Yolin

Table of Contents

1. Product name and model
2. Specifications
3. Appearance and dimensions
4. Function overview and functional area layout
   • Function overview
   • Functional area layout
   • Button definitions
5. General operation
   • Power on/off
   • Display interface
   • Push assistance
   • Headlight on/off
   • Assist level selection
   • Battery level indicator
   • Error code indicator
6. General setting
   • Trip distance reset
   • Factory reset
7. Custom setting
   • Rated voltage setting
   • Wheel diameter setting
   • Speed limit setting
   • Metric/imperial system setting
   • Speed sensor setting
   • Current limit setting
   • Assistance sensor setting
   • Power-on password setting
8. Quality commitments and warranty scope
   • Warranty information:
   • Non-warranty scope
9. Outgoing line connection diagram
   • Wiring sequence of standard connector
10. Considerations

1. Product name and model

Intelligent LCD display for e-bike; model: YL81C.

2. Specifications

• 36V/48V power supply
• Rated working current 15mA
• Maximum working current 30mA
• Leakage current at power-off <1uA
• Working current at the supply controller end 50mA
• Working temperature -20~60℃
• Storage temperature -30~70℃

3. Appearance and dimensions

The display features a modern LCD screen. The dimensions are approximately 48.5mm in height and 70.0mm in width, with a mounting diameter of approximately 22.2mm. The side view shows a depth of approximately 37.0mm.

[Description of Fig. 3-1: Picture of Display 81C: A close-up view of the Yolin YL81C-B e-bike display, showing the screen with speed, battery, and mode indicators.]

[Description of Fig. 3-2: Top View of Display 81C Dimensions: A diagram showing the top view of the display unit with dimensions indicated, including a 22.2mm diameter for handlebar mounting.]

[Description of Fig. 3-3: Side View of Display 81C Dimensions: A diagram showing the side profile of the display unit with overall width and depth dimensions.]

4. Function overview and functional area layout

4.1 Function overview

The Display YL81C provides a variety of functions to meet the riding needs of users, including:

• Battery level indicator
• Assist level adjustment and indication
• Headlight indicator
• Speed indicator (including real-time speed, maximum speed (MAXS) and average speed (AVG))
• Distance indicator (including ODO and trip distance (Trip))
• Error code indicator
• Bluetooth connection indicator (reserved)
• Parameter setting function

4.2 Functional area layout

The main display area shows:

• Battery Level Indicator: Visual representation of battery charge.
• Speed Indicator: Displays current speed, with units selectable between km/h and MPH.
• Assist Level Indicator: Shows the current motor assist level (e.g., PAS 3).
• Maximum Speed (MAXS): Displays the recorded maximum speed.
• Average Speed (AVG): Displays the recorded average speed.
• Trip Distance Indicator: Shows the distance for the current trip (TRIP).
• ODO: Displays the total accumulated distance.
• Bluetooth Indicator: (Reserved function).
• Headlight Indicator: Shows when the headlight is active.
• Speed Unit: Indicates the selected unit (km/h or MPH).
• Distance/Speed Unit: Indicates selected units for distance (km/mile) and speed (km/h, MPH).

[Description of Fig. 4-1: Functional Area Layout Interface of Display YL81C: A diagram illustrating the layout of the display screen, showing the positions of the battery indicator, speed display, assist level, trip/ODO, MAXS, AVG, and various icons.]

4.3 Button definitions

There are three buttons on the operating unit of display YL81C:

• On/Off Button: Used for powering the display on/off.
• Plus Button: Used for increasing values or navigating forward.
• Minus Button: Used for decreasing values or navigating backward.

5. General operation

5.1 Power on/off

To power on the display and the e-bike's controller, press and hold the On/Off Button [power-symbol]. To power off the e-bike, press and hold the On/Off Button [power-symbol] again. When powered off, the display consumes less than 1uA leakage current. The display will automatically power off if the e-bike is not used for more than 10 minutes.

5.2 Display interface

Upon powering on, the display defaults to showing the real-time speed (km/h) and trip distance (km). Pressing the Plus Button [+] cycles through trip distance (km), ODO (km), maximum speed (km/h), and average speed (km/h). The ODO meter resets to zero when it reaches 9999.9 km.

[Description of Fig. 5-1: Display Interface Switching: Illustrates the cycling through different display modes: Trip distance, ODO, Average speed, and Maximum speed.]

5.3 Push assistance

Press and hold the Plus Button [+] to activate the electric push assistance mode. The e-bike will maintain a constant speed of 6km/h, indicated by 'P' on the display. Releasing the Plus Button [+] will stop the power output and return to the previous state.

[Description of Fig. 5-2: Push Assistance Indicator Interface: Shows the display indicating 'P' for push assistance mode.]

5.4 Headlight on/off

Press and hold the Minus Button [-] to turn on the headlights and dim the display backlight. Press and hold the Minus Button [-] again to turn off the headlights and restore the display's normal brightness.

[Description of Fig. 5-3: Headlight-on Indicator Interface: Shows the display with the headlight icon active.]

5.5 Assist level selection

Press the Plus Button [+] or Minus Button [-] to cycle through and select the motor assist level. Available levels include ranges such as 0-3, 1-3, 0-5, 1-5, 0-7, 1-7, 0-9, and 1-9.

[Description of Fig. 5-4: Assist Level Switching Interface: Depicts the display showing the current assist level, e.g., 'PAS 3'.]

5.6 Battery level indicator

The battery level is indicated by five segments. All five segments are illuminated when the battery is fully charged. If the battery voltage is low (undervoltage), the outline of the battery indicator will flash, signaling the need for immediate charging.

[Description of Fig. 5-5: Battery Level Indicator Interface: Shows different states of the battery indicator: Full, 4-segment, 3-segment, 2-segment, 1-segment, and Undervoltage flashing.]

5.7 Error code indicator

If a fault occurs in the e-bike's electronic control system, an error code will be displayed in the distance area in the format E0**. Detailed definitions of error codes are provided in Schedule 1.

[Description of Fig. 5-6: Error Code Indicator Interface: Shows an example error code 'E002' displayed on the screen.]

When an error code appears, troubleshoot promptly to ensure normal operation of the e-bike.

6. General setting

All parameters can only be set when your e-bike is stationary (speed is 0). The steps for general setting are as follows:

6.1 Trip distance reset

Press and hold both the Plus Button [+] and the Minus Button [-] simultaneously for more than 2 seconds to reset the trip distance.

6.2 Factory reset

dEF indicates factory reset. dEF-n means not to restore factory settings, and dEF-y means to restore factory settings. Press and hold both the Plus Button [+] and the Minus Button [-] simultaneously for more than 2 seconds to enter the factory reset interface. Then, press the Minus Button [-] to select a parameter.

[Description of Fig. 6-1: Factory Reset Interface: Shows the display indicating 'dEF-n' or 'dEF-y' for factory reset options.]

7. Custom setting

All parameters can only be set when your e-bike is stationary (speed is 0). The steps for custom setting are as follows:

1. Press and hold the Plus Button [+] and the Minus Button [-] simultaneously for more than 2 seconds to enter the selection interface of custom setting options.
2. Press the Minus Button [-] to switch the selection interface of general setting options, and press the On/Off Button [power-symbol] to enter the parameter modification interface.
3. Press the Minus Button [-] or Plus Button [+] for parameter selection.
4. Press the On/Off Button [power-symbol] to save the parameter and return to the selection interface of custom setting options.
5. Press and hold the On/Off Button [power-symbol] to save the parameter and exit the selection interface of custom setting options.

7.1 Rated voltage setting

P1 refers to the rated voltage setting option. Available values include: 36V and 48V. Press the On/Off Button [power-symbol] to enter the parameter modification interface. Press the Minus Button [-] or Plus Button [+] for parameter selection. Press the On/Off Button [power-symbol] to save the parameter and return to the selection interface of general setting options.

[Description of Fig. 7-1: Rated Voltage Setting Interface: Shows the display indicating 'P1' and the selected voltage, e.g., '36V'.]

7.2 Wheel diameter setting

P2 refers to the wheel diameter setting option. Available parameters include: 8-32 inches. Press the On/Off Button [power-symbol] to enter the parameter modification interface. Press the Minus Button [-] or Plus Button [+] for parameter selection. Press the On/Off Button [power-symbol] to save the parameter and return to the selection interface of general setting options.

[Description of Fig. 7-2: Wheel Diameter Setting Interface: Shows the display indicating 'P2' and the selected wheel diameter, e.g., '20 in'.]

7.3 Speed limit setting

P3 represents the speed limit setting option. The adjustable range is 10~40km/h. Press the On/Off Button [power-symbol] to enter the parameter modification interface. Press the Minus Button [-] or Plus Button [+] for parameter selection. Press the On/Off Button [power-symbol] to save the parameter and return to the selection interface of general setting options.

[Description of Fig. 7-3: Speed Limit Setting Interface: Shows the display indicating 'P3' and the set speed limit, e.g., '25 Km/h'.]

7.4 Metric/imperial system setting

P4 refers to the metric/imperial system setting option. 00 represents the metric system, and 01 represents the imperial system. Press the On/Off Button [power-symbol] to enter the parameter modification interface. Press the Minus Button [-] or Plus Button [+] for parameter selection. Press the On/Off Button [power-symbol] to save the parameter and return to the selection interface of general setting options.

[Description of Fig. 7-4: Metric/imperial System Setting Interface: Shows two examples: Metric system indicator interface with '00' and Imperial system indicator interface with '01'.]

7.5 Speed sensor setting

P5 refers to the speed sensor setting option, which can be set according to the number of magnetic heads installed on the wheels of your e-bike. The setting range is 1-63. Press the On/Off Button [power-symbol] to enter the parameter modification interface. Press the Minus Button [-] or Plus Button [+] for parameter selection. Press the On/Off Button [power-symbol] to save the parameter and return to the selection interface of general setting options.

[Description of Fig. 7-5: Speed Sensor Setting Interface: Shows the display indicating 'P5' and a selected value, e.g., '01'.]

7.6 Current limit setting

P6 refers to current limit setting. The adjustable range is 1-25A. Press the On/Off Button [power-symbol] to enter the parameter modification interface. Press the Minus Button [-] or Plus Button [+] for parameter selection. Press the On/Off Button [power-symbol] to save the parameter and return to the selection interface of general setting options.

[Description of Fig. 7-6: Current Limit Setting Interface: Shows the display indicating 'P6' and a selected current limit, e.g., '13'.]

7.7 Assistance sensor setting

P7 refers to the assistance sensor setting option, where the number of steel magnets of the assistance magnetic disk can be set. The adjustable range is 5, 6, 7, 8, 9, 10 and 12. Press the On/Off Button [power-symbol] to enter the parameter modification interface. Press the Minus Button [-] or Plus Button [+] for parameter selection. Press the On/Off Button [power-symbol] to save the parameter and return to the selection interface of general setting options.

[Description of Fig. 7-7: Assistance Sensor Setting Interface: Shows the display indicating 'P7' and a selected number of magnets, e.g., '12'.]

7.8 Power-on password setting

P8 refers to the power-on password setting option. PSd-Y means that a power-on password is required, and PSd-N means that no power-on passwords are required. The default value of the display is PSd-N. Press the On/Off Button [power-symbol] to enter the modification interface, and press the Minus Button [-] or Plus Button [+] to enter the selection interface.

• If PSd-N is selected, press the On/Off Button [power-symbol] to return to the selection interface of custom setting options.
• If PSd-Y is selected, press the On/Off Button [power-symbol] to enter the password setting interface. If you don't want to change the password, press and hold the On/Off Button [power-symbol] to exit the custom setting interface. If you want to change the password, press the Minus Button [-] for cursor movement and the Plus Button [+] for figure selection, and then press the On/Off Button [power-symbol] to return to the selection interface of custom setting options.

[Description of Fig. 7-8: Power-on Password Setting Interface: Shows the display indicating 'P8' and the password setting status, e.g., 'PSd-n'.]

8. Quality commitments and warranty scope

8.1 Warranty information:

• For faults caused by the quality of the product under normal use, Tianjin Yolin Technology Co., Ltd. will provide a limited warranty during the warranty period.
• The warranty period of the product is within 12 months from the date of delivery.

8.2 Non-warranty scope

• The enclosure has been opened.
• The connector is damaged.
• The enclosure is scratched or damaged after delivery.
• The outgoing line of the display is scratched or broken.
• Faults or damage caused by force majeure (such as fires, earthquakes, etc.) or natural disasters (such as lightning strikes, etc.).
• The warranty period has expired.

9. Outgoing line connection diagram

9.1 Wiring sequence of standard connector

The display connects to the controller via a standard connector. The diagram shows the connecting terminal to the controller, the leading-out terminal of the display, and the connecting terminal with projection and groove features.

[Description of Fig. 9-1: Outgoing Line Connection Diagram: Visual representation of the display's connector and its connection to the controller.]

Note: Some products use waterproof connectors where the wire colors may not be visible inside the harness.

10. Considerations

• Please use safely and avoid plugging or unplugging the display while it is powered on.
• Please avoid bumping the display as much as possible.
• Do not alter the background parameter settings of the display arbitrarily, as this may affect normal riding performance.
• If the display fails to work normally, it should be repaired as soon as possible.
• Due to product upgrades by Tianjin Yolin Technology Co., Ltd., some displayed contents or functions may differ from this manual, depending on the actual model.

Schedule 1 Error Code Definitions

Error codes for protocols YL-01 and YL-02:

Error codes for protocols YL-05, KDS and YL-J: