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Point Grey <strong>Blackfly</strong> Technical Reference<br />
7 Image Acquisition Control<br />
7.1.3 Trigger Mode 15 (“Multi-Shot Trigger Mode”)<br />
Trigger Mode 15 is a vendor-unique trigger mode that allows the user to fire a single hardware or software trigger and<br />
have the camera acquire and stream a predetermined number of images at the current frame rate.<br />
The number of images to be acquired is determined by the parameter specified with the trigger mode. This allows up<br />
to 255 images to be acquired from a single trigger. Setting the parameter to 0 results in an infinite number of images<br />
to be acquired, essentially allowing users to trigger the camera into a free-running mode.<br />
Once the trigger is fired, the camera will acquire N images with an exposure time equal to the value defined by the<br />
shutter, and stream the images to the host system at the current frame rate. Once this is complete, the camera can be<br />
triggered again to repeat the sequence.<br />
Any changes to the trigger control cause the current sequence to stop.<br />
During the capture of N images, the camera is still in an asynchronous trigger mode , rather than<br />
continuous (free-running) mode. The result of this is that the frame rate is turned OFF, and the camera<br />
put into extended shutter mode. Users should therefore ensure that the maximum shutter time is<br />
limited to 1/frame_rate to get the N images captured at the current frame rate.<br />
Related Knowledge Base Articles<br />
Title<br />
Article<br />
Extended shutter mode operation for DCAM-compliant PGR Imaging Products Knowledge Base Article 166<br />
Figure 7.2: Trigger Mode 15 (“Multi-Shot Trigger Mode”)<br />
GenICam—Acquisition Control<br />
Acquisition Mode<br />
MultiFrame<br />
Acquisition Frame Count Number of images to be acquired<br />
Trigger Selector<br />
Exposure Start<br />
Trigger Mode<br />
On<br />
Trigger Source<br />
Line x (GPIO pin)<br />
Trigger Activation<br />
Rising or Falling edge<br />
Trigger Delay 0<br />
Registers—TRIGGER_MODE 830h<br />
Presence [0] 1<br />
ON [6] 1<br />
Polarity [7] Low/High<br />
Source [8-10] GPIO Pin<br />
Value [11] Low/High<br />
Mode [12-15] Trigger_Mode_15<br />
Parameter [20-31]<br />
N number of images to be<br />
acquired<br />
Revised 12/13/2012<br />
Copyright ©2012 Point Grey Research Inc.<br />
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