Image Acquisition Control AW00123409000
148 Basler ace USB 3.0
Using the Exposure Active and Flash Window Output Signals
The acA1920-25 and acA2500-14 cameras can provide an exposure active output signal that goes
high when the exposure time for line one begins and goes low when the exposure time for line one
ends.
The exposure active signal is not available for acA3800-14 and acA4600-10 cameras. However, the
flash window signal is available and may in some cases serve as an alternative (see Section 6.8.2
on page 163)
If the camera is operating in rolling mode and you are using the camera to capture images of moving
objects, the use of flash lighting is most strongly recommended. The camera supplies a flash
window output signal to facilitate the use of flash lighting.
For more information about the exposure active output signal, see Section 6.8.1 on page 161.
For more information about the ExposureTime parameter, see Section 6.5 on page 139.
For more information about the flash window, see Section 6.6.2.3 on page 151.
6.6.2.2 Global Reset Release Mode
The global reset release mode is a variant of the rolling mode.
When the shutter is operating in global reset release mode, all of the lines in the sensor reset and
begin exposing when frame start is triggered (see Figure 63). However, in the end of exposure,
there is a temporal offset (designated as tRow) from one line to the next. The tRow values are the
same as for the rolling mode (see Table 35 on page 145).
The pixel values for each line are read out at the end of exposure time for the line. The readout time
for each line is also equal to tRow.
The exposure time for line one is determined by the ExposureTime parameter setting. The
exposure for line two will end tRow after the exposure ends for line one. The exposure for line three
will end tRow after the exposure ends for line two. And so on until the bottom line of pixels is
reached.
The Sensor Readout Time is the sum of the readout times of all lines. The Total Readout Time
equals the Sensor Readout Time plus the Exposure Overhead time C
1
.
In rolling mode, the flash window signal is not available when the exposure time
for the first row elapses before exposure for the last row of the current ROI has
started, i.e., more specifically, when Exposure Time ≤ Reset Runtime.
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