GC-Series auto-iris connection
Prosilica's GC-series cameras provide built-in auto iris controls for controlling video-type auto-iris lenses. The auto-iris signal is available on the GC's 12-pin hirose connector located on the back panel of the camera. Here is a PDF circuit diagram that illustrates how to connect a video-type auto-iris lens to the GC-series camera:
Note: The auto-iris function is currently available on the GC-series cameras only (not GE).
Video Auto-Iris operation:
“Video Signal”, as listed in GC Iris Circuit pdf, does not contain actual digital image data. It is a DC control signal for the lens, varying between 0 (depending on IrisVideoLevelMin) and 750mV (depending on IrisVideoLevelMax).
Every video auto-iris lens has a fixed reference voltage (e.g. 85mV). When the Video Signal coming from the camera is above that value, the iris will close. When it’s below that value, the iris will open.
When IrisMode is set to Video (full auto) the camera calculates the mean image saturation of the current image. If it is below/above the IrisAutoTarget the camera will provide a Video Signal below/above the lens reference voltage. When IrisAutoTarget saturation is achieved, the camera will output a Video Signal equal to the lens reference voltage.
> Click here for more information about specific Iris controls <