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DIO

Digital Input/Output

DMA

Direct Memory Access—A method by which data is 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.

DR

Data Receive

drivers/driver software

Software that controls a specific hardware device such as a DAQ device.

DSP

(1) Digital Signal Processing
(2) Digital Signal Processor—a specialized microprocessor designed 
specifically for digital signal processing, generally in real-time. Digital 
signal processors can also be used to perform general-purpose 
computation, though they are not optimized for this function.

dual-access memory

Memory that can be sequentially accessed by more than one controller or 
processor but not simultaneously accessed. Also known as shared memory.

EEPROM

Electrically Erasable Programmable Read-Only Memory—ROM that can 
be erased with an electrical signal and reprogrammed. 

EMC

electromagnetic compliance

EMI

electromagnetic interference

event

The condition or state of an analog or digital signal.

expansion connector

A connector on the device for connecting additional signals to the DSP.

F

(1) Fahrenheit—A temperature measurement scale. 
(2) farad—A measurement unit of capacitance.

FIFO

First-In First-Out memory buffer—The first data stored is the first data sent 
to the acceptor. FIFOs are often used on DAQ devices to temporarily store 
incoming or outgoing data until that data can be retrieved or output.