USB Device Controller - HTML Only (One-Time COM)

Device Controls (Auto VID / PID)

Vendor ID (VID)

Detected automatically when USB is connected

Product ID (PID)

Detected automatically when USB is connected

Auto-connect on page load / USB plug (after first COM select)

Auto-reconnect on disconnect

Baud Rate: 9600 (fixed)

How it works First time: click Select COM Port once. After that VID/PID is saved and auto-connect works without popup.

JSON Editor

Edit JSON Command:

Communication Log

[00:00:00] System initialized. Open in Chrome/Edge. Select COM port once, then auto-connect.