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D810a connection dropping mid sequence



hi there, I thought I would bounce this off the forum.

My D810a connects just as it should, but I am finding that it is also disconnecting and it shouldn't.

I ran a sequence of 25 frames, and came back to the camera later finding it was disconnected. 

Looking in the folder I only found 10 frames. 

For some reason, the camera disconnected from BYN. 

I have seen the behavior a few times now and it is a problem.

Any suggestions to troubleshoot?




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7 answers to this question

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26 minutes ago, malcol@outlook.com said:

I was connecting via unpowered hub to Intel Stick pc. 

The computer and camera do not power down or off so the first reply got me thinking. Definitely a low powered pc.

I purchased a powered hub to see if that helps.

Will let you know how it goes.


I don't think a powered hub will do anything here because the camera is not powered by the hub, it has it's own power source.

But, having to many devices connected to a hub pushing data into it will saturate the data capacity of the hub and the camera SDK will see this as a camera disconnect because it can't see the camera momentarily.  Even a drop of 1 millisecond will cause the camera to disconnect.  If anything, try with the camera connected into it's own computer USB port as a test and see what happens.

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On 2/17/2018 at 12:08 PM, admin said:

I don't think a powered hub will do anything here because the camera is not powered by the hub, it has it's own power source.

Don't count out the potential for Improvement due to a Powered Hub.  Using a Compute Stick as your Imaging PC, you know Hub isn't going to get much more Current than the USB Minimum Spec.  Depending on the Circuits within the Hub, that may NOT be enough to power everything that contributes to Full Functionality of that Hub.  Having an Explicit Power Port on the Hub ensures that it will have Sufficient Power regardless of the capabilities of the Master USB Port on the Compute Stick.  This may well cause better USB Hub Performance - and it definitely Won't Hurt.

My experiences with the USB3 Connection from my 7D mkII through an Unpowered USB3 Hub to my High-Spec Laptop highlighted this benefit for me when I moved to a Powered USB3 Hub.

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Disconnects are typically due to cabling issues or USB saturation.

1) Eliminate cabling by directly connecting the camera to your PC with a short cable that is known to be good. If this works as expected, extend the cable as necessary, but do not exceed standard USB lengths. Use an active USB extension cable if necessary.

2) Don't connect the camera through a USB hub, per Nikon's recommendations.

3) Some low-powered PC's, like inexpensive all-in-ones or netbooks, have internal USB hubs that are not up to handling the throughput of image downloading from multiple cameras (imaging camera and guide camera) simultaneously. First test with your final cabling solution but without any other devices connected. If adding auto-guiding to the mix causes BYN disconnects, then you might need to think about a more powerful computer.

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On 2/14/2018 at 1:08 PM, malcol@outlook.com said:

I wouldn't know if I didn't ask :) 

Ah, but it does not mean we can't try to find the root cause :)

Tell us a bit more about you connection.  Are you using a usb hub?  How long is your usb cable?  Is your camera set to shut down after x minute in inactivity?  Is your computer set to go to sleep after 30 minutes? 

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