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Glossary
NI-488.2 User Manual for Windows G-4 www.natinst.com
hex Hexadecimal; a number represented in base 16. For example, decimal 16 is
hex 10.
high-level function See device-level function.
HS488 A high-speed data transfer protocol for IEEE 488. This protocol increases
performance for GPIB reads and writes up to 8 Mbytes/s, depending on
your system.
Hz Hertz.
I
ibcnt
After each NI-488.2 I/O call, this global variable contains the actual
number of bytes transmitted. On systems with a 16-bit integer, such as
MS-DOS,
ibcnt
is a 16-bit integer, and
ibcntl
is a 32-bit integer. For
cross-platform compatibility, use
ibcntl
.
ibcntl
After each NI-488.2 I/O call, this global variable contains the actual
number of bytes transmitted. On systems with a 16-bit integer, such as
MS-DOS,
ibcnt
is a 16-bit integer, and
ibcntl
is a 32-bit integer. For
cross-platform compatibility, use
ibcntl
.
iberr
A global variable that contains the specific error code associated with a
function call that failed.
ibsta
At the end of each function call, this global variable (status word) contains
status information.
IEEE Institute of Electrical and Electronic Engineers.
interface message A broadcast message sent from the Controller to all devices and used to
manage the GPIB.
I/O Input/output. In this manual, it is the transmission of commands or
messages between the system via the GPIB board and other devices on the
GPIB.
I/O address The address of the GPIB board from the point of view of the CPU, as
opposed to the GPIB address of the GPIB board. Also called port address
or board address.