Basler Vision Technologies A202k, User Manual

Page: 37 / 118

Operation and Features
BASLER A202
k
3-7
DRAFT
3.2.1.3 Recommendations for Controlling Exposure
in ExSync Programmable Mode
When using the ExSync programmable mode to control exposure, several general guidelines
must be followed:
• The ExSync signal must toggle.
• The ExSync signal must remain high for at least 4 µs.
• The minimum setting for Timer 1 is 13 µs.
• The programmed exposure time must be less than the ExSync signal period.
• If the AOI and Binning features are not being used, the minimum ExSync signal period is
20.83 ms.
• 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
3-27 .
• If the binning 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
3-31 .
• With very short exposures, use flash light to prevent smearing.
Assuming that these general guidelines are followed, the reaction of the camera to a rising ExSync
signal will be one of two cases. In case one (see Figure
3-6 ), the rising edge of ExSync occurs
while the camera is transmitting a previously captured frame, that is, when frame valid is high. In
case two (see Figure
3-7 ), the rising edge of ExSync occurs after the previously captured frame
has been transmitted, that is, when frame valid is low.