ALLIED Vision Technologies Guppy F-503 - Manual (Page 167)

Controlling image capture
GUPPY Technical Manual V7.1.0
167
Controlling image capture
Global shutter (CCD cameras only)
Shutter modes The cameras support the SHUTTER_MODES specified in IIDC V1.3. For all
Guppy models (except Guppy F-036/503) this shutter is a global shutter;
meaning that all pixels are exposed to the light at the same moment and for
the same time span.
Continuous mode In continuous modes the shutter is opened shortly before the vertical reset
happens, thus acting in a frame-synchronous way.
External trigger Combined with an external trigger, it becomes asynchronous in the sense
that it occurs whenever the external trigger occurs. Individual images are
recorded when an external trigger impulse is present. This ensures that even
fast-moving objects can be grabbed with no image lag and with minimal
image blur.
Camera I/O The external trigger comes in as a TTL signal through Pin 4 of the camera
I/O connector.