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JKBMSR v16
JKBMSR Tools/Gateway Firmware Studio

Web Serial Firmware Flasher

Install the latest cryptographically signed production firmware directly to your ESP32 over USB without external software.

Web Serial API Active
Loading supported gateway hardware and the latest signed firmware…

Need diagnostics after flashing? Open the live console below and click Restart device (or press the board's EN/RESET button) to replay the gateway's boot log.

Hardware Wiring & Pinout Guide

View Full Compatibility Matrix →
SCHEMATIC: ESP32 ↔ JK-BMS 4-PIN UARTISOLATION VERIFIED
ESP32-S3 / C3Hardware GatewayGPIO17 (TX)GPIO16 (RX)GNDTX → RXRX ← TXCOMMON ISOLATED GROUNDJK-BMS PORT4-Pin JST-XH (GPS/UART)BMS TX (Pin 2)BMS RX (Pin 3)GND (Pin 4)
Default Baud Rate: 115200 bps • Logic Level: 3.3V TTL (Do NOT connect directly to 48V/60V battery bus)
⚠️Isolation Warning

Ensure an isolated DC-DC converter (e.g. B0505S-1WR3) is placed between the BMS power supply and the ESP32 to eliminate ground loop voltage spikes. Never connect USB to a computer while main battery pack grounds are floating.

REQUIRED CONNECTIONS
  • GNDCommon Ground (Pin 4)
  • GPIO16UART RX2 ← BMS TX (Pin 2)
  • GPIO17UART TX2 → BMS RX (Pin 3)