ASCOM Driver issue preventing camera reconnection ?

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ASCOM Driver issue preventing camera reconnection ?

Post by mathieuclerte » Wed May 01, 2019 12:27 am


With a ZWO ASI174mm-cool used as guide camera, we were doing either focus or calibration (can't remember) and MaximDL came up with the following error message, which prevented us to take an exposure :

"Your exposure time is not between 0 and 0"

We disconnected from the camera, and could not reconnect.

The only solution was to reboot the PC, as restarting MaximDL was not enought even to reconnect to the camera (it did not want to connect).

I have addressed this issue with DiffractionLimited and they confirmed it is a driver issue. As MaximDL uses the ZWO ASCOM Driver, is there something we can do to identify where the problem comes from ?

Thanks in advance for your help,


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Re: ASCOM Driver issue preventing camera reconnection ?

Post by Support2@ZWO » Sun May 05, 2019 1:27 am

Hi Mathieu,
Please send an email to me: chad.cao(at)
I will help you enable the SDK's Log to check out what happened.
ZWO Driver Engineer
Location:lon=120.6 lat=31.3
SuZhou China

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