Basler raL2048-48gm User Manual Page 147

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AW00118302000 Acquisition Control
Basler racer GigE 137
Once you have determined which factor is most restrictive on the line rate, you can try to make that
factor less restrictive if possible:
If you find that the sensor readout time is most restrictive factor, you cannot make any
adjustments that will result in a higher maximum line rate.
If you are using long exposure times, it is quite possible to find that your exposure time is the
most restrictive factor on the line rate. In this case, you should lower your exposure time. (You
may need to compensate for a lower exposure time by using a brighter light source or
increasing the opening of your lens aperture.) You can extend the exposure time to some
degree after having removed the parameter limits from the Exposure Overhead parameter (for
more information, see Section 8.5.1).
The frame transmission time will not normally be a restricting factor. But if you are using
multiple cameras and you have set a small packet size or a large inter-packet delay, you may
find that the transmission time is restricting the maximum allowed line rate. In this case, you
could increase the packet size or decrease the inter-packet delay. If you are using several
cameras connected to the host PC via a network switch, you could also use a multiport
network adapter in the PC instead of a switch. This would allow you to increase the Ethernet
bandwidth assigned to the camera and thus decrease the transmission time.
For more information on the settings that determine the bandwidth assigned to the camera, see
Section 5.2 on page 39.
Example
Assume that you are using an raL2048-48gm camera set for an exposure time of 190 µs and a
frame height of 500 lines. Also assume that you use the default value for C
1
, that you have checked
the value of the Device Current Throughput parameter and the Payload Size parameters and found
them to be 110000000 and 5120000 respectively.
Factor 1 (sensor readout):
Max Lines/s = 80000
Factor 2 (exposure time):
Max Lines/s = 5117 Lines/s
Factor 3 (frame transmission time):
Max Lines/s = 10742
Max Lines/s
1
190 µs 5.4 µs+
-----------------------------------------=
Max Lines/s
110000000
5120000
------------------------------


500=
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