![](/images/new-backgrounds/1178704/17870483x1.webp)
COMMAND SETTING AND OPERATION TIMING ![](/images/new-backgrounds/1178704/17870483xi2.webp)
As shown in the following figure, it takes at least about 50 ms for external trigger signals to be not received after the Trigger OFF command has been set to the CSR (F0F00830h) of the camera.
When low frame rate at which the transmission of one image takes a long time is selected, isochronous transmission may not have completed when Trigger OFF is executed. In this case, output of normal moving images will start after transmission completes.
Set Trigger OFF in this period
VD
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| Approx. 50 ms | ||
Trigger Mode until now | NORM. from here | |||||
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Isochronous
Output of normal moving images starts from here at the earliest
Timing between external trigger signal and video signal output
When the Trigger Mode (CSR F0F00830h) is set to ON, the camera will start exposure as shown in the following figure when it detects the external trigger signal.
After the exposure time set by the Shutter command (CSR F0F0081Ch), VD pulses will be generated inside the camera. Images will be isochronously output after the A period from the falling edge of the VD.
(The following figure shows an example where the frame rate is 7.5 fps for the
VD
External Trigger Signal
Ext Trig.
Isochronous
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| Exposure Time |
| A |
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| Approx. 120 ms | ||
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| Approx. 64 ms | ||||
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External Trigger Acceptance Prohibition Period | B |
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Camera | A [ms] | B [ms] | |
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(7.5 fps) | Approx. 8 | Approx. 4.2 | |
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(15 fps) | Approx. 2.4 | Approx. 0 | |
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