National Instruments 653 Series User Manual page 136

propagation delay
protocol
PXI
R
real time
REQ
RGND
RT Series DAQ
device
RTSI bus
S
s
S
S/s
sample
© National Instruments Corporation
The amount of time required for a signal to pass through a circuit.
The exact sequence of bits, characters and control codes used to transfer
data between computers and peripherals through a communications
channel, such as the GPIB.
PCI eXtensions for Instrumentation—a rugged, open system for modular
instrumentation based on CompactPCI, with special mechanical, electrical,
and software features.
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.
Request—Handshaking signal generated by the peripheral device,
indicating it is ready. In some transfer modes, the NI 653X can internally
generate a REQ signal. The REQ signal with a bar above the name indicates
it is an inverted request signal.
reserved ground
A collection of one, two, or four ports and an associated timing controller.
All handshaking I/O, pattern I/O and buffered operations must be
performed on groups.
Real-Time System Integration Bus—the National Instruments timing bus
that connects DAQ devices directly, by means of connectors on top of the
devices, for precise synchronization of functions
seconds
samples
samples per second—used to express the rate at which a DAQ device
samples an analog signal.
An instantaneous measurement of a signal, normally using an
analog-to-digital convertor in a DAQ device.
G-7
Glossary
NI 653X User Manual