King-Meter J-LCD User manual

KING-METER TECHNOLOGY CO., LTD
No.15, Chenchang Road, Beichen Dist.Tianjin,300134,CN
Fax：[phone] Tel: [phone]
USERS GUIDE
J-LCD

KING-METER TECHNOLOGY CO., LTD
No.15, Chenchang Road, Beichen Dist.Tianjin,300134,CN
Fax：[phone] Tel: [phone]
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Content
User specification....................................................................................................................................... 1
1. Appearance and Size............................................................................................................................ 2
1.1 Material and Color ....................................................................................................................... 2
2. Function Summary and Button Definition..........................................................................................3
2.1 Function Summary...................................................................................................................... 3
2.2 Monitor Area .................................................................................................................................4
2.3 Button Definition........................................................................................................................... 4
3. Operation Cautions................................................................................................................................ 5
4. Installation Instruction............................................................................................................................ 5
5. Normal Operation................................................................................................................................... 5
5.1 Power On/Off................................................................................................................................ 5
5.2 Display Interface.......................................................................................................................... 6
5.3 Speed/TRIP/ODO........................................................................................................................ 6
5.4 Push Cruise Control.................................................................................................................... 6
5.5 Turn on/off Backlight.................................................................................................................... 7
5.6 PAS Level Selection.................................................................................................................... 7
5.7 Battery Indicator........................................................................................................................... 7
5.8 Time Indicator............................................................................................................................... 8
5.9 Error Code Information............................................................................................................... 8
5.10 General Setting.......................................................................................................................... 8
5.10.1 Clock Setting....................................................................................................................... 8
5.10.2 Backlight Contrast .............................................................................................................. 9
5.10.3 Show Units ......................................................................................................................... 9
5.10.4 Trip Distance Clearance
......................................................................................................9
5.10.5 Exit setting.......................................................................................................................... 9
5.11 Power-on Password Enable/Disable....................................................................................10
5.11.1 Power-on Password Enable..............................................................................................10
5.11.2 Power-on Password Modify............................................................................................. 10
5.12 Normal Parameter Setting.....................................................................................................10
5.12.1 Wheel Diameter Setting...................................................................................................11
5.12.2 Speed-limit Setting........................................................................................................... 11
5.13 Personalized Parameter Setting........................................................................................... 11
5.13.1 System Parameter Setting................................................................................................ 12
5.13.2 Battery Power Bar Setting................................................................................................ 12
5.13.3 Pedal Assistant Level Setting............................................................................................ 12
5.13.4 Controller Over-Current Cut Setting ................................................................................ 13
5.13.5 Pedal Assistant Sensor Setting.........................................................................................13

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5.13.6 Speed Sensor Selection.................................................................................................... 14
5.13.7 Throttle Definition............................................................................................................15
5.13.8 System Setting.................................................................................................................. 15
5.13.9 Exit setting........................................................................................................................ 16
5.14 Recover default setting...........................................................................................................17
6. Preparation before Starting ................................................................................................................ 17
7. FAQ......................................................................................................................................................... 18
8. Quality assurance and warranty scope............................................................................................18
Attached list 1：Error code definition........................................................................................................19
Attached list 2：Password table ................................................................................................................. 20
Attached list 3：Personality Parameter setting ......................................................................................... 21
Attached list 4：Power assist table ............................................................................................................23

KING-METER TECHNOLOGY CO., LTD
No.15, Chenchang Road, Beichen Dist.Tianjin,300134,CN
Fax：[phone] Tel: [phone]
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User specification
Dear users,
To ensure better performance of your e-bike, please read through the J-LCD product
introduction carefully before using. We will use the most concise words to inform you of all the
details（including the hardware installation, setting and normal operation use of the display）
when using our display. Meanwhile, the introduction will also help you to solve the possible
confusion and malfunctions.

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1. Appearance and Size
1.1 Material and Color
J-LCD products are made of white and black PC. Under the temperature of -20 to 60℃, the
shell material can ensure normal usage and good mechanical performance.
Real product and dimension figure (unit: mm)

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The J-LCD match has a dedicated 30 button, which can be mounted on the left or right side of
the handlebar.
Shape is as follows:
N3 buttons are wired to the bottom of the meter.
2. Function Summary and Button Definition
2.1 Function Summary
J-LCD provides a wide range of functions and indicators to fit the users’ needs. The indicated
contents are as following:
◆Battery Indicator
◆Real-time clock display
◆Speed Display (including running speed, max speed and average speed)
◆Trip distance and total distance
◆Cruise control
◆Headlight On/Off
◆Error Code Indicator
◆Various Parameters Setting
◆Recover Default Setting

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2.2 Monitor Area
Monitor Area
2.3 Button Definition
KM5S has three buttons. They are . In the following introduction,, they are
is named as “MODE”. is named as “UP” and is named as “DOWN”.

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3. Operation Cautions
Be care of the safety use. Don’t attempt to release the connector when battery is on power.
Try to avoid hitting.
Don’t split the waterproof sticker to avoid affecting the waterproof performance.
Don’t modify system parameters to avoid parameters disorder.
Make the display repaired when error code appears.
4. Installation Instruction
Fix the display onto the handlebar and adjust to an appropriate visual angle. Tighten all the
connectors.
5. Normal Operation
5.1 Power On/Off
Hold Mode button for 2 seconds then the display will power on, and the display will the power
on the controller. With display on, hold MODE to turn off power supply of the e-bike. With the
display off, the display and controller shut down. The leakage current is less than 1 uA.
When parking e-bike for more than 10 minutes, the display shut down automatically.

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5.2 Display Interface
After starting up the display, it will display the following interface:
After starting up the display interface
5.3 Speed/TRIP/ODO
Press [MODE] to switch the cycling mileage and cumulative total mileage. This feature makes
it easy for users to view TRIP and ODO.
TRIP interface ODOinterface
After the electric vehicle starts up, the display defaults to display the current speed.
Press [MODE] and [DOWN] button for 2 seconds to display the average speed of this ride
(AVG), press [MODE] and [DOWN] button for 2 seconds to display the maximum speed of
this ride (MAX), and press [MODE] and [DOWN] again for 2 seconds to return to the current
speed display, and so on.
Current speed average speed maximum speed switch to each other
5.4 Push Cruise Control
Hold [DOWN]for 2 seconds to enter the mode of power assistant walk. The e-bike will go on
at a uniform speed of 6 Km/h. shows on the screen flashing.

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Push Cruise Control
6Km/h “Push Cruise Control” function can only be used as pushing the e-bike
by hands. Please don’t use this function when riding.
5.5 Turn on/off Backlight
Hold [UP]2 seconds to turn on the backlight of the display, the headlight will be power on at
the same time. Hold [UP]for 2 seconds again, backlight turned off.
Turn On/Off Backlight
5.6 PAS Level Selection
Hold [UP]or [DOWN]to change the output power of the motor. The power ranges from level 1
to level 5. The default value is level 1.
PAS Level
5.7 Battery Indicator
The 5 battery bars represent the capacity of the battery. When the battery is in low voltage,
battery frame will flash to notice that the battery needs to be recharged immediately.
Battery Indicator

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5.8 Time Indicator
The time is shown as bellow:
Time indicator
5.9 Error Code Information
If there is something wrong with the electronic control system, the error code will appear
automatically. Here is the detail information of the error code in Table 1 attached.
Error display
Make the display repaired when error code appears.
5.10 General Setting
Press [MODE] button to start the display, then hold both [UP] and [DOWN] for 2 seconds to
enter the setting menu.
5.10.1 Clock Setting
Select the hour value by [UP] / [DOWN], press the MODE key to confirm and enter the minute
setting; Select the minute value by [UP] /[DOWN], press the MODE key to confirm and enter
the next setting.
Set hours Set minutes

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5.10.2 Backlight Contrast
BL means backlight. Level 1 is the low brightness. Level 2 is the middle brightness. Level 3 is
high brightness. The default level is 1. Press [UP]or [DOWN]to modify the backlight
brightness. Hold [MODE]to confirm the modification and exit the general
Backlight level
5.10.3 Show Units
The parameter metric/imperial system can be set. The meter works in metric system by
default. The metric parameter can be changed by [UP] / [DOWN].
Metric Imperial
5.10.4 Trip Distance Clearance
TC means trip distance clearance. Setting parameters can be N/Y. The default N means that
the mileage of a single ride is not zero. Y/N can be selected through [UP] / [DOWN]. Y means
that the mileage of a single ride needs to be cleared, while N means that the mileage of a
single ride does not need to be cleared.
TRIP Clearance
5.10.5 Exit setting
In the setting state, short press the [MODE] to confirm the input and enter the next setting;
long press the [MODE] to save and exit the setting state.

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5.11 Power-on Password Enable/Disable
The character “PSD.2” on the bottom of the screen means the page of password. Hold [UP]
and [DOWN]both up to 2 seconds enter normal setting , while hold both [UP]and [MODE]2
seconds again will enter power-on password enable/disable page.
Press [UP]/[DOWN] to change the number .Press [MODE] to select digit one by one. After
4-digite of the correct password entered, press [MODE] to confirm then select password
enable or disable.
Password Entering Page
5.11.1 Power-on Password Enable
Press [UP]/[DOWN] to select Y or N, and press [MODE] to confirm. Power-on Password
default disable.
Set Power-on Password
5.11.2 Power-on Password Modify
[UP]and [DOWN] is to change the number, and [MODE] is to select digit one by one,
finally to hold [MODE] to confirm the modification.
Password Modify Page
5.12 Normal Parameter Setting
The screen prompts "PSD.1", indicating that the permission password needs to be entered.

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Press the [MODE] to shift, and add/subtract the input value by [UP] / [DOWN]. After the
4-digit password is inputed, press [MODE] to confirm.
If the password is correct, enter the power-on password enabled setting interface; otherwise,
stay in the password input state. Long press [MODE] to exit. The permission password is:
0512.
Normal Parameter Setting Page
5.12.1 Wheel Diameter Setting
LD means Wheel Diameter. Press [UP] and [DOWN] to select the correct value to match the
wheel diameter. Selectable values include: 16, 18, 20, 22, 24, 26, 700C, 28, 29. Default
diameter is 26 inch.
Wheel Diameter Setting Page
5.12.2 Speed-limit Setting
When the running speed is faster than MAX SPEED, the controller will cut off the motor power.
MAX SPEED default setting is 25Km/h. LS means Limit Speed 12Km/h to 40Km/h is
selectable. Press UP/DOWN to select the favorite value, then hold MODE over 2 seconds to
confirm and quit the setting mode.
Limit Speed Setting Page
5.13 Personalized Parameter Setting
Personalized Parameter Setting can match variety requirements in use. Settings items are:
Battery Power Bar Setting, Pedal assistant level Setting, Over-current Cut , Pedal Assistant

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Sensor Setting, Speed Sensor Setting and Delay Time Setting. For the details, please see the
Attached List 3.
5.13.1 System Parameter Setting
Hold [UP] and [DOWN] both over 2 seconds to enter normal setting, while hold [UP] and
[DOWN] both again is to set up System Parameter, password 2962 must be entered.
[MODE] is to confirm and enter System Parameter Setting page, you can select the option
which you want.
System Parameter Password Input
Press [UP]/[DOWN] to select, and press [MODE] to enter the corresponding setting page.
Option Select Page
5.13.2 Battery Power Bar Setting
Each bar represents a voltage value. 5 voltage values must be entered one by one.
Press [MODE] to confirm and [UP]/[DOWN] to select the value.
VOL = voltage
Battery Power Bar Setting
5.13.3 Pedal Assistant Level Setting
Pedal Assistant Level Select
SCA stands for booster parameter setting. 8 modes are provided in the selection of power

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gear: 0-3, 1-3, 0-5, 1-5, 0-7, 1-7, 0-9, 1-9. Through the switch of [UP] / [DOWN], press [MODE]
to confirm and enter the corresponding power ratio numerical setting interface.
PAS Mode Select Page
PAS Ratio Modify
To modify the value of PAS ratio will meet the different requirements.
Take the 1 level for example, “30-50 percent” is the range value, bottom value can be
modified, and the default is 40 percent. [MODE]is used to confirm and turn to the next PAS
ratio setting. After all PAS ratio inputted, please hold [MODE]over 2 seconds to confirm the
modification and turn to controller Over-current Cut setting [MODE]back to pedal assistant
level select page). For the details, please see Attached List 4.
PAS Ratio Page
5.13.4 Controller Over-Current Cut Setting
CUR means current. CUR value can be changed from 7.0A to 18.0A. Press [UP]/[DOWN] is
to change the value of the current, and hold [MODE] to confirm the setting and turn to PAS
sensor setting.15A is the default value of controller over-current cut.
CUR Setting Page
According to the different controller, the value might not be able to be 18A.
5.13.5 Pedal Assistant Sensor Setting
The Direction of Pedal Assistant Sensor Setting
PRS means Pedal Assistant System. “run-F” means forward direction, while “run-b” means

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back direction. Press [UP]/[DOWN] to select F or b, and press [MODE] to confirm and turn to
PAS sensitivity setting. The default direction is forward.
Direction of PAS Sensor Setting
The Sensitivity of PAS Setting
SCN means the sensitivity of PAS, and 2 to 9 can be selected.2 is strongest, 9 is the weakest.
[UP]/[DOWN] is to select sensitivity value, and [MODE] is to confirm selection and turn to
magnet disk setting. SCN default value is 2.
The Sensitivity of PAS Setting
Proportion parameters Setting Of PAS
N means the proportion parameter of PAS. Press [UP]/[DOWN]to select the parameter, the
more power, the more PAS feeling.
Proportion parameter of PAS
5.13.6 Speed Sensor Selection
SPS means Speed Sensor. Press [UP]/[DOWN] to select the quantity of magnet head (the
range is from 1 to 9), and press [MODE]to confirm and turn to Throttle Definition page. SPS
default value is 1
Speed Sensor Selection

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5.13.7 Throttle Definition
Throttle Enable/Disable
Hnd means throttle load, HL:N means function disable ,HL:Y means function enable .
When HL=Y, throttle can control the function. Press [UP]/[DOWN] to select Y, and press
[MODE]to confirm the selection, otherwise select N to turn to Throttle Vector Enable Setting.
HL default value is N.
Throttle Enable/Disable Page
Throttle Vector Enable/Disable
HF means throttle. HF：Nmeans throttle vector disable. When HF=Y, turn throttle to change
the running speed. Press [UP]/[DOWN] to select Y or N, and hold [MODE]to confirm the
selection and quitting. Press [MODE]to confirm and turn to throttle definition page.
Throttle Vector Enable/Disable Page
5.13.8 System Setting
Delay time setting of battery power
DY means delay time of battery power. Choose delay time 3/6/12s through pressing
[UP]/[DOWN], then shortly press [MODE], and enter the max speed limited. The default time
is 3s.
Delay time of battery power interface
Max speed limited
SP means max speed limited. Set the max speed when pressing [UP]/[DOWN]from 25-40
Km/h. Long time to press [MODE], then exit setting. The default is 40Km/h.

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Interface of max speed limited setting
The standard speed limit setting is based on this setting, not more than this
setting value. This setting is the priority version.
Button PAS Setting
PUS means pushing. Press UP/DOWN to choose Y/N. Short press MODE, Y means enable,
N means disable. Short press MODE to confirm and enter into PAS speed setting. The default
value is Y.
Interface of PAS pushing
PAS Speed Setting
PU means pushing. Through setting PAS to adjust push speed to meet rider’s requirements.
The scope is “20%-35%”by pressing UP/DOWN, short press MODE to enter into slowly start
up. Default value is 25%.
Interface of PAS speed setting
Slowly Start up Setting
SSP means slowly start up. The scope is 1-4, 4 means the slowest. Press [UP]/[DOWN ]to
choose. Long press [MODE] to confirm and exit setting. The default value is 1.
Interface of slowly setting up
5.13.9 Exit setting
In the setting state, short press [MODE] is to confirm the input. Long press [MODE]is for

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saving the setting, then quit the setting state. Long press [DOWN], is to cancel the operating
but not saving setting data.
If there is not any operating in one minute, display will exit the setting state.
5.14 Recover default setting
DEF means recover default. Both press [UP] + [MODE] to enter recover default setting.
Pressing [UP],[DOWN]to convert Y or N. Y means do need to recover default setting; Y
means entering into password setting. Otherwise, display will exit. The default state is N.
Restore Default Setting Interface
Input password: 0368. Short press [MODE], [UP]/[DOWN] can increase or reduce the number.
After inputting 4 passwords, short press [MODE]to confirm. The interface is as below. When
display showed DEF: 00, it means recovering default state, then exiting.
Enter number interface page
In the recovery default, battery power, ODO and trip can not be recovered, but
starting up password can be recovered.
Recover default interface
6. Preparation before Starting
Make sure all connectors tightened and the cables without damage.