Spyder3 GigE Vision User Manual
03-032-20027-02 DALSA
36
5.5 Timing: Exposure and Synchronization
Image exposures are initiated by an event. The trigger event is either the camera's
programmable internal clock used in free running mode, an external input used for
synchronizing exposures to external triggers, or a programmed function call message by
the controlling computer. These triggering modes are described below.
Free running (trigger disabled): The camera free-running mode has a programmable
internal timer for frame rate and a programmable exposure period. Frame rate is 0.1 fps
to the maximum supported by the sensor. Exposures range from the sensor minimum to a
maximum also dependent on the current frame rate. This always uses Synchronous mode
where exposure is aligned to the sensor horizontal line timing.
External trigger: Exposures are controlled by an external trigger signal. External signals
are isolated by an opto-coupler input with a time programmable debounce circuit. The
following section provides information on external trigger timing.
Software trigger: An exposure trigger is sent as a control command via the network
connection. Software triggers can not be considered time accurate due to network latency
and sequential command jitter. But a software trigger is more responsive than calling a
single-frame acquisition (Snap command) since the latter must validate the acquisition
parameters and modify on-board buffer allocation if the buffer size has changed since the
last acquisition.
Timing
Table 7: Timing Parameter Table
Units
Min. Typ. Max. Notes
tLine_Period μs 27.78 1000 1K 1 Tap
14.71 1000 1K 2 Tap
54.1 1000 2K 1 Tap
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