VC Camera Link series
Page 43 of 86
RA14-11A-010
8.5
Trigger Mode
Trigger mode of the camera is divided into Free-Run mode where image is synchronized to Internal Trigger
signal created inside the camera and External Sync mode where image is synchronized to the trigger signal
entered into the external port.
8.5.1
Free-Run Mode
In Free-Run mode, the period of internal trigger signal is determined by Transfer Time (1 Frame data
transmission time) and Exposure setting value, and image is obtained with this periodic signal. Frame Rate, the
period of internal signal, is determined with the following two conditions.
Case 1: Exposure Time < Frame Transfer Time
Frame Rate(FPS) = 1 / Frame Transfer Time (sec)
→
has a fixed value.
Case 2: Exposure Time > Frame Transfer Time
Frame Rate(FPS) = 1 / Exposure Time (sec)
→
varies depending on Exposure Time value.
Internal
Trigger
Exposure
Frame Transfer
Exposure
SettingTime
Transfer Time
Image N
Image N + 1
Image N-1
Image N
Image N-1
Figure 8.7 Exposure Time is shorter than Readout Time
Internal
Trigger
Exposure
Frame Transfer
Transfer Time
(Readout Time)
Exposure Setting Time
Image N
Image N + 1
Image N-1
Image N-1
Image N
Figure 8.8 Exposure Time is longer than Readout Time
Summary of Contents for vieworks LVC-25MC2-30
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