Appendix
A
GigE Network Configuration
A-12
Getting Started with Visionscape GigE Cameras
Change
Base
to
Decimal
:
Now enter 8192 in the Value Data text box:
Click on OK and you are done for setting the packet size.
You’ve told Visionscape to use jumbo packets but the camera is still going
to be sending data at the same rate – as fast as possible.
Setting the Inter-Packet Delay
There is no reason to have a camera capable of sending data at 90
frames per second if your particular application only runs at 30 frames per
second. It makes a lot more sense (and puts a lot less stress on the PC)
to slow the camera down to the point where it is still fast enough to run
faster than the inspection requirements but not much faster. Let’s give the
application 10% headroom and say that for our 30 frames per second
application we feel safe with the camera running at 33 frames per second.
In other words, we need to slow down the camera to make sure that the
PC can handle the throughput. This is not an issue on PCs with dedicated
PCIe x16 graphics cards but it most certainly is on slower devices.
