24 • Camera Features Linea HS Series Camera User's Manual
Camera Features
This section is intended to be a progressive introduction to camera features, including explanations
of how to use them effectively.
Synchronizing to Object Motion
Acquiring Images: Triggering the Camera
Related Features: TriggerMode, TriggerSource, TriggerActivation
Several different methods can be used to trigger image acquisition in the camera:
Internal Trigger
The simplest method is to set the Trigger Mode feature to “Internal”. This results in the camera
being triggered by an internal timer, which can be adjusted using the Acquisition Line Rate feature.
This is useful when setting up the camera with a static image.
Note that if the object is moving, the internal line rate must match the object speed in mm/sec
divided by the selected pixel size of 0.042mm for 600dpi or 0.028mm for 900dpi to ensure correct
alignment of the sensors images.
External Triggers
When the Trigger Mode feature is set to “External”, the camera triggers come from a different
source selected through the Trigger Source feature.
The available sources for the triggers are from pins 1 & 2 (Phase A) of the GPIO connector, from
the Camera Link HS frame grabber, or from the rotary encoder feature (using pin 1, 2, 3 & 4 of the
GPIO connector).
Use the Trigger Activation feature to select the edge that triggers the camera. The options are:
Rising Edge, Falling Edge or Any Edge. When using Any Edge be careful that the time between
edges does not exceed the maximum line rate of the module. If the line rate is exceeded edges
will be ignored.
CamExpert can be used to configure the frame grabber for routing the encoder signal from the
frame grabber input to the trigger input of the module via the Camera Link HS data cable.
Line Rate & Synchronization
A continuous stream of encoder trigger pulses, synchronized to the object motion, establishes the
line rate. The faster the object’s motion is, the higher the line rate. The module can accommodate
triggers up to its specified maximum frequency as dictated by the exposure time. If the maximum
frequency is exceeded, the module will continue to output image data at the maximum specified.
The result will be that some trigger pulses will be missed and there will be an associated distortion
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