National Instruments Image Acqusition Software NI-IMAQdx Manual De Usuario

© National Instruments Corporation

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

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