Many thanks for responses.

I am running my ZWO ASI cameras on a Beaglebone Black (BBB). Besides a camera, I am running a Rigel Systems nStep focuser. When both devices are connected, I connect with a USB hub. However, the problem I am having persists when I connect just a camera directly to the BBB USB port. Namely that the ASI183MM fails to capture a full frame image and that the ASI290MM fails to capture a full frame image when the integration time is set less than 1 second.

I'm using just one camera, and using it for imaging. No ST4 in use. I have upgraded the USB cable that came with the cameras.

More details and the ZWO tech responses may be found on the ZWO forum:
   bbs.astronomy-imaging-camera.com/d/12623-asi-cameras-armv7/2

I don't seem to have an INDI driver panel. Perhaps I'm missing something?

Yes, I suspect this is all about the speed of the download as both cameras work fine with the BBB if I cut the ROI down to 256x256 (which, of course, is not something I would normally want to do...). That the SDK is not waiting long enough to call ASIGetExpStatus.

So back to the "change USB traffic" thing. It seems to be a phrase only ZWO uses and I am left wondering whether it refers to camera settings, Ekos settings, INDI settings, or OS settings.

Thanks for reading.

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