Basler A504k - Free-Run Mode; Free-Run Mode with Asynchronous Timing

Basic Operation and Features
Basler A500k Series 3-21
PRELIMINARY
3.3.4 Free-run Mode
When using the freerun, programmable mode to control exposure, several guidelines must be
followed:
• The internal control signal must remain high for a minimum of 3 µs.
• The internal control signal must remain low for a minimum of 10 µs.
• The minimum internal sync signal period is 2 ms with the full AOI for the
A504k/kc, and 13.52
ms for the
A501k/kc.
• If the AOI feature is being used, the minimum internal sync signal period is equal to
1/Maximum Frame Rate where the maximum frame rate is determined by the
formula on page 35.
Assuming that these general guidelines are followed, the reaction of the camera to a falling
ExSync signal will be one of four cases, which are described in sections 3.3.4.1, 3.3.4.2, 3.3.4.3
and 3.3.4.4.
3.3.4.1 Free-run Mode with Asynchronous Timing
Figure 3-19: Free-run, Programmable Mode - Exposure Start and Stop with Frame Valid Low
If the exposure starts and ends while Frame Valid is low:
• Actual length of exposure time = n µs (n = exposure set by Timer 1)
*
The FlashOut signal can be set into a mode where it is high while the actual expo-
sure is active. This FlashOut mode is shown in the timing diagrams.
Exposure Time
(Timer 1)
Frame
Valid
FlashOut
Line
Valid
Internal
Control
Signal
Internal Control Signal Period
Timer 2
1.9 µs (A504k/kc)
3 µs (A504k/kc)
20.1 µs (A501k/kc)
7 µs (A501k/kc)