National Instruments NI 653 Series, User Manual, Page: 136 / 151

Glossary
NI 653X User Manual G-6 ni.com
mask The bits that are significant for pattern detection, also applies to change
detection.
MSB most significant bit
0
open collector Output driver that drives its output pin to 0 V for logic low, but puts the pin
in the high-impedance state for logic high.
P
pattern I/O Data-transfer mode in which NI 653 X transfers data on the falling or rising
edge of a TTL signal, typically at a constant rate.
PCI Peripheral Component Interconnect—A high-performance expansion bus
architecture originally developed by Intel to replace ISA and EISA. It has
achieved widespread acceptance as a standard for PCs and workstations; it
offers a theoretical maximum transfer rate of 132 MB/s.
PCLK See control signals
PCMCIA An expansion bus architecture that has found widespread acceptance as a
de facto standard in notebook-sized computers. It originated as a
specification for add-on memory cards written by the Personal Computer
Memory Card International Association.
peripheral device Any external device connected to the NI 653 X that the NI 653 X controls,
monitors, tests, or with which it communicates.
PLL phase lock loop
Plug and Play ISA A specification prepared by Microsoft, Intel, and other PC-related
companies that will result in PCs with plug-in boards that can be fully
configured in software, without jumpers or switches on the devices.
port A collection of lines, usually eight.
posttrigger Acquiring data that occurs after a trigger.
PPI programmable peripheral interface
pretrigger Acquiring data that occurs before a trigger.