National Instruments IEEE 1394 Uživatelský manuál stáhnout pdf (Strana 31)

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

NI-IMAQ for IEEE 1394 Cameras User Manual 3-6 ni.com

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 + 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 + 2

Internal Trigger Cycle

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 60 61

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