In Exsync Level-Controlled Mode - Basler A102K User Manual

Operation and Features
You can set the camera to operate in one of the ExSync controlled exposure modes using either
the camera configuration tool CCT+ (see Section 4.1 and the configuration tool's on-line help) or
binary commands (see Section 4.2).
With the CCT+, you use the Exposure Time Control Mode setting on the Exposure tree to set the
camera for ExSync level-controlled or ExSync programmable exposure time control mode. If you
select the programmable mode, you can also adjust the exposure time. When you enter an
exposure time, the CCT+ will automatically set the "Timer 1" parameter to the correct value.
With binary commands, you must use the Exposure Time Control Mode command to select
ExSync edge-controlled or ExSync programmable mode. If you choose the programmable mode,
you must also use the Timer 1 command to set the exposure time.
3.2.1.2 Recommendations for Controlling Exposure

in ExSync Level-Controlled Mode

When using the ExSync level-controlled mode to control exposure, several general guidelines
must be followed:
• The ExSync signal must toggle.
• The ExSync signal must remain high for at least 15 µs.
• The minimum exposure time is 15 µs.
This means that the ExSync signal must remain low for at least 15 µs.
• If the AOI and Vertical Binning features are not being used, the minimum ExSync signal
period is 67,500 µs.
• 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 in Section 3.8.2.1 on page 3-26.
• If the Vertical 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 in Section 3.8.2.2 on page 3-26.
• With very short exposures, use flash light to prevent smearing.
Assuming that these general guidelines are followed, the reaction of the camera to a falling
ExSync signal will be one of two cases:
• In case one (see Figure 3-4), the falling edge of ExSync occurs while the camera is transmit-
ting a previously captured frame, that is, when frame valid is high. This will occur when the
frame rate is high.
• In case two (see Figure 3-5), the falling edge of ExSync occurs after the previously captured
frame has been transmitted, that is, when frame valid is low. This will occur when the frame
rate is medium or low.
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BASLER A102