Here's the log output for one particular event

[2021-09-27T16:21:57.419 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Starting exposure: 1000000 us @ 1280 x 960 "
[2021-09-27T16:21:58.560 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Event 0X04 "
[2021-09-27T16:21:58.586 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Image received. Width: 1280 Height: 960 flag: 0 timestamp: 0 "
[2021-09-27T16:21:58.604 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Uploading file. Ext: fits, Size: 3692160, sendImage? Yes, saveImage? No "
[2021-09-27T16:21:58.696 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] BLOB transfer took 0.0654968 seconds "
[2021-09-27T16:21:58.696 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Upload complete "
[2021-09-27T16:21:58.723 BST DEBG ][ org.kde.kstars.indi] - processBLOB() mode 2
[2021-09-27T16:21:58.817 BST DEBG ][ org.kde.kstars.ekos.guide] - Received guide frame.
[2021-09-27T16:21:58.817 BST DEBG ][ org.kde.kstars.ekos.guide] - Capturing frame...
[2021-09-27T16:21:58.890 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Starting exposure: 1000000 us @ 1280 x 960 "
[2021-09-27T16:22:29.510 BST INFO ][ org.kde.kstars.ekos.guide] - "Exposure timeout. Restarting exposure..."
[2021-09-27T16:22:29.562 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Starting exposure: 1000000 us @ 1280 x 960 "
[2021-09-27T16:22:30.691 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Event 0X04 "
[2021-09-27T16:22:30.710 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Image received. Width: 1280 Height: 960 flag: 0 timestamp: 0 "
[2021-09-27T16:22:30.725 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Uploading file. Ext: fits, Size: 3692160, sendImage? Yes, saveImage? No "
[2021-09-27T16:22:30.814 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] BLOB transfer took 0.0616993 seconds "
[2021-09-27T16:22:30.817 BST DEBG ][ org.kde.kstars.indi] - Altair ALTAIRGP224C : "[DEBUG] Upload complete "
[2021-09-27T16:22:30.853 BST DEBG ][ org.kde.kstars.indi] - processBLOB() mode 2
[2021-09-27T16:22:30.971 BST DEBG ][ org.kde.kstars.ekos.guide] - Received guide frame.
[2021-09-27T16:22:30.971 BST DEBG ][ org.kde.kstars.ekos.guide] - Capturing frame...

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This is the USB2 version of the 224C. It times-out randomly every few minutes when guiding in astroberry on the pi4 (even with speed=0 and 2x2 binning) - I understand these time-outs are a known issue with the altair driver. However, the real problem for guiding is that it waits 30 secs before timeing out, even with 1 sec exposures. It then starts taking images again. But this gap makes guiding almost impossible. So does anyone know where the time-out length is set, and whether it can be reduced? I can't see any good reason for waiting this long with such short exposures - the download time is negligible.

Nigel M

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