National Instruments IEEE 1394 用户手册

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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

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