Displays and P-menus
SW900 LCD (King-Meter / KingMeter)
Sourced
Entering the menu
Power on: hold M for 4–5 s. Settings: hold Up and Down together for 4–5 s.
Parameters
| P-no. | Parameter | Values | Status |
|---|---|---|---|
| P01 | Backlight | 1 = darkest … 3 = brightest | Sourced |
| P02 | Distance unit | 0 = km, 1 = mile | Sourced |
| P03 | Voltage class | 24 V / 36 V / 48 V / 52 V – must match battery and kit voltage | Sourced |
| P04 | Sleep time | 0 = never; 1–60 min | Sourced |
| P05 | PAS levels | 0 = 3 levels, 1 = 5 levels (S830 also has a 9-level option) | Sourced |
| P06 | Wheel size | in inches, 0.1 precision | Sourced |
| P07 | Speed magnet count | 1–100 (the source's examples depend on motor type – use your motor's data) | Sourced |
| P08 | Speed limit | 0–50 km/h; 100 = no limit (local law applies!) | Sourced |
| P09 | Zero / non-zero start | 0 = zero start, 1 = non-zero start | Sourced |
| P10 | Drive mode | 0 = PAS only, 1 = throttle only, 2 = PAS + throttle | Sourced |
| P11 | PAS sensitivity | 1–24 (1 = most sensitive) | Sourced |
| P12 | PAS start strength | 0–5 | Sourced |
| P13 | PAS magnet disc type | 5, 8 or 12 magnets; default 8 | Sourced |
| P15 | No function | Not implemented according to the source | Sourced |
| P16 | ODO reset | Long-press the upper key for 5 s – note the odometer first on customer jobs | Sourced |
| P17 | No function | Not implemented according to the source | Sourced |
For 1 parameter(s) the sources contradict each other – we do not publish those as values.
Safe workflow
- Photograph the display label and EVERY original P-value before changing anything.
- Record the controller model, battery nominal voltage, motor and speed-sensor type.
- Find the manual for the exact display + controller; another model's table does not carry over.
- Change one parameter at a time and test on a stand with the wheel raised (brake cut-off, start, every PAS level).
- Never raise the current limit above controller/motor/battery/BMS ratings, never lower undervoltage protection, never bypass the local speed limit.
Common problems
- Inaccurate speed: wheel size, magnet/pulse count, sensor gap and cable; identify the right P-number only from the manual.
- No communication / code 30: protocol (e.g. S866 P20), connector pins, voltage class and display–controller compatibility. Same connector ≠ compatible.
- Wrong battery gauge: the voltage-class parameter (e.g. SW900 P03) must match the real battery; measure with a multimeter first.
- Delayed or intermittent PAS: magnet disc type/count (e.g. SW900 P13), sensitivity, gap and sensor orientation.