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Synchronization Modes
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The synchronization mode determines the exact timing of the exposure. Synchronization can either be
performed internally or triggered by an external source, e.g. an encoder signal.
There are two different synchronization functions that can be applied together or individually:
1. Line synchronization:
The falling edge of a TTL signal at the LINE SYNC A input triggers each individual exposure of the sensor line
by line.
The SK12240U3KOC-LB line scan camera enables extended synchronization control by means of a second
trigger input LINE SYNC B. A detailed description can be found .under Advanced Synchronization Control, S.
24.
2. Frame synchronization:
The recording of a set of lines (frame) representing a two-dimensional image is started by the falling edge of a
TTL signal at the FRAME SYNC input.
Free Run / SK Mode 0
The acquisition of each line is synchronized internally (free-running) and the next scan is started automatically
after completion of the previous line scan. The line frequency is determined by the programmed value.
LineStart / SK Mode 1
After an external trigger pulse, the currently exposed line is read out at the next internal line clock. The start and
duration of the exposure are controlled internally by the camera and are not affected by the trigger pulse. The
exposure time is programmable. The line frequency is determined by the frequency of the trigger signal.
Limitations: The period of the trigger signal must be longer than the exposure time used. Between the external
trigger signal and the internally generated line clock, jitter occurs in the range of the exposure time.
ExposureStart / SK Mode 4 (only available when camera supports integration control)
A new exposure is started exactly at the point in time of the external trigger pulse. The exposure time is deter-
mined by the programmed value. The exposed line is read out after the exposure time has elapsed. The frequency
of the trigger signal determines the line frequency.
Restriction: The period duration of the trigger signal must be longer than the exposure time used.
ExposureActive / SK extSOS (Mode 5)
The exposure time and the line frequency are controlled by the external trigger signal. This affects both the start of
a new exposure (Start of Scan-Pulse, SOS) and the readout of the previously exposed line.
FrameTrigger / SK FrameSync
The camera suppresses the data transfer until a falling
edge of a TTL signal occurs at the FRAME SYNC
input. This starts the acquisition of a 2D area scan.
The number of image lines must be programmed in
advance. Any of the available line synchronization
modes can be used for the individual line scans.
Instruction Manual SK12240U3KOC-LB
© 2020-03 E
FRAME SYNC
LINE SYNC
Video
Video Valid
Data transmission
Combined frame and line synchronization
Synchronization
19
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