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Chapter 3 Advanced Programming with NI-IMAQ for IEEE 1394 Cameras
© National Instruments Corporation 3-7 NI-IMAQ for IEEE 1394 Cameras User Manual
Trigger Mode 4
With trigger mode 4, the camera starts frame integration when the external
trigger input changes to an active value. Multiple frames are exposed
before the camera transfers the image to the host computer. Each frame is
exposed for a duration specified by the shutter attribute. The number of
frames is specified by the optional parameter, which must have a value of
1 or more.
Figure 3-7. Timing Diagram for Trigger Mode 4
Trigger Mode 5
With trigger mode 5, the camera starts frame integration when the external
trigger input changes to an active value. Multiple frames are exposed
before the camera transfers the image to the host computer. Each frame is
exposed while the external trigger is active. The number of frames is
specified by the optional parameter, which must have a value of 1 or more.
Figure 3-8. Timing Diagram for Trigger Mode 5
Trigger
Exposure
Transmission
Frame N
Frame N + 1
Start Delay Start Delay
Start Delay Start Delay Start Delay
Frame
N
Frame
N
Frame
N + 1
Frame
N + 1
Start Delay
Trigger
Exposure
Transmission
Frame N Frame N + 1
Start Delay Start Delay
Frame
N
Frame
N
Frame
N + 1
Frame
N + 1
Start/Stop
Delay
Start/Stop
Delay