Glossary
NI PCIe-1427 User Manual
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R
real time
A property of an event or system in which data is processed as it is acquired
instead of being accumulated and processed at a later time.
resolution
The smallest signal increment that can be detected by a measurement
system. Resolution can be expressed in bits, in proportions, or in
percent of full scale. For example, a system has 12-bit resolution,
one part in 4,096 resolution, and 0.0244 percent of full scale.
RGB
Color encoding scheme using red, green, and blue (RGB) color information
where each pixel in the color image is encoded using 32 bits: eight bits for
red, eight bits for green, eight bits for blue, and eight bits for the alpha value
(unused).
ROI
Region of interest. A hardware-programmable rectangular portion of the
acquisition window.
RS-422
A robust, serial digital data interchange standard utilizing individual
differential signal pairs for data transmission in each direction. Depending
on data transmission rates, RS-422 can be used at distances to 4,000 ft
(1,275 m).
RTSI bus
Real-Time System Integration Bus. The National Instruments timing bus
that connects Vision and DAQ devices directly, by means of connectors on
the devices, for precise synchronization of functions.
S
scatter-gather DMA
A type of DMA that allows the DMA controller to reconfigure on-the-fly.
T
tap
A stream of pixels from a camera. Some cameras send multiple streams,
or taps, of data over a cable simultaneously to increase transfer rate.
transfer rate
The rate, measured in bytes/s, at which data is moved from source to
destination after software initialization and set up operations. The
maximum rate at which the hardware can operate.
trigger
Any event that causes or starts some form of data capture.
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