Camera Control and Performing a Scan
21
Instruction Manual
SK6288VKOC-4L
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Instruction Manual SK6288VKOC-4L © 2018-04 E
Camera Contr
ol and Performing a Scan
Free Run / SK Mode 0
The acquisition of each line is internally synchronized (free-running) and the next scan is started automatically on
completion of the previous line scan. The line frequency is determined by the programmed value.
LineStart / SK Mode 1
On an external trigger, the currently exposed line will be read out at the next internal line clock. The start and
duration of exposure are controlled internally by the camera and are not affected by the trigger. The exposure
time is programmable and the trigger does not affect the integration time. The line frequency is determined by the
trigger clock frequency.
Restriction: The period of the trigger signal must be longer than the exposure time used.
ExposureStart / SK Mode 4 (only available when camera supports integration control)
A new exposure is started exactly at the time of external triggering and the current exposure process will be
interrupted. The exposure time is determined by the programmed value. The exposed line will be read out with the
next external trigger. The trigger clock frequency determines the line frequency.
Restriction: The period 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 reading out of the previously exposed line.
FrameTrigger / SK FrameSync
The frame trigger synchronizes the acquisition of a 2D
area scan. The individual line scans in this area scan
can be synchronized in any of the available line trigger
modes. The camera suppresses the data transfer until a
falling edge of a TTL signal occurs at the FRAME SYNC
input. The number of lines that defines the size of the
frame must be programmed in advance.
FRAME SYNC
LINE SYNC
Video
Video Valid
Data transmission
Combined frame and line synchronization
The synchronization mode determines the timing of the line scan. Synchronization can be either performed inter-
nally or triggered by an external source, e.g. an encoder signal.
The line scan camera can be externally triggered in two different ways:
1.
Line-triggered synchronization:
Each single line scan is triggered by the falling edge of a TTL signal supplied to LINE SYNC A input.
The
SK6288VKOC-4L line scan camera facilitates advanced synchronization control by a second trigger
input LINE SYNC B. For a detailed description, see
Advanced Synchronization Control, p. 28
2.
Frame-triggered synchronization:
A set of lines resulting in a 2-dimensional frame or image is triggered by the falling edge of a TTL signal
on FRAME SYNC input.
Synchronization Modes
Schäfter + Kirchhoff
differentiates several trigger
modes identified by a number, which can be
selected in the control dialog as appropriate.
• Open the 'Camera Control' dialog [F4] to
configure the synchronization. The trigger mode
settings are available in the middle frame.
• Frame- and line-triggered synchronization can
be combined. Tick the 'Frame Sync' box to
activate the frame synchronization mode.
• The Trigger Control stage is followed by a
Trigger Divider stage inside the camera. Enter
the division ratio into the 'Divider' field.
Camera Control dialog
