Content
Product Model ……………………………………………………………………………………………………….. 1
Specifications ………………………………………………………………………………………………………… 1
Appearance and Size …………………………………………………………………………………………….. 1
Function Summary ………………………………………………………………………………………………… 2
General Operation …………………………………………………………………………………………………. 2
◆Definition of Button …………………………………………………………………………………………… 2
◆Power on/off ……………………………………………………………………………………………………… 2
◆Display Interface ……………………………………………………………………………………………….. 2
◆6km/h Push-assistance …………………………………………………………………………………….. 3
◆Headlight ………………………………………………………………………………………………………….. 3
◆PAS level ………………………………………………………………………………………………………….. 4
◆Motor Power ……………………………………………………………………………………………………… 4
◆USB connection ………………………………………………………………………………………………… 5
◆Error code…………………………………………………………………………………………………………. 5
Parameter setting ………………………………………………………………………………………………….. 6
Display settings …………………………………………………………………………………………………….. 6
◆Trip Reset…………………………………………………………………………………………………………. 6
◆Toggle Unit ……………………………………………………………………………………………………….. 7
◆Wheel Diameter Settings ………………………………………………………………………………….. 7
◆Speed Limited Settings …………………………………………………………………………………….. 8
◆Voltage Value Setting ……………………………………………………………………………………….. 8
◆LCD luminance settings ……………………………………………………………………………………. 9
◆SOC settings …………………………………………………………………………………………………… 10
◆AL Sensitivity Settings ……………………………………………………………………………………. 10
◆Auto Power-off Time ……………………………………………………………………………………….. 11
Advanced settings ………………………………………………………………………………………………. 11
◆Assist Levels Setting ………………………………………………………………………………………. 11
◆Current limit setting …………………………………………………………………………………………. 12
◆PAS Sensor Magnetic Steel Number Settings ………………………………………………… 12
◆Speed Sensor Settings …………………………………………………………………………………… 13◆Start Strength Setting ……………………………………………………………………………………… 13
◆Assist Sensitivity Setting …………………………………………………………………………………. 14
◆Reset To Defaults Setting……………………………………………………………………………….. 14
◆Password Setting ……………………………………………………………………………………………. 15
Power-on Password Enable ……………………………………………………………………………. 15
Reset Power-on Password ……………………………………………………………………………… 16
◆Zero Start Setting ……………………………………………………………………………………………. 16
◆Drive Mode Setting …………………………………………………………………………………………. 17
Information（hardware version） ………………………………………………………………………. 17
Bluetooth Function ……………………………………………………………………………………………… 18
◆Add Bluetooth Device ……………………………………………………………………………………… 18
◆Adjust the PAS Level ……………………………………………………………………………………… 19
◆Turn on the Headlight ……………………………………………………………………………………… 19
◆Multi-system switching ……………………………………………………………………………………. 20
Find MY …………………………………………………………………………………………………………………. 21
◆Search for FIND MY ……………………………………………………………………………………….. 21
◆Find MY Unbinding method： …………………………………………………………………………… 22
Quality Assurance and Warranty Scope ……………………………………………………………. 22
Connection Layout ………………………………………………………………………………………………. 22
Operation Cautions ……………………………………………………………………………………………… 23
Attached list 1：Error code definition ……………………………………………………………….. 23
1
Product Model
Intelligent TFT display for E-bike; model: KD986
Specifications
●36V/48V 电源供电 36V/48V Power Supply
●Rated working current: 50mA
●The maximum working current： 200mA
●Off leakage current： <1μA
●Operating temperature：-20～60℃
●Storage temperature：-30～70℃
Appearance and Size
Display appearance and dimension drawing (unit: mm) 2
Function Summary
KD986 can provide a lot of functions to fit your needs. The indicating contents are as
follows:
●Battery indicator
●Motor power indicator
●PAS level adjustment and indicator
●Speed function (incl. real speed, Max. speed and Avg. speed)
●Distance（Trip and ODO）
●6km/h push assistance
●Riding time
●Backlight
●Error code
●USB connection
●Various Parameters Settings (e.g., wheel size, speed-limited, battery capacity
setting, assistance level etc.)
General Operation
◆Definition of Button
The KD986 display matches the K43 remote, and there are 4 buttons: including on/off,
i key, plus key/headlight key, minus key/boost key; in the subsequent instructions, the word
“ON/OFF” is used for the on/off key Replacement; the i button is replaced by the word “i”;
the plus/headlight button is replaced by the word “UP”; the minus/boost button is replaced
by the word “DOWN”.
◆Power on/off
After long pressing the “ON/OFF” button for 2 seconds, the display will turn on and the
whole system will work normally. In the power-on state, long press the “ON/OFF” button to
turn off the power of the e-bike.
■When parking the E-bike for more than 5 minutes, the E-bike system switches off
automatically.
◆Display Interface
After switching on the E-bike system, the display will show Real Speed and Trip
Distance(KM) as default. Pressing the “i” button to switch between following items:
Trip (Km) →ODO (Km)→Max. Speed (Km/h)→ Avg. Speed (Km/h) →Riding Time
(Min.) Display Interface
◆6km/h Push-assistance
Hold the “DOWN” button will activate the push-assistance function, after 2s, the E
bike will travel at a uniform speed of 6 Km/h while the screen displays “ ”. The push
assistance function is switched off as soon as you release the “DOWN” button. The E-bike
system stops the power output immediately, and back to the status before push-assistance
mode.
Push-assistance Mode
◆Headlight
Press and hold the “UP” button for more than 2 seconds to turn on the headlights.
3 After turning on the headlights, the brightness of the backlight will decrease. Press and
hold the “UP” button for more than 2 seconds to turn off the headlights and restore the
brightness of the backlight.
Headlight Interface
◆PAS level
Short press the “UP” or “DOWN” button to switch the power assist gear of the electric
vehicle and change the output power of the motor. The default output power range of the
display is PAS level 0-5. PAS level 0 stop power output, PAS level1 is the minimum power,
PAS level 5 is the maximum power. As shown in the figure, it is PAS level 1.
Assist Level Interface
◆Motor Power
The power of the motor can be read via the interface, like the following picture.
4 5
Motor Power Display Interface
◆USB connection
When the display is plugged into a USB external device, the meter will display the
interface as shown in the figure below.
USB Connection Interface
◆ Error code
When the electronic control system fails, it will automatically display the error code.
Here is the detailed message of the error code in Attached list 1.
Error Code Interface
■When an error code is displayed, please remove the fault in time, the e-bike will
not be able to run normally after a fault occurs Parameter setting
Long press the “ON/OFF” button to power on. In the power-on state, when the e-bike
is stationary, press and hold the “i” button for more than 2 seconds, and the display enters
the setting state. Including Display setting (display settings), Advanced settings (advanced
settings) and Information (software information)
Setting Interface
▉All the settings are operated on a parked e-bike.
Display settings
◆Trip Reset
Short press “i” to confirm, short press “UP” or “DOWN” to switch between “NO (not
clear)” and “YES (clear)”; (clear data includes maximum speed (MAXS), average speed
(AVG), Trip (TRIP), riding time (Time)), short press “i” again after confirmation, save and
exit to “TRIP Reset”.
Press and hold the “i” key to exit to the main interface or press “BACK” to exit to the
main interface. The above data will not be automatically cleared when the display is turned
off or the e-bike is powered off.
Trip Reset Interface
6 7
◆Toggle Unit
Press the “UP” button or the “DOWN” button to choose the “Toggle Unit”, and then
press the “i” button to enter unit settings, press the “UP” button or the “DOWN” button to
switch between “Metric” and “Imperial”, press the “i” button to save and exit “Toggle Unit”.
The default value is “Metric”.
Toggle Unit Interface
◆Wheel Diameter Settings
“Wheel” represents wheel diameter settings. Press the “i” button to enter wheel
diameter settings. To change basic settings, press the “UP” or the “DOWN” button to select
the desired value. The values can be selected are “16” / ”18” / ”20” / ”22” / ”24” / ”26” / ”700c”
/ ”28”, press the “i” button to save and exit “Wheel”.
Wheel Diameter Settings Interface ◆ Speed Limited Settings
“Speed Limit” represents speed limit settings. Press the “i” button to enter speed limit
settings. To change basic settings, press the “UP” or the “DOWN” button to select the
desired value. The range is “12-39(km/h)/off”, the default value is no speed limited, press
the “i” button to save and exit “Speed Limit”.
Speed Limit Setting Interface
◆Voltage Value Setting
“Set Voltage” represents the battery power setting, short press the “i” key to enter the
battery power setting interface. Short press “UP” or “DOWN” to switch the voltage value to
support 36V 48V, and then short press “i” to enter the voltage node switch, “31.5” is the
first power value, by short pressing “UP” or “DOWN” button to increase /minus to change
the value, short press the “i” button to confirm and enter the next power setting interface;
after the 5 power values are set, short press “i” to save the settings and return to “Set
Voltage”.
8 9
Voltage Setting Interface
Voltage interface
◆LCD luminance settings
“LCD Luminance”, indicates the backlight brightness setting. Short press “i” to enter
the setting, by short pressing “UP” or “DOWN”, the backlight brightness range is “100%-
75%-50%-30%-10%” 5 levels of brightness, 100% corresponds to the highest brightness,
10 % corresponds to the lowest brightness; short press “i” to save and exit to “LCD
Luminance”. 10
LCD Luminance Settings Interface
◆SOC settings
“SOC View” represents two display methods of remaining battery capacity. One is a
percentage and the other is a voltage value. Short press the “UP” or “DOWN” button to
select the desired display mode. Short press “UP” or “DOWN” to select voltage, percentage
“Voltage”/”Percent” two modes, short press “i” to save and exit to “SOC View”.
Voltage Display Setting Interface
◆AL Sensitivity Settings
“AL Sensitivity” represents the sensitivity of light perception. To change the value,
short press the “UP” or “DOWN” button to select the sensitivity value. The light sensitivity
value range is “5-4-3-3-2-1-OFF”, short press “i” to save and exit to “AL Sensitivity”.
AL Sensitivity Setting Interface
◆Auto Power-off Time
“Dormancy” represents the automatic shutdown time of the meter. Short press “UP”
or “DOWN” to select “Dormancy”, short press “i” to enter the setting, short press “UP” or
“DOWN” to select the automatic shutdown time range, the automatic shutdown time range
is “9-8-7- 6-5-4-3-3-2-1-OFF” (Min), short press “i” to save and exit to “Dormancy”.
Auto Power-off Time Setting Interface
Advanced settings
◆Assist Levels Setting
“Power Set” stands for power boost gear mode. There are 6 modes available: 0-3, 1-
3, 0-5, 1-5, 0-9, 1-9. Change the assist gear range by short pressing “UP” or “DOWN”,
11 12
short press “i” to save and exit to “Assist levels”.
Assist Levels Setting
◆Current limit setting
“Current Limit” indicates the current limit value setting. The adjustable range is “6A-
20A”. Change the maximum current value of the controller by short pressing the “UP” or
“DOWN” key. Short press “i” to save and exit to “Current Limit”.
Current Limit Settings Interface
◆PAS Sensor Magnetic Steel Number Settings
“Assistant Num” represents the number of sensor magnets. Short press the “UP” or
“DOWN” key to modify the setting, the range of the magnetic steel number of the assist
sensor is “05, 08, 12”, short press “i” to save and exit to “Assistant Num”. 13
PAS sensor number settings
◆Speed Sensor Settings
“Speed Sensor” represents the speed sensor setting. Short press the “UP” or “DOWN”
key to select the number of magnetic heads, and the setting range is “01-99”. Short press
“i” to save and exit to “Speed Sensor”
Speed Sensor Setting Interface
◆Start Strength Setting
“Start Strength” indicates the start strength setting. Select the desired value by short
pressing the “UP” or “DOWN” key. The range is “5-4-3-2-1-0”, short press “i” to save and
exit to “Start Strength” 14
Start Strength Setting Interface
◆Assist Sensitivity Setting
“Sensitivity” stands for assist sensitivity. Select the assist sensitivity value by short
pressing the “UP” or “DOWN” button. The power assist sensitivity range is “3-24”, short
press “i” to save and exit to “Sensitivity”.
Assist Sensitivity Setting Interface
◆Reset To Defaults Setting
Short press “UP” or “DOWN” to select “Reset to defaults”, short press “i” to enter the
setting, short press “UP” or “DOWN” to switch between “YES” (restore factory settings) /
“NO” (do not restore factory settings), short press “i” to save and exit to “Reset to defaults”. 15
Reset To Defaults Setting Interface
◆Password Setting
Short press “UP” or “DOWN” to select “Password”, short press “i” to enter the setting,
then short press “i” to select Start PassWord; short press “UP” or “DOWN” to switch ” OFF
(closed)”/”ON (open)”, the following is the specific switching method.
Password Setting Interface
Power-on Password Enable
After selecting “ON” in the “Start PassWord” interface, short press “i” to confirm, the
interface prompts to enter the password, short press “UP” or “DOWN” key to enter the
value, short press “i” key to shift, 4 digits After the password is entered, short press the “i”
key to confirm; the interface prompts to enter the password again. After the two inputs are
consistent, the system prompts that the password is set successfully. If the two inputs are
inconsistent, you need to repeat the first step to enter a new password and confirm. After
the 2S interface automatically jumps to the original setting interface 16
Password Enable Setting Interface
Reset Power-on Password
After the password is enabled, the “Pass word” interface will add a “Reset Password”
option, press “UP” or “DOWN” to select “Reset Password”, press “i” again to confirm, and
the interface reminds to enter the current password. After the input is correct, the interface
reminds to enter a new password, and the subsequent operations are consistent with the
new password settings. After the password is successfully modified, then 2S the interface
automatically jumps to the original setting interface.
Power-on Password Resetting Interface
◆Zero Start Setting
Short press “UP” or “DOWN” to select “Zreo Start”, short press “i” to enter the 17
settings, short press “UP” or “DOWN” to switch between “YES” (zero start) / “NO” (non
zero start), short press “i” to save and exit to “Zreo Start”.
Zero Start Setting Interface
◆Drive Mode Setting
Short press “UP” or “DOWN” to select “Drive Mode”, short press “i” to enter the setting,
short press “UP” or “DOWN” to switch between “P/T Override” (coexistence) / “PAS Only”
(assist Drive) / “Throttle only” (electric drive), short press “i” to save and exit to “Drive
Mode”.
Drive Mode Setting Interface
Information（hardware version）
Short press the “i” key to enter “Information”, you can view the software information.
Press and hold the “i” key to exit to the setting interface or press “BACK” to exit to the setting interface.
Hardware Version Interface
Remarks: The software version number is only used for internal retrospective use
of Key-Disp
Bluetooth Function
◆Add Bluetooth Device
Open the Key-Disp APP and enter the APP homepage, click “My-More Devices-Add
Device” to search for Bluetooth to add the display, click “Searched Bluetooth Devices
Finish”, the display will show the symbol, which means the connection is successful.
The Bluetooth device is added successfully Interface
18 Bluetooth Connection Success Interface
◆Adjust the PAS Level
After the Bluetooth connection is successful, you can use the “+” and “-” functions in
the Key-Disp APP to increase or decrease the PAS level of the e-bike to change the output
power of the motor. PAS level 0 means no power assist output.
Adjust the PAS Level by APP
◆Turn on the Headlight
After the Bluetooth connection is successful, you can turn on the headlights through
the “Headlights” function of the Key-Disp APP. After turning on the headlights, the
brightness of the backlight will decrease. Click “Headlights” again to turn off the headlights,
19 and the brightness of the backlight will return to the original brightness.
Turn on the headlight by APP
◆Multi-system switching
After the Bluetooth connection is successful, multiple Bluetooth systems can be
switched through the Key-Disp APP.
Multi-system switching Interface
◆ Navigation interface
20 After the Bluetooth connection is successful, you can open the navigation interface
through the “map navigation” function of the Key-Disp APP, enter the destination, and the
display will synchronize the mobile phone navigation interface.
Connect display navigation interface by APP
Find MY
◆Search for FIND MY
1) Press and hold the “+” button for more than 3s, release it, and trigger network
distribution;
2) Use the Find APP of the Apple mobile phone to search for FIND MY.
21 ◆Find MY Unbinding method：
1. First, remove the item on the iPhone-Find APP.
2. Power on the meter again. After power-on > 40s, press and hold “+” for 15s and
release it, and the unbinding is complete. Then use the search app to search again to verify
whether the unbinding is successful.
Quality Assurance and Warranty Scope
Ⅰ Warranty
（1）The warranty will be valid only for products used in normal usage and conditions.
（2）The warranty is valid for 24 months after the shipment or delivery to the customer.
Ⅱ Others
The following items do not belong to our warranty scope.
（1）The display is demolished.
（2）The damage of the display is caused by wrong installation or operation.
（3）Shell of the display is broken when the display is out of the factory.
（4）Wire of the display is broken.
（5）The fault or damage of the display is caused by the force majeure (e.g., Fire,
Earthquake, etc.).
（6）Beyond Warranty period.
Connection Layout
Connector line sequence
22 23
Line sequence table
Line
Color Function
1
Red（VCC）
+
2
Blue（K）
Lock
3
Black（GND）
–
4
Green（RX）
RX
5
Yellow（TX）
TX
■Some wire use the water-proof connector, users can not see the inside color.
Operation Cautions
Be careful of safe use. Don’t attempt to release the connector when battery is on power.
●Try to avoid hitting.
●Do not modify system parameters to avoid parameters disorder.
●Make the display repaired when error code appears.
This operating instruction is a general-purpose version. Some of the version for the
display software will be different from the specification, which should depend on the actual
use version.
■If no operation is performed within one minute, the display will automatically
exit the setting state.
Attached list 1：Error code definition
Error
Definition
21
Current Abnormality
22
Throttle Abnormality
23
Motor phase Abnormality
24
Motor Hall Signal Abnormality
25
Brake Abnormality
30
Communication Abnormality
