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Glossary
NI-488.2 User Manual G-4 ni.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
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.
ibcnt, ibcntl After each NI-488.2 I/O call, these global variables contain 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.
ISA Industry Standard Architecture.
ist An Individual Status bit of the status byte used in the Parallel Poll
Configure function.