Dalsa Genie HM640, User Manual

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48
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Operational Reference Genie HM-HC Series-GigE Vision Camera
External Trigger Programmable Exposure
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Also known as “Edge Pre-select” exposure. See the timing diagram below.

The external trigger edge initiates the exposure process. The active external trigger edge can be selected as
either the low-high or high-low transition.
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The delay from active trigger edge to start of exposure is programmable from 100 μ s to 4 seconds (1 μ s steps) .
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Supports " Synchronous Mode " on page 51 timing for fastest possible frame rates. Start of exposure is aligned
on the next horizontal line while exposure duration granularity is 1µs. Exposure and sensor readout can be
concurrent.

Supports " Reset Mode " on page 52 timing. Exposure granularity is 1µs. Exposure and sensor readout must be
sequential, limiting the maximal frame rate.

Exposure duration is programmable from 10 μ s in Reset Mode or 56µs in Synchronous Mode, to 4 seconds
(with 1 μ s steps).

Any external trigger received before the previous exposure is complete is ignored. An application can elect to
receive messages about ignored triggers. See
" Events " on page 71 .
Programmable Synchronous Mode Exposure Timing