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Chapter 2 Basic Acquisition with NI-IMAQ for IEEE 1394 Cameras
© National Instruments Corporation 2-3 NI-IMAQ for IEEE 1394 Cameras User Manual
Every camera has an .iid interface file and an .icd camera file.
• Interface files—Store information about which physical camera is
associated with a camera name. Each interface file can be used by only
a single camera.
• Camera files—Store all the configurable attributes. Camera files can
be shared between identical cameras. Use MAX to configure the
default state of a particular camera.
Figure 2-1 shows the relationship between cameras, interface files, and
camera files.
Figure 2-1. Relationship Between Cameras, Interface Files, and Camera Files
Note
Use the Enumerate function to query the number and names of available cameras.
When you open a camera session with the Initialize function, the camera
with the unique serial number described by the interface file
cam
n
.iid
opens, where
n
is the reference to the camera. If the camera is not present
and a camera of the same make and model is present, as described in the
interface file, the driver opens the available camera. The interface file
updates to use the new camera. The camera file described by the interface
Table 2-1. Camera Naming Convention
Camera Name IEEE 1394 Camera Installed
cam0
Device 0
cam1
Device 1
... ...
cam
n
Device n
Default.icdCam1.iid
MyCam.icdCam0.iid
or