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Glossary
NI-VXI User Manual G-10 © National Instruments Corporation
N
NI-VXI The National Instruments bus interface software for VME/VXIbus
systems.
nonprivileged access One of the defined types of VMEbus data transfers; indicated by
certain address modifier codes. Each of the defined VMEbus address
spaces has a defined nonprivileged access mode.
NULL A special value to denote that the contents (usually of a pointer) are
invalid or zero.
O
octal Numbering system with base 8, using numerals 0 to 7.
P
parse The act of interpreting a string of data elements as a command to
perform a device-specific action.
peek To read the contents.
pointer A data structure that contains an address or other indication of storage
location.
poke To write a value
ppm Parts per million
privileged access See Supervisory Access.
propagation Passing of signal through a computer system.
protocol Set of rules or conventions governing the exchange of information
between computer systems.
Q
query Like command, causes a device to take some action, but requires a
response containing data or other information. A command does not
require a response.