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Chapter 3 Advanced Programming with NI-IMAQdx
© National Instruments Corporation 3-9 NI-IMAQdx User Manual
Trigger Mode 2
With trigger mode 2, the camera starts frame integration when the external
trigger input changes to an active value. The same frame is exposed for
multiple triggers. The number of triggers is specified by the optional
parameter, which must have a value of 2 or more.
Figure 3-5. Timing Diagram for Trigger Mode 2
Trigger Mode 3
With trigger mode 3, the camera triggers continuously internally. The
frame is exposed for a duration specified by the shutter attribute before the
camera transfers the image to the host computer. The next internal trigger
becomes active after a set cycle time. The cycle time is N times the cycle
time of the fastest frame rate. N is specified by the optional parameter,
which must have a value of 1 or more.
Figure 3-6. Timing Diagram for Trigger Mode 3
Trigger
Exposure
Transmission
Frame N Frame N + 1 Frame N + 2
Start Delay Start Delay Start Delay
Start/Stop
Delay
Start/Stop
Delay
Start/Stop
Delay
Frame
N + 1
Frame
N
Frame
N + 2
Trigger
Exposure
Transmission
Frame N Frame N + 1 Frame N + 2
Start Delay Start Delay Start Delay
Start Delay
Internal Trigger Cycle Internal Trigger Cycle
Start Delay Start Delay
Frame
N + 1
Frame
N
Frame
N + 2
Internal Trigger Cycle