Glossary
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National Instruments Corporation
G-5
O
open collector
signaling technology that allows more than one driver to control an I/O line.
Each driver may drive the line to 0 V, but must not drive a high voltage. A
pull-up resistor pulls the line high when all drivers are in a high-impedance
state.
P
PCI
Peripheral Component Interconnect—the PCI bus is a high-performance
32-bit or 64-bit bus with multiplexed address and data lines.
peripheral
any hardware device connected to a computer, such as a monitor, keyboard,
printer, plotter, disk or tape drive, graphics tablet, scanner, mouse, and so on
POSC
Power On Self Configuration
PXI
PCI eXtensions for Instrumentation—an open implementation of
CompactPCI that adds electrical features that meet the high-performance
requirements of instrumentation applications by providing triggering, local
buses, and system clock capabilities. PXI also offers two-way
interoperability with CompactPCI products.
R
RAM
Random Access Memory—the computer’s primary workspace
resource
hardware settings used by devices in a computer system, including ISA
interrupt level, DMA channel, and I/O address
RMS
root mean squared.
See
RS-232
an asynchronous serial data transmission standard. RS-232 links between
equipment are normally limited to 50 ft (16 m). Also referred to as
RS-232C.
RTC
Real Time Clock—an electronic circuit that maintains the time of day,
and also can provide timing signals for timesharing operations
RTSI
the National Instruments timing bus that connects DAQ devices directly, by
means of connectors on top of the devices, for precise synchronization of
functions
