BBS FLASH — Bafang UART Configurator

01 · Link

Connect to controller

Same UART wire protocol as the Penov/Penoff BafangConfigTool (1200 baud), rebuilt for Web Serial. Works in Chrome, Edge, or Opera on desktop. Plug in your USB–UART cable, then hit Connect and pick the port.

Session

Connect pings the controller for its General block (manufacturer, model, firmware, nominal voltage, max current) — same handshake the original tool performs.
Read all chains Basic → Pedal Assist → Throttle reads, exactly like the original "READ FLASH" button. Do this twice on first connect, per the community's own advice — the first read is sometimes a stale/garbage frame.

02 · Basic tab

Power, protection & assist table

Low battery cutoff, overall current ceiling, the 0–9 assist-level current/speed table, wheel size and speed-meter calibration.

Power limits

Low Battery Protection V Range depends on nominal pack voltage read from the controller.

Current Limit A Ceiling reported by controller sets the max here.

Wheel Diameter Only whole inches 16–30, plus 700C — a 27.5" tire has no exact entry, round to 27" or 28".

Speed Meter Type

Speed Meter Signals magnets

Assist levels 0–9

Level	Current %	Speed %

03 · Pedal Assist tab

Cadence response tuning

How the motor reacts to pedaling: sensor type, start behaviour, and how quickly it lets go when you stop — the parameter that protects your drivetrain during shifts.

Pedal Sensor Type

Designated Assist

Speed Limited

Start Current %

Slow-start Mode

Startup Degree signals

Work Mode raw, 10–80 Community consensus: negligible effect on BBS02 — safe to leave undetermined.

Time of Stop ×10ms Lower = motor lets go faster when you stop pedaling. Protects the chain during shifts. BBS02B may floor around 20.

Current Decay

Stop Decay ×10ms

Keep Current %

04 · Throttle Handle tab

Throttle behaviour

Voltage window, Speed vs Current mode, and its own independent assist/speed ceiling.

Start Voltage ×0.1V

End Voltage ×0.1V

Mode

Designated Assist

Speed Limited

Start Current %

05 · Profiles

.el files & community presets

Import/export is byte-for-byte compatible with the original tool's .el format — profiles saved here open fine in the Penov tool, and vice versa. Presets below load values into the fields only; nothing is sent to the controller until you press Write.

Load / Save .el file

Load .el file

Community presets (from the tuning comparison report)

06 · Physics estimate

Ride simulator — compare two profiles

Estimates top speed, hill-climb speed and launch feel from your settings using power-balance physics (P = drag + rolling resistance + grade force, at your controller's current draw). This is a comparison tool, not a dyno-calibrated prediction — treat the numbers as relative, not gospel.

Rider & bike parameters

Total mass (rider + bike + gear)115 kg

Climb grade for hill test8%

Effective pack voltage under load45 V

Drivetrain efficiency85%

Defaults assume ~95kg rider + ~20kg converted hardtail, moderate MTB tire rolling resistance (Crr 0.006), upright riding position (CdA 0.55). Wheel size and current-limit ceiling are read from the profile itself.

Choose two profiles to compare

Profile A

Profile B

Per-level output: power, current, top speed, climb speed

PAS level	Current A	Power W	Flat speed	Climb speed

Flat/climb speed capped by each level's Speed Limit % against an assumed ~45km/h reference ceiling — the firmware's exact speed-cap formula isn't publicly documented, so treat the cap as illustrative.

Launch response index (relative feel score, not measured seconds)

What changes going from A → B

06 · Wire log

Raw frame trace

Every byte sent/received, for debugging a stubborn connection or verifying nothing unexpected is being written.