ASI 1600MC Pro constantly disconnecting

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ASI 1600MC Pro constantly disconnecting

Post by jamiek » Sat Jun 01, 2019 5:44 pm

I have had my ASI 1600MC Pro for about a year now, it has performed flawlessly until recently.

While running an imaging session w/ SGP, the 1600 connectivity seems to drop - I hear the USB device unplug notification. SGP still shows the camera connected, but the sub in process never downloads and the sequence basically can't continue. I find that I can abort the sequence, disconnect the camera in SGP, reconnect it, and then resume the sequence. last night this seemed to happen randomly about a dozen times over the coarse of the evening. When this happens, all other devices (all coming in through the same hub) remain connected and functional so it seems to be something specifically with the 1600. Any thoughts on how to diagnose or correct this???

Additional details on my setup:
Win 10 Pro.
Latest ZWO drivers installed.
I'm using SGP, with the ZWO native drivers.
ASI 120mm guide cam connected via the 1600's hub.
The 1600 is connected via a powered USB 3.0 hub to my laptop along with my mount, focus controller etc.
Ambient temp can be somewhat hot ~ 80F
Cooler is running at -15C
I have tried multiple USB cables, bypassing the USB hub.

Dave Manning
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Joined: Mon Jun 03, 2019 8:07 am

Re: ASI 1600MC Pro constantly disconnecting

Post by Dave Manning » Tue Jun 04, 2019 8:09 am

HI folks.

I am also having this problem with my ASI071MC Pro Cooled camera with Celestron CGX mount and it started about 3 months ago .... or so....
I was originally using the one laptop computer for both PHD2 & SharpCap Pro until this problem started.

Error messages were “ASCOM driver failed checking IsPulseGuiding…..” and "RPC Server is unavailable (Exception from HRESULT: 0x800706BA)"

Also, it occurred RANDOMLY!!!!!!!

Some sessions it would happen after only 5minutes, other sessions after an hour or so. On one night it didn't happen at all and I got over 4 hours of uninterrupted guiding and imaging.........


Basically, and from my own very amateur testing (using different cables, short cables, different ports, etc, etc.) I have deduced that the problem is that PHD2 doesn't like running through a USB3 port i.e. "Prolific USB-to-Serial Comm Port......".

Exactly WHY the problem surfaced is anyone's guess, but it looks like it may have been an earlier Windows update which has changed something to do with how data is fed through USB3 ports.................................

Like I said, I'm no expert .... ;)

What I'm doing now is using a seperate, older laptop for running PHD2 as it only has USB2 ports.

SharpCap Pro and imaging is running on the newer laptop, which has only USB3 ports.

It's only a minor discomfort having to use a larger table but it works .................... so far ... ;)

PHD2 authors have been of magnificent assistance to me while testing.

I would be very interested in other's experiences with this same problem.

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Re: ASI 1600MC Pro constantly disconnecting

Post by Support@ZWO » Mon Jun 10, 2019 10:36 am

Looks like error message means the guiding system have something wrong. if not run PHD2, no guiding, does the SGP can works without any problems?
If yes, I think the 1600 is not the problem, need to check guiding system: guide camera, software, cable.
Location:lon=120.6 lat=31.3
Suzhou China

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