40
DFW-SX900
DFW-X700
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.
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 DFW-SX900, and 15 fps for the DFW-X700.)
Camera
DFW-SX900 (7.5 fps)
DFW-X700 (15 fps)
A [ms]
Approx. 8
Approx. 2.4
B [ms]
Approx. 4.2
Approx. 0
COMMAND SETTING AND OPERATION TIMING
VD
Isochronous
Output of normal moving images
starts from here at the earliest
1 V
Approx. 50 ms
Set Trigger OFF in this period
Trigger Mode until now
NORM. from here
VD
Ext Trig.
Isochronous
Approx. 120 ms (DFW-SX900)
Approx. 64 ms (DFW-X700)
Exposure Time
External Trigger Signal
External Trigger Acceptance Prohibition Period
A
B
