78 PI-MAX/PI-MAX2 System Manual Version 5.F
the array is minimized during the time between the receipt of the Start
Acquisition command and the arrival of the Ext Sync.
Internal Sync (PTG)
Clean cycles function as previously described. However, the Continuous Cleans function is
disabled.
Figure 30. Timing Diagram: Internal Sync (PTG)
Figure 31. Timing Diagram: Internal Sync with an External Trigger
External Triggering
When an External Sync timing mode is selected, the ST-133 waits for the Start
Acquisition command from the computer and a TTL level change (negative- or positive-
edge as set on the Experiment Setup|Timing tab page) to occur at the Ext Sync BNC
before starting the exposure time. The camera will begin the data acquisition cycle as
soon as the current clean cycle ends. The data acquisition cycle includes the exposure
time, shutter compensation time (unless Shutter Type is None), and the readout time.
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