Glossary
IMAQ PCI-1428 User Manual G-4 ni.com
F
FIFO First-in first-out memory buffer. The first data stored is the first data sent
tot he acceptor; FIFOs are used on IMAQ devices to temporarily store
incoming data until that data can be retrieved.
ft Feet.
H
hHour.
Hz Hertz. Frequency in units of one cycle per second.
I
I/O Input/output. The transfer of data to/from a computer system involving
communications channels, operator interface devices, and/or data
acquisition and control interfaces.
IC Integrated circuit.
IEEE Institute of Electrical and Electronics Engineers.
in. Inches.
instrument dri ver A set of high-level software functions, such as NI-IMAQ, that control
specific plug-in computer boards. Instrument drivers are available in
several forms, ranging from a function callable from a programming
language to a virtual instrument (VI) in LabVIEW.
interrupt A computer signal indicating that the CPU should suspend its current task
to service a designated activity.
interrupt lev el The relative priority at which a device can interrupt.
IRQ Interrupt request. See interrupt.