Allied Vision Alvium 1800 U-040c, User Manual

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184 Alvium USB Cameras User Guide V3.3.0
Triggering
Exposure start delay = exposure area – exposure time.
Figure 78: Triggering rolling shutter (RS) cameras
No Conditions Results
1 Exposure time is shorter than readout time. Trigger 1 starts exposure 1 with a delay
2 Exposure time is shorter than readout time, but
longer than for exposure 1.
Trigger 2 starts exposure 2 with a delay shorter
than for exposure 1.
3 Exposure time is longer than readout time Trigger 3 starts exposure time without a delay.
Because the
exposure area is longer, also the
readout area is longer than for triggers 1 and 2
4 Exposure area is ongoing. Trigger 4 is ignored.
5 Readout area is ongoing Trigger 5 is ignored.
6 Readout area is finished. Exposure time is
longer than readout time.
Trigger 6 starts exposure 6 without a delay
Table 92: Triggering conditions and results
TriggerSelector values for rolling shutter (RS) cameras
Cameras with rolling shutter (RS) can be triggered using
AcquistionStart
,
AcquisitionEnd
, or
FrameStart
for
TriggerSelector
.
Cameras with rolling shutter (RS) cannot be triggered using
ExposureStart
or
ExposureEnd
for
TriggerSelector
.
Frame rates in triggered mode
When rolling shutter cameras are operated in triggered mode, the values for
maximum frame rate reached in free run mode are cut in half.
External signal
Sensor cycle state
1 2 3
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4 5 6
1
1
2
2
3
3
Readout area Exposure area
Delay
П Delay П
Idle Readout area Exposure area Readout area Exposure area
П Exposure start delay
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