
Glossary
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National Instruments Corporation G-5 DAQ Hardware Overview Guide
differential input An analog input consisting of two terminals, both of which are isolated
from computer ground, whose difference is measured.
digital port See port.
DIN Deutsche Industrie Norme
DIO digital I/O
DLL Dynamic-link library. A software module in Microsoft Windows
containing executable code and data that can be called or used by Windows
applications or other DLLs. Functions and data in a DLL are loaded and
linked at run time when they are referenced by a Windows application or
other DLLs.
DMA Direct memory access. A method by which data can be transferred to/from
computer memory from/to a device or memory on the bus while the
processor does something else. DMA is the fastest method of transferring
data to/from computer memory.
driver Software that controls a specific hardware device such as a DAQ device or
a GPIB interface device.
DSA Dynamic Signal Acquisition
DSP digital signal processing
E
EEPROM Electronically erasable programmable read-only memory. ROM that can be
erased with an electrical signal and reprogrammed.
EGA enhanced graphics adapter
EISA Extended Industry Standard Architecture
external trigger A voltage pulse from an external source that triggers an event such as A/D
conversion.
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