Glossary
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National Instruments Corporation
G-9
DAQCard-DIO-24 User Manual
OUT
output pin—a counter output pin where the counter can generate
various TTL pulse waveforms
P
PA
port A
pattern generation
a type of handshaked (latched) digital I/O in which counters generate
the handshaked signal, which in turn initiates a digital transfer. Because
counters output digital pulses at a constant rate, this means you can
generate and retrieve patterns at a constant rate because the handshaked
signal is produced at a constant rate
PB
port B
PC
port C, or personal computer
PC Card
a credit-card-sized expansion card that fits in a PCMCIA slot; often
referred to as a PCMCIA card
PCI
Peripheral Component Interconnect—a high-performance expansion
bus architecture originally developed by Intel to replace ISA and EISA.
It is achieving widespread acceptance as a standard for PCs and work-
stations; it offers a theoretical maximum transfer rate of 132 Mbytes/s
PCMCIA
an expansion bus architecture that has found widespread acceptance as
a de facto standard in notebook-size computers. It originated as a
specification for add-on memory cards written by the Personal
Computer Memory Card International Association
Plug and Play devices
devices that do not require dip switches or jumpers to configure
resources on the devices—also called switchless devices
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 boards
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
PPI
programmable peripheral interface
