodeldata,andyoucancalloutonesetofmodeldataat
anytimeanduseitasneeded.
MODEL NAMEThenameofthemodelyouselectcanbeeditedandchanged.
SELECT TYPE Toprovideatotalof9di󽗈erenttypesofmodels,anditcoversmostofkindsofthemodels.
MODEL COPYIfyouhaveanewmodelthatisthesameorsimilartothemodelyouusedbefore,youcanusethis
functiontomakeacopyforquicksetting.
MODEL RESETItmeansthatthisfunctionwillresetallthesetvaluesofthemodelparametersandrestorethefactory
settings.
Function settings:
1. IntheMODELmenu,selectthefunctionbyscrollingScroll
WheelandpressScroll Wheeltoenterthecorresponding
next-levelmenu.
2. IntheMODEL SELECT menu,scrollScroll Wheeltoselect
anappropriatemodelandpressScroll Wheel tocon󽗉rm,
thenpressEXITtosave.
3. InMODEL NAMEmenu,scrollScroll Wheel toselectan
appropriatealphabetornumber.UseDELETEtodelete
therelatedcharacters.Tosavethesettingsbypressing
ScrollWheelwhileSAVEisinselectingstate.Itsupports
upto8characters
4. InSELECT TYPEmenu,scrollScroll Wheeltoselectan
appropriatetypeandpressScroll Wheelto󽗉nish.
• IftheHelicopterisselected,aswashsettingmenu
comesalongwithit,selectanappropriateswash,then
pressScroll Wheelto󽗉nish.
5. InMODEL COPYmenu,scrollScroll Wheeltoselectthe
modelforFROMandTOrespectively,thenselectCOPY
andpressScroll Wheel,apop-upmenucomealongwith
it.SelectOKandpressScrollWheeltocon󽗉rm.PressEXIT
tosaveandexit.
6. ForMODEL RESET,selectOKandpressScroll Wheelto
con󽗉rminthepop-upmenuappeared.

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This function is suitable for beginners. The trainer can make instruction and training for the students under
supervision, to avoid the risks caused by beginners in the learning process.The trainer function can be enabled by
selecting Status: ON. Then, users can set a switch to control the trainer function. When the switch is on, the trainer
controls the aircraft. When the switch is o󽗈, the student controls the aircraft. For example, if the trainer and the
student use two FS-ST8 transmitters for teaching and training. The trainer's FS-ST8 transmitter needs to be set to
ON for this function with a control switch, and the student's transmitter does not need to be set.
The transmitter provides four stick mode, you can set it according to your habit. CH1 represents Aileron, CH2
represents Elevator, CH3 represents Throttle, CH4 represents Rudder.
Mode2(M2) is the de fault mode. Changing between modes
2/4 (M2/M4)and modes 1/3 (M1/M3)will necessitate changing
the throttle gimbals position. You need have to open up the
product, see [8.3 Swapping Gimbals] for details.
6.1.2 TX SET - TRAINER
6.1.3 TX SET - STICK MODE
Function settings:
1. SelectSTICK MODE andpressScroll Wheel toenter.
2. Selectan appropriateitembyscrollingScroll Wheel
and pressScroll Wheel to󽗉nish.
3. Testthefunctiontocon󽗉rmallthechanneldirectionis
thesameastheactuallyexpecteddirection.
4. Themechanicalstructuremayadjustasneededafter
themodeisselected.Namelythethrottleneedstobe
adjustedfromself-returntonon-self-returnandvice
versa.Inaddition,inthemodeofthrottlenon-self-
return,thethrottlepositionshouldbeadjustedwhen
itisfromlefttorightandviceversa.Forotherchanges,
theadjustmentisnotrequired.
Function settings:
1. SelectTRAINER andpressScroll Wheel toenter.
2. SetON orOFFtoturnonorturno󽗈usingScroll Wheel.
3. Setaswitch.Inthemenu,selectaswitchandits
correspondingpositionto󽗉nish,oryoucantogglethe
correspondingphysicalswitchonthetransmitterto
󽗉nish.
Notes:
1. Use a trainer cable to connect the two transmitters which are
for the trainer and the student. Make sure the trainer cable
connected well before using this function.
2. VALID will be displayed on the top of this menu, when trainer
transmitter and student transmitter are connected successful.
Elevator
Mode
Throttle
Rudder Aileron
Mode
Elevator Throttle
Rudder
Aileron
Mode
Mode
Throttle Elevator
Rudder Aileron
Throttle Elevator
Rudder
Aileron

FS-ST8
Digital Proportional Radio Control System
12
The system setting function is used to set the transmitter system, including setting the language, sound, volume,
alarm time, vibration, vibration grade, battery type, LED color, LED, brightness, time of backlight and autoshutdown.
6.1.4 TX SET - SYSTEM SETTING
Function settings:
1. SelectSYSTEM SETTING andpressScroll Wheel toenter.
2. Selecta function you want to setandpressScroll Wheel,theselected
boxis󽗊ashingnow.
3. Selectan appropriateitemand pressScroll Wheel to󽗉nish.PressEXIT
tosaveandexit.
LANGUAGETosetthesystemlanguage,includingChineseandEnglish.
SOUNDTosetthesoundforsystemandalarm.SYS+ALAmeansthesame
soundforsystemandalarm.
VOLUME Tosetthevolumeofthesound.
ALARM TIME Tosetthetimeoftheidlealarmorwhethertoenablethe
idlealarmfunction.
VIBRATION Tosetthevibrationofthesystemandalarm.SYS+ALAmeans
thesamevibrationforsystemandalarm.
VIBRATION GRADE Tosetthevibrationgradeofthesystemandalarm.
BATTERY TYPETosetthebatterytype.
BAT ALARMTosetthevoltageaccordingtothebatterytype.
LED COLORTosetthecoloroftheLED.
LEDTosetthebrightnessoftheLED.
BRIGHTNESSTosetthebrightnessoftheLCD.
CONTRASTTosetthecontrastoftheLCD.
TIMETosetthetimeofthebacklight,namelyhowlongthescreentakes
toturno󽗈whennotinuse.
Note: Leaving the screen on for longer will use more power and as such may lead to
reduced battery time.
AUTO SHUTDOWNTosetthetimeofautoshutdownorturno󽗈it.

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The Timer function is used for timing in races, including count up and countdown. You can also use it to test a
tank of fuel or a full battery and con󽗉rm the usage time. The transmitter provides two timers, which can be set
independently to achieve di󽗈erent timing functions. Start, stop and reset switches can be set to enable, disable or
reset the timer by the switch. The timer alarm time can also be set. After setting the time, the system will send an
alarm for reminder 10 seconds prior to the expiration. The main interface will display it after the timer is set.
Used to set which controls can be assigned iincluding Trim, Knob and Switch, then the controls can be assigned to
some functions in controlling the output. The channel numbers can be set via CH NUM.
Used to update the 󽗉rmware of the transmitter. When the 󽗉rmware needs to be upgraded, it is need to put the
transmitter into upgraded mode using this function 󽗉rst.
6.1.5 TX SET - TIMERS
6.1.6 TX SET - SWITCHES SETTINGS
6.1.7 TX SET - FIRMWARE UPDATE
Function settings:
1. SelectTIMERS andpressScroll Wheel toenter.
2. ForTYPE, the selected box is 󽗊ashing now whenselectit.SelectUP or
DOWN.IfDOWNisselected,youneedtosetthetimeusingScroll Wheel,
then pressEXITtosaveit.
3. Set switches to START, STOP and RESET using Scroll Wheel. You can also
set a throttle trigger value to start the timer to calculate the working time
of the throttle after the timer is on.
4. For ALARM, set ON or OFF using Scroll Wheel. If a alarm is set, you need to
set the alarm time using Scroll Wheel. PressEXITtosaveit.
Function settings:
1. SelectSWITCHES SETTINGS andpressScroll Wheel toenter.
2. Selecta control you want to set usingScroll Wheel.
3. SelectanappropriateitemandpressScroll Wheel to con󽗉rm. PressEXITto
saveandexit.
Function settings:
1. Downloadthelatest󽗉rmware.
2. ConnectthetransmitterandthePCviaaType-CUSBcable.Openthe
󽗉rmwareonacomputer.
3. Atthetransmitterside,selectFIRMWARE UPDATE.Thesystemwillshowa
promptmenu,selectOKandpressScroll Wheel toputthetransmitterinto
updatingmode. Click Update onthe󽗉rmwarescreenonthecomputer.
Notes:
1. You can set three-position switch to two-position switch via this function.
2. In addtion, you can set the position-level when the physical switch needs to be changed
here.
Notes:
1. Always ensure su󽗋cient power supply for the transmitter when using this function. To
avoid the receiver losing control, make sure to power o󽗈 the receiver before starting
this function.
2. Don't disconnect the Type-C USB cable during the 󽗉rmware updating, otherwise the
transmitter may occur a fault.
3. You can also upgrade the 󽗉rmware through FLYSKYAssistant.

FS-ST8
Digital Proportional Radio Control System
14
Used to display the system information, such as hardware version, etc.
To obtain the user manual via this function.
To obtain the website and FaceBook via this function.
Used to restore the entire transmitter system to the factory settings in case a number of parameters are adjusted
incorrectly during operation.
The ex-factory bind settings of the transmitter and receiver are completed successfully. If you want to use a new
receiver, please bind the transmitter and the receiver before use.
6.1.8 TX SET - ABOUT
6.1.9 TX SET - HELP CENTER
6.1.10 TX SET - MORE
6.1.10 TX SET - FACTORY RESET
6.2.1 RX SET - BIND SETTINGS
Function settings:
SelectABOUT andpressScroll Wheel toenter,thenyoucanviewtherelated
information.
Function settings:
SelectHELP CENTER andpressScroll Wheel toenter,thenyoucanviewthe
relatedinformation.
Function settings:
SelectMORE andpressScroll Wheel toenter,thenyoucanviewtherelated
information.
Function settings:
1. SelectFACTORY RESET andpressScroll Wheel toenter,thenapop-upmenu
appears.
2. SelectOKandpressScroll Wheel to󽗉nish.
6.2 Receiver settings
The RX SET(receiver setting) menu provides a number of function setting menus to allow you to set up the
receiver system in all aspects. That is, BIND SETTINGS, FAILSAFE, SENSOR, RF SETTING, i-BUS SETTINGS, SENSOR
CALIBRATION.
In the main menu, press MENU to enter the function menu. Select RX SET by scrolling Scroll Wheel and press Scroll
Wheel to enter.
BINDToputthetransmitterintobindmode.
OUTPUTItprovidestwocombinedoutputmodes,youcanchoseoneofthePWM/S.BUS，PPM/i-BUS，PWM/i-BUS
andPPM/S.BUS.
Note:The receiver can output PPM signal via CH1 and i-BUS signal via SERVO/S.BUS interface. It also can input i-BUS signal via SENS
interface.

15
FREQUENCYTosetanapppropriatefrequencyaccordingtoyourservos.
Note: Note: When the frequency value is set to 50HZ, it presents the analog servo, and set to 333HZ, it is for digital servo. For other servo,
set the value in the range between 50 and 400HZ.
RFSTANDARDTherearetwooptionsavailable,ANT1WAYone-wayandANT2WAYtwo-way.Ifyouareusingatwo-
wayreceiver,itisrecommendedtoselectANT2WAYtwo-way,whichmaybringyouabetterexperiencewithmore
informationfeedback.
Refer to 4.3 Bind setting for function settings.
Failsafe is an important safety setting. It can be used to protect the model from loss or reduce the degree of loss
when the receiver loses signal without control. In addition, it plays a role in protecting personnel safety.
You can set the data in case of loss of control for all output channels.
As an interesting feature for two-way communication systems, sensors can be used to send back some information
you need through the receiver.
The transmitter can support up to 15 di󽗈erent types of returned data to provide you with the feedback of seven
basic parameters, i.e., TX VOL(TX voltage), RX VOL(RX voltage), BVD VOL(BVD voltage), SIGNAL(signal intensity),
NOISE, SNR(noise rate) and RSSI.
For BVD function, it is used to detect an external power supply. It is recommended to use this function to monitor
the battery voltage and give an alarm in case of a failure. To perform an alarm by setting alarm values for LOW and
HIGH.
6.2.2 RX SET - FAILSAFE
6.2.3 RX SET - SENSOR
Function settings:
1. SelectFAIL SAFE andpressScroll Wheel toenter.
2. Selecta item you want to set usingScroll Wheel.
3. SelectanappropriateitemandpressScroll Wheel to con󽗉rm. PressEXITto
saveandexit.
IfitissettoON,thesystemwillshowapromptmenu,selectOKandpress
Scroll Wheel tocon󽗉rm.Thenyoucansetafailsafeforeachchannel.
Notes:
1. For bus signal types such as PPM/i-BUS/S.BUS, a single or several of these channels are
not allowed to be in OFF mode. The actual signal is held at the last output value when
the channel is set to OFF
2. Because the S.BUS signal information contains failsafe 󽗊ag bits, the failsafe settings of
each channel are communicated to subsequent devices by the failsafe 󽗊ag bits. If the
connected devices support the failsafe 󽗊ag bit analysis, the failsafe values set for each
channel are output after out of control.
3. For the signal PPM/i-BUS without failsafe 󽗊ag bits, it supports the setting of the signal
to OFF mode in case of out of control. After setting to OFF mode, regardless of the
setting of the failsafe of each channel, each channel will be in OFF mode after out of
control. The failsafe function has no default set at the factory and as such must be set
manually.
4. If no failsafe setting has been set, then the receiver will not output anything when signal
is lost.
Function settings:
1. ConnectasensortothereceiverviatheSENSinterface. At the transmitter
side, selectSENSOR andpressScroll Wheel toenter.
2. Selecta item you want to set usingScroll Wheel, such as TX VOL, using
Scroll Wheel, you can set it to dispaly on the main menu,aswellasset
aalarmfunctionanditsalarmvaluecorrespondingtoLOWandHIGH
voltage.
3. PressEXITtosaveandexit.
Displaysthesensornumber,type,
thedatareturnedbythissensor.
Thesolidiconindicatesthatthecorresponding
sensorhasbeensetonthemainmenu,andthe
hollowiconindicatesthatthecorresponding
sensorisnotset.

FS-ST8
Digital Proportional Radio Control System
16
This is an extended function option. The setting is used when the external RF module is needed.
This function is a unique and powerful serial communication protocol system provided by FLYSKY. It can be output
to any channel by setting. For receivers with i-BUS interface and corresponding accessories, such as Serial Bus
Receiver FS-CEV04. This function will be displayed when you set the OUTPUT to i-BUS mode via BIND SETTINGS
function.
6.2.4 RX SET - RF SETTINGS
6.2.5 RX SET - i-BUS SETTINGS
Function settings:
1. SelectRF SETTINGS andpressScroll Wheel toenter.
2. Selecta item you want to set usingScroll Wheel.
3. SelectanappropriateitemandpressScroll Wheel to con󽗉rm. PressEXITto
saveandexit.
Function settings:
1. The transmitter FS-ST8 and the receiver FS-SR8 are bound successfully.
Connect the input cable of the Serial Bus Receiver FS-CEV04 to the SERVO
interface of the receiver.
2. At the transmitter side, select i-BUS SETTINGS andpressScroll Wheel to
enter.
3. Select a channel to be assigned,thesystemwillshowapromptmenu,if the
channel is incorrect, select CANCEL to cancel.
4. If the selected channel is about to assign to C1 channel of the Serial Bus
Receiver FS-CEV04, then press the button K1 corresponding to C1 channel
of FS-CEV04 receiver by a long thin tool. After the setting is successful, the
system will pop up a menu showing successful.
Note: If the receiver is overloaded, please supply power separately to prevent the wire from
being burnt out due to excessive current.
This function is a special feature provided by FLYSKY. The setting allows you to make corrections to the parameters
of some external sensors that need to be calibrated, so as to display the sensing data accurately. For example, for
the external voltage sensor (BVD), after calibration, the displayed data will be closer to the real value.
This function needs to be used with the GPS sensor of FLYSKY. You can view the information returned by GPS sensor
after calibrating the GPS and setting an appropriate time. You can reset the start point when the displayed distance
is inaccurate.
6.2.6 RX SET - SENSOR CALIBRATION
6.2.7 RX SET - GPS SETTING
Function settings:
1. SelectSENSOR CALIBRATION andpressScroll Wheel toenter.
2. Selecta item you want to set usingScroll Wheel.
3. SelectanappropriatevalueandpressScroll Wheel to con󽗉rm. PressEXITto
saveandexit.
GPS DISPLAYTodisplaytheinformationreturnedbyGPSsensor.
GPS CALIBRATIONTocalibratetheheightvalue.
TIME ZONETosetanapproriatetimezone.Aftersetting,youcanviewthedate
andtimeviaGPSDISPLAY.