Image Acquisition Control
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7.11.4 Trigger Ready Signal (scA750-60 Only)
As described in an earlier section, on these cameras the exposure for an image acquisition must
not begin until readout of the previously acquired image has ended. The camera supplies a “Trigger
Ready” (TrigRdy) output signal you can use to ensure that these conditions are met when you are
using a hardware trigger signal to trigger image acquisition. The trigger ready signal relates to
different trigger signals, depending on the image acquisition control mode:
In standard mode, the trigger ready signal relates to the frame start tigger signal.
In legacy mode, the trigger ready signal relates to the acquisition start tigger signal.
When you are acquiring images, the camera automatically calculates the earliest moment that it is
safe to trigger each new acquisition. The trigger ready signal will go high when it is safe to trigger
an acquisition, will go low when the acquisition has started, and will go high again when it is safe to
trigger the next acquisition (see Figure 61). The camera calculates the rise of the trigger ready
signal based on the current exposure time parameter setting, the current size of the area of interest,
and the time it will take to readout the captured pixel values from the sensor.
The trigger ready signal is especially useful if you want to run the camera at the maximum
acquisition frame capture rate for the current conditions. If you monitor the trigger ready signal and
you begin acquisition of each new image immediately after the signal goes high, you will be sure
that the camera is operating at the maximum acquisition frame rate for the current conditions.
Fig. 62: Trigger Ready Signal
The information in this section only applies to scA750-60 fm/fc cameras. For
information about the other camera models, see Section 7.11.3 on page 132.
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