National Instruments IEEE 1394 用户手册

© National Instruments Corporation

To modify camera attributes in LabVIEW, use the IMAQ1394 Property 
Node. Every camera attribute has three parameters: Attribute Key, 
Attribute Mode, and Attribute Value.

•

Attribute Key—Select from a list of supported keys, including 
Brightness, Gain, Shutter Speed, and White Balance. Use 
IMAQ1394 GetFeatures to return a list of supported camera attributes.

•

Attribute Mode—Select from a list of supported modes, including 
Absolute, Auto, Off, One Push, Relative, and Ignore. Use the 
Inquiry property node to determine if a mode is supported by the 
current camera. The Ignore mode is supported by all cameras

•

Attribute Value—Enter a numeric value for the attribute. This 
parameter applies only to camera attribute when using Absolute or 
Relative camera mode. Use the Range property nodes to find the valid 
range for the current camera.

Figure 4-10 shows a VI with the shutter camera attribute set to Absolute 
mode with a value of 0.014s.

Figure 4-10.  Setting Camera Attributes with Property Nodes

Every NI-IMAQ for IEEE 1394 Cameras VI contains an error in input 
cluster and an error out output cluster. The clusters, shown in Figure 4-11, 
contain a Boolean value that indicates whether an error occurred, the code 
for the error, and the source or the name of the VI that returned the error. If 
error in indicates an error, the VI passes the error information to error out 
and does not execute any NI-IMAQ for IEEE 1394 Cameras function.