Balluff MATRIX VISION mvBlueNAOS, Technical Manual

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124
Figure 2: wxPropView - Setting acquisition of a number of images started by an external signal
A rising edge at line 4 will start the acquisition of 20 images.
1.18.1.2 Generating very long exposure times
1.18.1.2.1 Basics
At the moment the exposure time is limited to a maximum of 1 up to 20 seconds depending on certain internal
sensor register restrictions. So each device might report a different maximum exposure time.
Since
Firmware version 2.28.0
Firmware version 2.28 did contain a major overhaul here so updating to at least this version can result in a much
higher maximum exposure time. However, current sensor controllers can be configured to use even longer exposure
times if needed using one of the devices timers to create an external exposure signal that can be fed back into the
sensor. This use case will explain how this can be done.
This approach of setting up long exposure times requires the sensor of the camera to allow the configuration of an
external signal to define the length of the exposure time, so only devices offering the
ExposureMode Trigger
←
-
Width can be used for this setup.
Note
The maximum exposure time in microseconds that can be achieved in this configuration is the maximum
value offered by the timer used.
With
GenICam
(p. 113 ) compliant devices that support all the needed features the setup is roughly like this:
1. Select "Setting -
>
Base -
>
Camera -
>
GenICam -
>
Counter And Timer Control -
>
Timer Selector -
>
Timer
1" and .
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