Camera files communicate with driver software to indicate supported features and how to change them, as well as how data is transferred between the camera and the device. The NI-IMAQdx driver (and the obsolete NI-IMAQ for IEEE 1394 legacy driver) queries FireWire cameras for features and attributes and allows the user to change them programmatically. You can use IEEE 1394 equipment with NI-IMAQdx if your framegrabber features the OHCI chipset and if your camera returns uncompressed data that conforms to the 1394 Trade Association Specifications (see the Related Links section below), specifically the IIDC 1394-based Digital Camera Specification.
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