Transport
The box enumerates as an ordinary USB-serial port carrying raw bytes. Open it at the fixed baud, send frames, and confirm the box with the handshake.
Serial link Baud and framing
Fixed 6,000,000 baud (6 Mbaud), no negotiation. Any other baud fails.
The box speaks framed binary from the first byte.
- No ASCII console.
- No
115200startup step. - No baud-switch frame.
- Baud is never saved on the box, so a bad setting can't lock a client out.
USB identity WCH CH343 bridge
A WCH CH343 does the USB-to-serial conversion. Match its VID and PID to find the box among other serial devices.
| Property | Value |
|---|---|
| VID | 0x1A86 |
| PID | 0x55D3 |
| Baud | 6,000,000 |
| Framing | 8N1 |
| Linux path | /dev/ttyACM* |
| Windows path | COMx |
8N1 is 8 data bits, no parity, 1 stop bit.