Experimental Physics and
Industrial Control System

Wayne Lewis via Tech-talk <[email protected]> · Thu, 7 Feb 2019 11:15:13 +0100

Hi Nilson,

On Thu, Feb 07, 2019 at 10:17:19AM +0100, Nilson Pereira via Tech-talk wrote:
> 
> I have 3 cameras (Point Grey GigE Blackfly) that I want to use
> simultaneously at a very low framerate (1fps) for BPM purposes.
> 
> Each camera has its own IOC and they run perfectly one at a time.
> However, when running simultaneously, always 2 cameras conflict with
> each other and not necessary the same two cameras. During conflict, the
> IOC shows an error about frame inconsistency on both affected cameras. I
> have a gigabit network port on both switch and server, and the port is
> far from saturation.
> 
> Does anyone have experience with GigE cameras and have seem this type of
> problem? Is this a protocol issue since it happens even with the
> original (Flycap2) software ?
> 
> I appreciate any shared experience with problems with GigE cameras that
> could give a hint on why this is happening.
> 
We have seen similar issues with Blackfly cameras. A few things we have
done to attempt to resolve it:

- put each camera on its own network port. We have a setup with two
cameras connected to a single host, where each camera network port is
configured as a different private network (e.g., 192.168.1.1/24 and
192.168.2.1/24). This helps segregate network traffic and avoid the
packet collisions and losses.

- ensure the camera and network port MTUs are set to 9000.

- if you have switch between the host and the cameras, check that it is
permitting Jumbo packets on the relevant ports.

- look at the FLIR knowledge base documents for configuring the network
receive and RX ring buffer sizes: http://www.ptgrey.com/KB/10016

After setting things up this way, we have two cameras running at 10 fps,
with only minimal 'Image consistency' errors.

Hope that helps.

Wayne

> Best,
> 
> Nilson
> 
> 
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-- 
  Wayne Lewis
  e: [email protected]
  w: http://ospreydcs.com
  p: +1 631 905 1964

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System