regain documentation

CAA, EFW & EAF

SDK-free ZWO accessory drivers with native NINA, native ASCOM, and Alpaca setup.

All three accessories use the same Rust USB HID worker through each frontend. On Windows, the built-in HID driver is sufficient. Select a serial in setup and disconnect other controllers before connecting.

CAA rotator

Select PulsarFab regain CAA Rotator. Setup includes motion, Halt, logical sky-angle sync, reverse, beep, alias, travel limits, and setting the current mechanical position to zero. Alpaca uses Rotator device 0.

Normal positioning respects the firmware travel limit. Explicit multi-turn controls use reference resets, which bypass cumulative cable-wrap protection; inspect cable clearance before using them.

A CAA-M54 with firmware 1.1.1 passed Windows hardware tests, including a 450° forward-and-return move. Linux/macOS HID builds still need hardware testing.

CAA Alpaca setup connected to a simulated rotator. No physical rotator moved for this screenshot. Select the image for full resolution.

EFW filter wheel

Select PulsarFab regain EFW Filter Wheel. The Filters tab sets slot names, focus offsets, and unidirectional moves. Motion uses display slots 1–N. NINA retains its per-filter exposure and autofocus settings. Alpaca uses FilterWheel device 0.

Calibrate the wheel

Connect for setup and open Motion → Calibrate wheel, or choose Calibrate wheel in Alpaca.
Wait for live progress to finish. Calibration detects slots and ends at slot 1.
Verify slot selection. Filter names and focus offsets are preserved.

The attached seven-position EFW passed SDK and native calibration in about 49 seconds, followed by full slot sweeps.

Native EFW Motion tab with calibration controls. This is a render of the actual WPF controls using a simulated wheel. Select the image for full resolution.

EAF focuser

Select PulsarFab regain EAF Focuser. Motion provides absolute step moves and Halt. Settings control beep, reverse, hardware backlash, and maximum travel. Check mechanical clearance and use zero hardware backlash if NINA manages it. Temperature compensation remains the host application’s responsibility. Alpaca uses Focuser device 0.

Native EAF settings rendered from the real controls using a simulated focuser. Select the image for full resolution.

For commands, USB traces, tested behavior, and limitations, see the EFW/EAF playbook and CAA frontend guide.