King-Meter SW-LCD User manual

KING-METER
USER GUIDE
SW-LCD

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Contents
1. Preface ………………………………………….3
2. Appearance and Size……………………………4
2.1 Material and Color……………………………4
2.2 Display Size and Installation Size …………4
3. Function Summary and Button Definition…5
3.1 Preset and Default Items ……………………. 5
3.2 Display Figures ……………………………… 5
3.3 Button Definition…………………………..… 6
4. Installation Instruction………………………….7
5. Set up …………………………... ………………..7
5.1 Preparation before Starting the Display………7
5.2 Start and Entry Setting State…………………7
5.3Wheel Diameter………………………….. 7
5 . 4 M a x S p e e d … … … … … … … … … … … … 8
5.5 Backlight Brightness.………………………...9
5.6 Choice of Display Unit… ……………………9
5.7 Quit from Set up……………………………...10
6. Standard operation……………………………..10
6.1 Power ON / OFF...……………………………10
6.2 Power Display…...…………………………………. 10
6.3 Speed Display (Current Speed/Average Speed/Max
Speed)………………………………………………11
6.4 Assisted Power Select or Throttle Level
Select ………………………………………………. 12
6.5 Distance Display …………………………………..13

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6.6 Push cruise control………… ………………...13
6.7 Turn On and Turn Off the Backlight…………14
6.8 Power of the Display……………………………… .14
6.9 Error Code Display……………………….......15
7. Attention for Using…………….…….16
8. FAQ Answers…………………………………16
9. Quality Warranty and Coverage…………….17
10. Circuit Block Diagram…................................17
11. Software Version …………………………17

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1、Preface
Dear users,
To ensure better performance of your e-bike, please read
through the SW-LCD product introduction carefully before
using it. We will use the brief words to inform you of all the
details （including hardware installation, setting and normal
use of the display）when using our display. Meanwhile, the
introduction will also help you solve possible confusion and
barriers.

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2、Appearance and Size
2.1 Material and Color
SW-LCD housing material: PC. And the color of housing is
white or black. Working temperature scope: -20℃—+60℃,
the shell material can ensure normal use and good
mechanical performance of the products.
2.2 Display Size and Installation Size（Unit：mm）

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3、Function Summary and Button Definition
3.1 Preset and Default Items
SW-LCD user settings include: wheel diameter
（18-28inch）; max speed; LCD backlight contrast;
choice of display unit.
3.2 Display Figures:
Display content: battery capacity, motor power ratio,
riding speed, riding distance, power, PUSH cruise
control, and error code display of the electronic control
system.

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3.3 Button Definition
SW-LCD is equipped with special 30-button unit. This
operating button is suit for both L/R hand, button instruction
figures as follows:
30-button unit is connected to the bottom of the SW-LCD
display via lead cable.
In the following introduction, is named as
“MODE”. is named as “UP” and is
named as “DOWN”.

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4、Installation Instruction
Fix the display and 30-button unit on the handlebar and
adjust to an appropriate visual angle. Match display
connector with controller connector.
5、Set up
5.1 Preparation for Starting the Display
Make sure connector linked properly to the motor controller
on the bike.
5.2 Start and Entry Setting State
Press the MODE button for 1.5 seconds and start the
display.
After start-up, please hold both UP and DOWN for 2.5
seconds at the same time, LCD will enter into the setting
state，and the settable parameter will flash. The parameter
can be set circularly.
5.3 Wheel Diameter
The first setting parameter is wheel diameter. The interface
is as follows:

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Press UP or DOWN to choose a right diameter（18-28inch）
for the bike. Default set is 26 inch. After confirmation of
wheel size, press MODE to reserve it and enter into the max
speed set.
5.4 Max Speed
The second setting parameter is Max Speed. The interface
is as below:
Re-set speed should be in accordance with the local
regulation speed. If exceed your re-set figure, the bike will
travel at the max speed of reset. Default max speed in

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factory is 25 Km/h.
Speed option: 12-40Km/h, use UP or DOWN then confirm
by MODE. Then enter into the interface of backlight
brightness.
5.5 Backlight Brightness
The third setting parameter is backlight brightness. The
interface is as below:
Press UP or DOWN to modify the backlight brightness. You
can choose from level 1 to level 3. Level 1 is the minimum
brightness. Level 3 is the maximum brightness. The default
value of the backlight brightness is level 1. Press the MODE
to confirm the backlight brightness, then entry into the
interface of Choice of Display Unit.
5.6 Choice of Display Unit (Metric system / British system)
The fourth setting parameter is Choice of Display Unit. The
interface is as below:

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Press UP or DOWN to choose a display unit.
The unit could be MPH or Km/H. The range unit will change
accordingly with the speed unit.
5.7 Quit from set up
In the setting state, press MODE for 3 seconds to confirm
the input, save current setting and exit.
6、Standard Operation
6.1 ON / OFF
Press MODE, then the display starts to work and supply
power to controller, long press MODE then switch off power.
In the status of OFF, display and controller no longer
consume battery power.
6.2 Capacity Display
When the battery capacity is high, the five battery segments
are all light. When the battery is in low voltage, the last

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battery segment will flash at 1 Hz. It indicates that the
battery is severely low in voltage condition and needs to be
recharged immediately.
Low Voltage Flash
6.3 Speed Display (Current Speed/Average Speed/Max
Speed)
When the e-bike starts, the display will automatically show
the current speed.
Hold UP and the display will show the MAX speed during
this ride. Hold UP again and the display will show the AVG
speed during this ride. Hold UP again and the display will
turn to the current speed display.

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The interface of switching speeds
6.4 Assisted Power Select or Throttle Level Select
Press UP or DOWN tochange the output power of the motor.
The power ranges from Level 1 to Level 5. Level 1 is the
minimum power. Level 5 is the maximum power.
The default level is Level 1.
The choice of motor power rate

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6.5 Distance Display (Riding Distance / Total Distance)
Press MODE to switch between riding distance and total
distance. This function is convenient for users to check the
riding distance (TRIP) and the total distance (ODO).
Range Interface
6.6 Push Cruise Control
Press DOWN for a while to get into power assist mode, and
the bike will travel at fixed speed 6Km/h.
Interface of power assist walk

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Warning：Push cruise control mode is recommended
under push state, not for riding mode.
6.7 Turn On and Turn Off the Backlight
Hold both UP and MODE for 3 seconds and turn on the
SW-LCD backlight, when the surrounding light is not enough
or it is in the evening. Hold both UP and MODE for 3
seconds again and you can turn off the SW-LCD backlight.
When the backlight power ON, the headlight also power on
(if the bike assembles with a headlight). And the function
could be customized.
6.8 Power of the Display
Display the real time power consumption of the riding for
electric bike. The interface below:

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6.9 Error Code Display
If there is something wrong with the electronic control
system, the display will show the error code automatically.
The following is the definition of the error code.
Code number
Definition
21
Abnormal current
22
Throttle fault
23
Motor phase problem
24
Motor Hall defect
25
Brake Failed
30
Abnormal Communication
Definition Diagram of Error Codes

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Error Code Display
Display return to normal only after problem being fixed and
bike will not run before fixing the problem.
7、Attention for Using
Ride your bike in a safe way. Don’t hit or knock the display.
Keep away from the bad environments when use, such as
downpour, large snowflakes and solarization.
Try not to use in under-voltage condition. The screen will get
dark along with the temperature reduction when
temperature below -10℃. The screen will return to normal
when the temperature rises again.
8、FAQ Answers
Q：Why can’t turn on the display?
A：Please check if the cable is well connected with the
controller.
Q：How to deal with the error code display?
A：Contact the e-bike maintenance station in time.

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9、Quality Warranty and Coverage
We are not responsible for the scratched or broken shell
after the products are delivered out of the factory.
We don’t repair scratched or broken lead wires.
The LCD display function warranty: 24 months from the
delivery time of the display out of the factory.
10、Circuit Block Diagram
Red: 24V/36V; Blue: lock wire; Black: GND; Green/ Yellow:
RX / TX wire.
Due to the use of the waterproof connector of part products,
users cannot see the leads color of the internal wiring.
11、Software Version
This operating instruction is a general-purpose software
(version V2.0). Some of the version of the e-bike LCD may
have slightly difference, all with actual use version.