User`s guide

GigE Vision Hardware

16-27

For more information on this, see Step 3 in “Installation of GigE Vision Cameras and

Drivers on Windows” on page 10-4.

Make sure the Ethernet card is configured properly.

For more information on this, see “Network Hardware Configuration Notes” on page

10-3 and “Network Adaptor Configuration Notes” on page 10-4.

Also, if you have multiple cameras connected to multiple Ethernet cards, you cannot

have them all set to automatic IP configuration. You must specify the IP address for

each card and each card must be on a different subnet.

Test the connectivity of your device separate from using the Image Acquisition

Toolbox. Use the vendor program included with your device to see if you can detect

and acquire images from the camera.

If you receive an error message such as:

“Block 23 is being dropped because packets are unavailable for resend.”

and it does not mention buffer size, it is likely that packets are being dropped due

to overload of the CPU. To lower the CPU load, raise the value of the PacketSize

device-specific (source) property. In order to do this, you must be using hardware

that supports jumbo frames.

You might also want to calculate and set the PacketDelay device-specific (source)

property.

Also, if you are using a CPU that is older than an Intel

Core™ 2 Quad or equivalent

AMD

, you may experience this type of error.

If you have a slower computer and experience packet loss using the GigE Vision

adaptor, you can set a packet delay to avoid overloading the computer. This

is useful in solving the performance issue if you cannot achieve your camera’s

frame rate. The PacketDelay property will initially be set to use the value that

is your camera’s default value. You can then adjust the value if needed. The

TimeStampTickFrequency property is read-only but is available for calculating the

actual packet delay value is being used.

For more information on the new PacketDelay property and how to calculate

packet delay, see this solution: