Xtium2-CXP PX8 User's Manual
CamExpert Quick Start
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35
Parameter Descriptions
The following table describes the CamExpert External Trigger category of Sapera LT parameters.
Display Name
Parameter
Description
External Trigger
CORACQ_PRM_EXT_TRIGGER_ENABLE (area scan)
CORACQ_PRM_EXT_FRAME_TRIGGER_ENABLE
(line scan)
Enables/disables external trigger on the acquisition
board. When enabled, the acquisition board acquires an
image frame from the camera after receiving the trigger.
Boolean parameter (TRUE or FALSE).
External Trigger
Detection
CORACQ_PRM_EXT_TRIGGER_DETECTION (area
scan)
CORACQ_PRM_EXT_FRAME_TRIGGER_DETECTION
(line scan)
Defines the signal detected that generates an external
trigger event to the acquisition device.
Two types of trigger are available:
Level Trigger: Active Low / High
Logic level (Low/High) on the trigger input enables
continuous image capture until the trigger input is set to
opposite logic .
Edge Trigger: Rising / Falling edge
Edge transition of a trigger pulse captures one image
frame.
Line scan cameras also support:
Dual-Input Trigger Rising Edge / Dual-Input Trigger
Falling Edge
External Trigger
Level
CORACQ_PRM_EXT_TRIGGER_LEVEL (area scan)
CORACQ_PRM_EXT_FRAME_TRIGGER_LEVEL (line
scan)
Specifies the electrical level of the external trigger
connected to the acquisition board.
Possible values:
TTL
single-ended logic signal
RS-422
balanced logic signal
12V
single-ended logic signal
24V
single-ended logic signal
External Trigger
Source
CORACQ_PRM_EXT_TRIGGER_SOURCE (area scan)
CORACQ_PRM_EXT_FRAME_TRIGGER_SOURCE
(line scan)
Specifies the physical input source the external frame
trigger is connected to or which trigger input is used on
the acquisition device.
Note: to assign the external trigger source to a GPIO it
must be reserved; By default, boards are shipped with
User Interface General Inputs 1 & 2 reserved for External
Triggers and User Interface General Outputs 1 & 2
reserved for Strobe Outputs.
Refer to Information Field Description for more
information on using the Teledyne DALSA Device
Manager tool to reserve GPIOs.
External Trigger
Minimum Duration
(in μs)
CORACQ_PRM_EXT_TRIGGER_DURATION
Minimum external trigger pulse duration (in µs), needed
for the pulse to be acknowledged by the acquisition
device. If the duration of the pulse is shorter, the pulse is
ignored.
This feature is useful for trigger pulse debouncing. If the
value is ‘0’, no validation is performed
Frame Count per
External Trigger
CORACQ_PRM_EXT_TRIGGER_FRAME_COUNT
Number of images to acquire upon receiving an external
trigger. Valid range is 1-262142.
Note, infinite frame count (-1) is not supported.
External Trigger
Delay
Sets the delay between the reception of the trigger signal
and the start of the image acquisition. Units are specified
by the External Trigger Delay Time Base parameter.
External Trigger
Delay Time Base
CORACQ_PRM_EXT_TRIGGER_DELAY_TIME_BASE
Sets the external trigger delay time base.
Possible values:
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Line Counts
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Nanoseconds
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External Line Trigger or Shaft Encoder
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Shaft Encoder
