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4M30 Camera User’s Manual 26
DALSA 03-32-10030-03
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Example: Enable No Clean Mode
Command Value
Binary 1000 0010 1*** *1**
Hex 82h **h
Note: The register containing the No Clean bit also controls other configuration data (*).
All bits must be set appropriately.
3.13 Triggering, Integration, and Frame Rate
Overview
Image capture triggering, integration, and frame rate are closely related.
• Integration time can be less than 1/frame rate, but it can never be greater than
1/frame rate.
• You can program fixed integration (or use default) and let the camera “free run.”
• You can program fixed integration time and supply a (asynchronous) trigger signal
to control frame rate by supplying a TTL pulse on the SMA connector. This is
referred to as “Programmed Integration/External Trigger Mode.”
• You can also have the camera integrate as long as an asynchronous TTL pulse is held
high. This pulse will therefore control both integration time and frame rate. This is
also known as “External Integrate Mode.”
For a given frame rate, the maximum integration time is limited to the frame period less
an overhead factor required for proper operation of the CCD. Maximum integration time
is defined by this equation:
Max Integration Time = (1/Frame Rate) – 32.35 ms
This equation is valid for all modes, free running, external trigger and external integrate
modes.
WARNING: Do not set integration time higher than the limits of the equation above.
Unpredictable operation may result
3.14 Controlling Integration (Shutter Time)
The 4M30 allows you to control integration (also known as exposure time or shutter time)
in these ways.
• Programmed Integration/Free Running: (default) The camera free runs with the
internally programmed integration time and frame rate
• Programmed Integration/SMA Trigger: The camera will integrate for the internally
programmed time when triggered by a high going TTL pulse on the SMA connector.
• Programmed Integration/Serial trigger: The camera will integrate for the internally
programmed time when triggered by a high going Serial Trigger signal.
• External Integration/SMA Trigger: The camera will integrate as long as the TTL
pulse on the TRIGGER IN SMA connector is high. The integration time is effectively
the input pulse width. In this mode, TRIGGER IN also controls the frame rate.