KM529

KING-METER
USERS GUIDE
KM529
Contents
1 About the User Manual·····················································1
2 Appearance and Size························································2
3 Function Summary···························································· 3
4 Monitor Area·······································································4
5 Operation Cautions ························································· 4
6 Installation Instruction ····················································· 4
7 Normal Operation······························································ 4
7.1 Power On/Off·························································· 4
7.2 Speed Display (Real-time speed/Average speed/
Max speed)·······································································5
7.3 Turn on/off Backlight··············································5
7.4 Distance Display (Trip Distance/ Total Distance)6
7.5 PAS Level Selection·············································· 6
7.6 Battery Indicator····················································· 7
7.7 Error Code Information··········································7
8 General Setting.·································································9
8.1 Wheel Diameter Setting········································ 9
8.2 Speed-limit Setting·················································9
8.3 Backlight Contrast················································10
9 Connection layout····························································11
10 Barcode·············································································12
11 FAQ··················································································· 12
12 Quality assurance and warranty scope························13
13 Version changes······························································13
1
1. About the User Manual
Dear users,
To ensure better performance of your e-bike, please read
through the KM29 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.
2. Appearance and Size
KM529 products are made of 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)
-2-
3. Function Summary
KM529 provides a wide range of functions and indicators to fit

for users’ needs. The indicated contents are as follow.
◆Battery Indicator
◆Speed Display (including real-time speed, average speed and
max speed)
◆Trip distance and total distance
◆PAS Level Selection
◆Headlight On/Off
◆Error Code Indicator
◆Various Parameters Setting, such as wheel size,
speed-limited, backlight brightness and so on.
4. Monitor Area
KM529 Monitor Area
-3-
5. Operation Cautions
Be care of the safety use. Don’t attempt to release the connector

when battery is power on.
Try to avoid hitting.
Try to avoid wetting.
Make the display repaired when it doesn’t work normally.
6. Installation Instruction
Fix the display onto the handlebar and adjust to an appropriate

visual angle. Tighten all the connectors.
7. Normal Operation
7.1 Power On/Off
Press Button for 2 seconds then the display will power on,
and the controller will power on at the same time. With
display on, Press Button for 2 seconds to turn off power
system of the e-bike. With the display off, the display and
controller shut down. The leakage current of display on
shutdown state is less than 1μA
-4-
When the e-bike is without using for 10 minutes, the display will
shut down itself automatically.
7.2 Speed Display (Real-time speed/Average speed/ Max speed)
After starting up the display, default show is real-time speed.

Long press both and buttons for 2s to change the
indicated information in sequence as below: Real-time Speed
(Km/h) → Average Speed (Km/h) → Max Speed (Km/h).
Real-time speed Average speed Max speed
7.3 Distance Display (Trip Distance/ Total Distance)
After starting up the display, default show is Real-time speed.

Press button to change the indicated information in sequence
as below: Trip Distance (km) →Total Distance (km). Long press
the two buttons and , the trip distance will be reset to
zero.
Trip Distance (TRIP) Total Distance(ODO)

-5-
7.4 Turn on/off Backlight
Press button for 2 seconds to turn on the backlight of the

display, the headlight will be on at the same time. Hold Button
for 2 seconds again, backlight is off.
Turn On Backlight
7.5 PAS Level Selection
Press button or button to change 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
value is level 1.
PAS Level 1 PAS Level 2 PAS Level 5
-6-
7.6 Battery Indicator
The display shows the battery capacity in 5 levels. When the

battery is in high voltage, the word FULL will show on the top of
screen. When the battery is under-voltage, the letter E will be
shown on the bottom of screen and the LCD indictor will flash,
please charge the battery.
High voltage Low voltage
Under-voltage Flash
Battery indicator
7.7 Error Code Information
If there is something wrong with the electronic control system,

the error code will appear automatically. When error appears,
please check the corresponding part of e-bike or sent the
-7-
display to be repaired.
Error Code
Following is the detail information of error code：
Error
Definition Solution
Code
21 Current Abnormality Inspect if motor phrases short-circuits
22 Throttle Abnormality Inspect if throttle recover original state
Inspect if motor phrase is

well-connected;
23 Motor Abnormality
Inspect if lines are well-connected
between motor phrases and controller.
Non-Hall Controller ： Inspect if motor

Motor Hall Signal phrase is well-connected;
24
Abnormality Hall Controller：Inspect if motor hall is
well-connected.
Inspect if brakes original state before
25 Brake Abnormality
display startup.
Communication Inspect if lines are well-connected
30
Abnormality between display and controller.
-8-
8. General Setting
When the display power on, press both and buttons for 2
seconds to enter the setting menu. When the display is on status
of general setting, press the button for 2 seconds to quit
setting menu.
8.1 Wheel Diameter Setting
Press button or to select the correct value to match the

wheel diameter. Selectable values include: 16 inch、18inch、20
inch、22 inch、24 inch、26 inch、700C，28 inch。Default diameter
is 26 inch.
Press button to confirm the value of wheel diameter and
enter next setting at the same time.
Wheel Diameter setting
8.2 Speed-limit Setting
When the running real-time speed is faster than the value of

limited- speed you set, the controller will cut off the motor power
-9-
to protect the rider’s safety. Limited speed default setting value
is 25Km/h. the values of Limit-Speed range from 12Km/h to
40Km/h. Press or to select the favorite value, Press
to confirm. Then enter the next setting.
Limit Speed Setting
8.3 Backlight Contrast setting
“bL” means backlight. Level 1 is low brightness. Level 2 is the

middle brightness. Level 3 is high brightness. The default level is
1. Press button or to modify the backlight brightness.
Press button to confirm.
Backlight Brightness setting
- 10 -
9. Connection layout
Following is the standard connector of display to connect the

controller.
Standard Connector Display-side terminal Terminal of plug-in wire
Line sequence table

Line sequence Color Function
1 Red（VCC） Power +
2 Blue(K) Switch
3 Black(GND) Ground
4 Green(RX) Received Data
5 Yellow(TX) Transmitted Data
Some wire use the water-proof connector, users are not

able to see the inside color.
- 11 -
10. Barcode
The barcode is built up as follows:
KM529 = Name
000001=Sequence No.
12=Year of Production
06=Week of Production
3=Battery Voltage (2 is 24V, 3 is 36V, 4 is 48V)
1= Delivery form（1 is sample, 2 is mass production）
01=Hardware version No.
801=Software version No.
11. FAQ
Q: Why the display is not able to start up?

A: Check the connector between display and controller.
Q: How to deal with the error code?
A: Fix it to the maintenance place immediately.
- 12 -
12.Quality assurance and warranty scope
Ⅰ Warranty
1) In guarantee period, display itself appears any quality
problems when it is used correctly， our company will be
responsible for warranty.
2) The warranty time is 24 months when display out of the
factory.
Ⅱ Other items
The following items do not belong to our warranty scope.
1) It can not be demolished.
2) The damage is caused by wrong installation or operation.
3) Shell is broken when display is out of the factory.
4) Wire is broken.
5) The fault or damage is caused by the force majeure (such
as fire, earthquake, etc,) or natural disasters like lighting,
etc.
6) Beyond warranty period.
13. Version changes

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.
- 13 -

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KING-METER

KM529 products are made of PC. Under the temperature of -20

KM529 provides a wide range of functions and indicators to fit

KM529 Monitor Area

Be care of the safety use. Don’t attempt to release the connector

Try to avoid hitting.

Try to avoid wetting.

Make the display repaired when it doesn’t work normally.

Fix the display onto the handlebar and adjust to an appropriate

7.1 Power On/Off

7.2 Speed Display (Real-time speed/Average speed/ Max speed)

After starting up the display, default show is real-time speed.

Real-time speed Average speed Max speed

7.3 Distance Display (Trip Distance/ Total Distance)

After starting up the display, default show is Real-time speed.

Trip Distance (TRIP) Total Distance(ODO)

Press button for 2 seconds to turn on the backlight of the

7.5 PAS Level Selection

Press button or button to change the output power of

PAS Level 1 PAS Level 2 PAS Level 5

The display shows the battery capacity in 5 levels. When the

High voltage Low voltage

7.7 Error Code Information

If there is something wrong with the electronic control system,

22 Throttle Abnormality Inspect if throttle recover original state

Inspect if motor phrase is

Non-Hall Controller ： Inspect if motor

8.1 Wheel Diameter Setting

Press button or to select the correct value to match the

Wheel Diameter setting

8.2 Speed-limit Setting

When the running real-time speed is faster than the value of

Limit Speed Setting

8.3 Backlight Contrast setting

“bL” means backlight. Level 1 is low brightness. Level 2 is the

Backlight Brightness setting

Following is the standard connector of display to connect the

Standard Connector Display-side terminal Terminal of plug-in wire

Line sequence table

Some wire use the water-proof connector, users are not

Q: Why the display is not able to start up?

13. Version changes

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