National Instruments NI-488.2 Benutzerhandbuch

CFE

Configuration Enable. The GPIB command which precedes CFGn and is 
used to place devices into their configuration mode.

CFGn

These GPIB commands (CFG1 through CFG15) follow CFE and are used 
to configure all devices for the number of meters of cable in the system so 
HS488 transfers occur without errors.

CIC

Controller-In-Charge. The device that manages the GPIB by sending 
interface messages to other devices.

CPU

Central processing unit.

DAV 

Data Valid. One of the three GPIB handshake lines. See handshake.

DCL

Device Clear. The GPIB command used to reset the device or internal 
functions of all devices. See SDC.

device-level function

A function that combines several rudimentary board operations into one 
function so that the user does not have to be concerned with bus 
management or other GPIB protocol matters. 

DIO1 through DIO8

The GPIB lines that are used to transmit command or data bytes from one 
device to another.

DLL

Dynamic link library.

DMA 

Direct memory access. High-speed data transfer between the GPIB board 
and memory that is not handled directly by the CPU. Not available on some 
systems. See programmed I/O.

driver

Device driver software installed within the operating system. 

END or END Message

A message that signals the end of a data string. END is sent by asserting 
the GPIB End or Identify (EOI) line with the last data byte.

EOI

A GPIB line that signals either the last byte of a data message (END) or 
the parallel poll Identify (IDY) message.