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Chapter 5 Gate Mode Operation 85
• Image Shift {Shifting Under Mask}
Driven high (logic 1) as a detected image is shifted under the mask.
Specific signal timing is CCD-dependent as follows:
— Interline CCD
Driven high (logic 1) as the entire image is shifted under the CCD mask.
— Full-Frame CCD
Momentarily pulsed high (logic 1) as each line of the image is shifted.
— Frame Transfer CCD
Driven high (logic 1) for the duration of the image-area to storage-area transfer.
• Logic 1 {Always High}
The level at the connector is high.
• Read Out {Reading Out}
It is at a logic high when CCD is being read; otherwise low.
• Shutter {Shutter Open}
This level is at a logic high when the photocathode is gated on (signal is
accumulating on the CCD) and can be used to drive an external electro-mechanical
shutter. Contact the factory for more information.
• Wait for Trigger {Waiting For Trigger}
This level is at a logic high when the camera is ready to acquire and is waiting for
an external trigger (through the EXT SYNC connector) before exposing the CCD.
The level goes low when a trigger is detected: exposure begins. The Wait for
Trigger (WFT) signal goes high immediately after readout or after pre-open (if it is
active.) If continuous cleans is enabled, the camera will check for a trigger at the
EXT SYNC connector before entering a continuous clean cycle. If none has
occurred, a cleaning cycle is initiated and completed. Before the next cycle begins,
the EXT SYNC connector is checked again, and exposure will start if a trigger has
occurred.
When the
Invert LOGIC {Invert Output Signal} check box is checked, the output is at a
logic low when an action is occurring.