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Glossary
NI-488.2 User Manual G-2 ni.com
C
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.
D
DAV Data Valid—One of the three GPIB handshake lines. See also handshake.
DCL Device Clear—The GPIB command used to reset the device or internal
functions of all devices. See also 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 also programmed I/O.
driver Device driver software installed within the operating system.
E
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.