Personal project. I used a logic analyzer and multimeter to identify the interface and decode its commands.
The challenge
The interface ground rose with the output voltage, reaching 30 V. That measurement overturned my original grounding assumption and changed the carrier design to wireless control without a wired host.
Results
- Identified the four-pin J9 interface: 9600 8N1, polled ASCII.
- Documented command pacing and differences between supply variants.
- Created an ESP32 carrier schematic, layout, and production files.
Current status: Interface investigated; full carrier-board bring-up is not documented here.