Hi,
when I change the CCD_FRAME settings of my QHY5-II cam with "unsupported" frame size settings (by accidentally choosing wrong subframe settings) , then the driver does not respond with some error messages but simply becomes unresponsive. I cant see a crash but the driver hangs in "GetQHYCCDSingleFrame".
For example frame size 32 pixel with 500 px offset in x-y is working, but the same settings with frame size 16 not. I am wondering how a client can determine which subframes are allowed and which not ...

Thanks,
Klaus

Blocking ================================
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] Final binned (1x1) image area is (500, 500), (16, 16)
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] Current exposure time is 100000.000000 us
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] SetQHYCCDBinMode (1x1).
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] SetQHYCCDResolution camroix 500 camroiy 500 camroiwidth 16 camroiheight 16
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] Taking a 0.1 seconds frame...
2018-06-17T11:38:47: QHY CCD QHY5II-M-1037db: [DEBUG] Exposure done, downloading image...
2018-06-17T11:38:47: QHY CCD QHY5II-M-1037db: [DEBUG] Blocking read call.

Not-Blocking ==========================================================================
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] Final binned (1x1) image area is (500, 500), (32, 32)
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] Current exposure time is 100000.000000 us
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] SetQHYCCDBinMode (1x1).
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] SetQHYCCDResolution camroix 500 camroiy 500 camroiwidth 32 camroiheight 32
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] Taking a 0.1 seconds frame...
2018-06-17T11:27:46: QHY CCD QHY5II-M-1037db: [DEBUG] Exposure done, downloading image...
2018-06-17T11:27:46: QHY CCD QHY5II-M-1037db: [DEBUG] Blocking read call.
2018-06-17T11:27:46: QHY CCD QHY5II-M-1037db: [DEBUG] Blocking read call finished.
2018-06-17T11:27:46: QHY CCD QHY5II-M-1037db: [DEBUG] Download complete.

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