Source handshake, See also, Programmed i/o – National Instruments NI-488.2 User Manual

Page 127: Serial poll

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Glossary

© National Instruments Corporation

G-7

NI-488.2 User Manual

PPU

Parallel Poll Unconfigure—The GPIB command used to disable any device
from participating in polls.

programmed I/O

Low-speed data transfer between the GPIB interface and memory in
which the CPU moves each data byte according to program instructions.
See also

DMA

.

R

resynchronize

When the driver indicates to the application that asynchronous I/O
operations have completed.

RQS

Request Service.

S

s

Seconds.

SDC

Selected Device Clear—The GPIB command used to reset internal or
device functions of an addressed Listener. See also

DCL

.

semaphore

An object that maintains a count between zero and some maximum value,
limiting the number of threads that are simultaneously accessing a shared
resource.

serial poll

The process of polling and reading the status byte of one device at a time.
See also

parallel poll

.

service request

See SRQ.

source handshake

The GPIB interface function that transmits data and commands. Talkers use
this function to send data, and the Controller uses it to send commands.
See also

acceptor handshake

and

handshake

.

SPD

Serial Poll Disable—The GPIB command used to cancel an SPE command.

SPE

Serial Poll Enable—The GPIB command used to enable a specific device
to be polled. That device must also be addressed to talk. See also SPD.

SRQ

Service Request—The GPIB line that a device asserts to notify the CIC that
the device needs servicing.

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