JBC Link (CP210x USB ↔ Arduino) – P02/P01 Auto

Passive USB bridge for JBC soldering and hot air stations (CP210x, P01/P02 auto-detect, Conti-Mode relay + LED).

The bridge transparently monitors the station communication, automatically detects the protocol (P01 or P02) and exposes the data via console and UART.

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Legal Notice

This project re-implements only functional protocol behavior (P02) and (P01) for interoperability purposes.
It contains no OEM firmware, no cryptographic keys, and does not circumvent any technical protection measures.
Protocol constants, enums, and IDs are interface identifiers required for device communication.
“JBC” is a trademark of its respective owners; this is an unofficial, independent project not affiliated with JBC S.A.

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Wiring Diagram

_{SVG version available at jbc_link_wiring.svg.}

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Features

• Strictly passive: no TX before the first valid frame/handshake
• Automatic protocol detection (P01/P02)
• Conti-Mode: detects continuous extraction mode and drives relay (D7) + SK6812 LEDs (D6)
• Keep-Alive & watchdog for stable link
• Hotplug detection for USB attach/detach events
• Dual console: simultaneous output via USB Serial and Serial1
• Supports soldering stations (e.g. DDE) and hot air stations (e.g. JTSE)
• CLI for status, logs and debugging

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Purpose

• Integration & Automation
  • Forward station data to external systems such as ESPHome or Home Assistant
• Conti-Mode outputs
  • Relay (D7) to directly control a fume extractor or filter
  • SK6812 LEDs (D6) for visual status indication
• Debugging & Analysis
  • Cleartext decoder and log output of all station communication

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CLI

The bridge provides a command line interface for status queries, log toggling and debug options.

Examples

HELP                 # Show all available commands
STATE                # Show current link/protocol state
LOG ON | LOG OFF     # Enable/disable protocol logging
HEX ON | HEX OFF     # Enable/disable hex frame dump
SYN ON | SYN OFF     # Show/hide keep-alive frames
FID ON | FID OFF     # Show/hide frame IDs in logs
CONTISEND ON | OFF   # Show/hide Contisend frames in logs
USBCLI ON | OFF      # Allow/deny TX from USB console
USBAUTO ON | USBAUTO OFF  # Automatic set M_USB_CONNECTSTATUS :C by default for Controlmode Write Commands

Example JBC Commands
M_INF_PORT 0
M_R_DEVICEIDORIGINAL
M_R_SLEEPTEMP 0 2
M_R_FIRMWARE
M_R_STATERROR
All JBC Commands find in jbc_console_map.h