National Instruments IEEE 1394 Manual de usuario descargar pdf (Pagina 32)

Chapter 3 Advanced Programming with NI-IMAQ for IEEE 1394 Cameras

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 + 1

Frame

N + 1

Start Delay

Trigger

Exposure

Transmission

Frame N Frame N + 1

Start Delay Start Delay

Frame

N + 1

Frame

N + 1

Start/Stop

Delay

Start/Stop

Delay

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 60 61

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National Instruments IEEE 1394 Manual de usuario Pagina 32