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Glossary
VXI-MIO Series User Manual G-12
National Instruments Corporation
plug and play devices Devices that do not require dip switches or jumpers to configure
resources on the devices—also called switchless devices.
port (1) A communications connection on a computer or a remote
controller. (2) A digital port, consisting of four or eight lines of
digital input and/or output.
ppm parts per million
pretriggering The technique used on a DAQ board to keep a continuous buffer
filled with data, so that when the trigger conditions are met, the
sample includes the data leading up to the trigger condition.
Q
quantization error The inherent uncertainty in digitizing an analog value due to the
finite resolution of the conversion process.
R
RAM random access memory
referenced signal sources Signal sources with voltage signals that are referenced to a system
ground, such as the earth or a building ground. Also called
grounded signal sources.
relative accuracy A measure in LSB of the accuracy of an ADC. It includes all non-
linearity and quantization errors. It does not include offset and
gain errors of the circuitry feeding the ADC.
RESMAN
The name of the National Instruments Resource Manager in
NI-VXI bus interface software. See
Resource Manager
.
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.
Resource Manager A message-based Commander, located at logical address 0, which
provides configuration management services such as address map
configuration, Commander and Servant mappings, and self-test
and diagnostics management
responses Signals or interrupts generated by a device to notify another
device of an asynchronous event. Responses contain the
information in the Response register of a sender.