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Chapter 3 Advanced Programming with NI-IMAQdx
© National Instruments Corporation 3-7 NI-IMAQdx User Manual
The Increment values are camera-specific. Refer to the camera
documentation or query the Increment attributes for width and height
to obtain the actual values.
Figure 3-2. Partial Image Size Format (Scalable)
Trigger Modes
The IIDC 1.31 and GigE Vision 1.0 specifications provide several external
triggering modes for cameras. A camera may support one or more of the
triggering modes. Additionally, a camera may support triggering modes
that are vendor specific. Refer to your camera documentation to find out
which standard modes are supported.
Configure triggers before configuring and starting the acquisition. Use the
Camera Attribute functions to configure the triggers.
Trigger Modes for IIDC Cameras
All IIDC cameras that support triggering have the following attributes:
• TriggerMode—Specifies one of the trigger modes—Mode0,
Mode1...Mode5—described in the following sections. A value of Off
indicates that the camera is not externally triggered.
• TriggerActivation—Specifies when the trigger input is active. A
value of LevelHigh indicates that the trigger is considered active when
the signal is high. A value of LevelLow indicated that the trigger is
considered active when the signal is low.
(max width, max height)
Acquired Sub-Image
Offset X
Offset Y
Height
Increment
Width
Increment
(0,0)