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Network Related Camera Parameters and Managing Bandwidth
Tip
The manufacturer's documentation sometimes makes it difficult to determine
the maximum packet size for a device, especially network switches. There is
a "quick and dirty" way to check the maximum packet size for your network
with its current configuration:
1. Open the pylon Viewer, select a camera, and set the Packet Size param-
2. Use the Continuous Shot mode to capture several images.
3. Gradually increase the value of the Packet Size parameter and capture a
4. When your Packet Size setting exceeds the packet size that the network
Step 2 - Set the Bandwidth Reserve parameter for each camera.
The Bandwidth Reserve parameter setting for a camera determines how much of the bandwidth
assigned to that camera will be reserved for lost packet resends and for asynchronous traffic such
as commands sent to the camera. If you are operating the camera in a relatively EMI free
environment, you may find that a bandwidth reserve of 2% or 3% is adequate. If you are operating
in an extremely noisy environment, you may find that a reserve of 8% or 10% is more appropriate.
Step 3 - Calculate the "data bandwidth needed" by each camera.
The objective of this step is to determine how much bandwidth (in Byte/s) each camera needs to
transmit the image data that it generates. The amount of data bandwidth a camera needs is the
product of several factors: the amount of data included in each image, the amount of chunk data
being added to each image, the "packet overhead" such as packet leaders and trailers, and the
number of frames the camera is acquiring each second.
For each camera, you can use the two formulas below to calculate the data bandwidth needed. To
use the formulas, you will need to know the current value of the Payload Size parameter and the
Packet Size parameter for each camera. You will also need to know the frame rate (in frames/s) at
which each camera will operate.
Payload Size
Bytes/Frame
=
---------------------------------- -
Packet Size
Data Bandwidth Needed = Bytes/Frame x Frames/s
94
eter to a low value (1 kB for example).
few images after each size change.
can handle, the viewer will lose the ability to capture images. (When you
use Continuous Shot, the viewer's status bar will indicate that it is
acquiring images, but the image in the viewing area will appear to be
frozen.)
1
×
Packet Overhead
4
+
Payload Size
+
Leader Size
+
Trailer Size
Basler pioneer
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