S866 LCD Display for Electric Bikes
The S866 LCD Display is designed as a replacement or conversion display for compatible electric bike controllers using the UART #2 communication protocol.
It is available with either an SM plug or a waterproof plug.
Before ordering, please check both your controller communication protocol and connector type. A connector that looks similar does not guarantee compatibility.
This S866 display is not a universal e-bike display.
Your controller must use the compatible UART #2 communication protocol, and the display connector must match your existing wiring.
Choose the Correct S866 Connector
| Option | SKU | Before Ordering |
|---|---|---|
| SM-Plug | LCD-S866-SM | Choose this version only if your existing display/controller uses the matching SM connector. |
| WP-Plug | LCD-S866-WP | Choose this version only if your existing wiring uses the matching waterproof connector. |
Do not select the display by voltage alone.
Always confirm the controller protocol and connector type first.
S866 Display Specifications
| Model | S866 LCD Display |
| Communication Protocol | UART #2 |
| Voltage Settings Listed | 24V / 36V / 48V |
| Connector Options | SM Plug / Waterproof Plug |
| Handlebar Diameter | 22.2mm |
| Display Type | Segment LCD |
| Material | ABS / Acrylic |
| Color | Black |
| Water Resistance | IP65 |
Before You Order
- Confirm the controller protocol. Your controller must use the compatible UART #2 communication protocol.
- Check the connector. Compare your existing display plug with the SM-Plug and WP-Plug options before selecting.
- Confirm system voltage. The current S866 parameter information lists 24V, 36V and 48V settings.
- Check the handlebar mounting position. The supplied specification lists a 22.2mm holder diameter.
- Do not rely only on the display model name. Different e-bike controllers may use different communication protocols or wiring even when the display looks similar.
If you are unsure, compare the connector and controller label with your original parts before ordering. You can also contact us with clear photos of the original display connector and controller label for a compatibility check.
What’s Included
- 1 × S866 LCD Display
- 1 × Manual
S866 P-Parameter Settings
The S866 includes configurable riding and display parameters. Settings can vary depending on the controller and e-bike configuration, so record your original settings before making changes.
| Parameter | Function |
|---|---|
| P01 | Backlight brightness: 1 = darkest, 3 = brightest. |
| P02 | Mileage unit: 0 = KM, 1 = MILE. |
| P03 | Voltage level setting: 24V / 36V / 48V according to the current product information. |
| P04 | Sleep time. 0 = never; other values represent time in minutes. |
| P05 | Assist level / gear setting. Use the included manual and controller configuration when adjusting this parameter. |
| P06 | Wheel diameter setting in inches, 0.5-inch increments. |
| P07 | Magnet number setting: 1–100. |
| P08 | Speed limit setting: 0–50 km/h. The current manual states 50 means no speed limit. |
| P09 | Start mode: 0 = zero start, 1 = non-zero start. |
| P10 | Drive mode: assist drive, electric drive, or combined assist/electric drive. |
| P11 | Assist sensitivity setting range: 1–24. |
| P12 | Assist start intensity setting range: 0–5. |
| P13 | PAS magnet setting: 5 / 8 / 12 magnets. |
| P14 | Controller current limit setting. Current product information lists a 1–20A range and 12A default. |
| P15 | No function listed in the current product information. |
| P16 | ODO reset. Press and hold the specified button for approximately 5 seconds to clear ODO. |
S866 Error Codes
| Code | Meaning |
|---|---|
| E0 | Normal |
| E1 | Reserved |
| E2 | Brake |
| E3 | PAS sensor / riding signal fault |
| E4 | 6 km/h cruise |
| E5 | Real-time cruise |
| E6 | Low battery |
| E7 | Motor / Hall-related fault indication |
| E8 | Throttle failure |
| E9 | Controller failure |
| E10 | Communication receiving failure. Check protocol compatibility, wiring order and connector pins. |
| E11 | Communication sending failure |
| E12 | BMS communication failure |
| E13 | Light failure |
Need a Controller as Well?
If your existing controller does not use the correct communication protocol, replacing only the display may not solve the problem. In that case, choosing a matched controller-and-display set is safer than pairing the S866 with an unknown controller.
- S866 Controller Options – 3-Pin E-Brake Versions
- S866 Controller Options – 2-Pin E-Brake Versions
- Complete E-Bike Controller Kit with LCD Display & Accessories
Frequently Asked Questions
Is the S866 display universal?
No. The display and controller must use a compatible communication protocol. This product uses UART #2, so please confirm your controller before ordering.
What is the difference between SM-Plug and WP-Plug?
They are different connector versions of the S866 display. Choose the version that matches your existing controller wiring and connector.
Can I replace my old display with an S866 just because the connector fits?
Not necessarily. A matching connector does not guarantee that the controller and display use the same communication protocol.
What does S866 error code E10 mean?
The current product information identifies E10 as a communication receiving failure. Check controller protocol compatibility, wiring order and whether the connector pins are secure.
What is included with the display?
The package includes one S866 LCD display and one manual.
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