Basic Operation and Features
Basler A500k Series 3-9
PRELIMINARY
3.3.1 ExSync, Edge-controlled Mode
When using the ExSync edge-controlled mode to control exposure, several guidelines must be
followed:
• ExSync must remain high for a minimum of 1 µs.
• ExSync must remain low for a minimum of 1 µs.
• The minimum ExSync 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 ExSync 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 rising ExSync
signal will be one of three cases, which are described in sections 3.3.1.1, 3.3.1.2 and 3.3.1.3.
3.3.1.1 ExSync, Edge-controlled Mode with Asynchronous Timing
Figure 3-8: ExSync, Edge-controlled Mode - Exposure Start and Stop with Frame Valid Low
If the exposure starts and stops when Frame Valid is low (see Table for values n to y):
• The actual start of exposure is x µs later than the rise of the ExSync signal.
• Actual length of exposure time
= n µs - y µs
Due to the propagation time of approximately 1 µs, ExSync can become high up to 1 µs before
frame valid becomes low.
A504k/kc A501k/kc
n exposure set by ExSync
x
3.3 µs 20.8 µs
y
≤ 3 µs ≤ 12.8 µs
Exposure
Frame
Valid
FlashOut
Line
Valid
ExSync
ExSync Period
20.8 µs (A501k/kc)
3.3 µs (A504k/kc)
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