Glossary
LabWindows/CVI Standard Libraries G-2 © National Instruments Corporation
in hardware, no data is transferred to system memory until the trigger
condition has occurred.
ANSI American National Standards Institute.
AO Analog output.
asynchronous (1) Hardware—A property of an event that occurs at an arbitrary time,
without synchronization to a reference clock.
(2) Software—A property of a function that begins an operation and
returns prior to the completion or termination of the operation.
automatic serial A feature in which serial polls are executed automatically by the GPIB
polling driver whenever a device asserts the SRQ line.
B
B Bytes.
background
acquisition Data is acquired by a DAQ system while another program or processing
routine is running without apparent interruption.
bipolar A signal range that includes both positive and negative values (for
example, -5 V to +5 V).
block-mode A high-speed data transfer in which the address of the data is sent followed
by a specified number of back-to-back data words.
C
CodeBuilder The LabWindows/CVI feature that creates code based on a .uir file to
connect your GUI to the rest of your program. This code is complete and
can be compiled and run as soon as it is created.
cold-junction
compensation A method of compensating for inaccuracies in thermocouple circuits.
conversion time The time required, in an analog input or output system, from the moment a
channel is interrogated (such as with a read instruction) to the moment that
accurate data is available.
counter/timer A circuit that counts external pulses or clock pulses (timing).
coupling The manner in which a signal is connected from one location to another.