National Instruments NI-488.2 NI-488.2 User Manual page 124

S
s
SDC
semaphore
serial poll
service request
source handshake
SPD
SPE
SRQ
status byte
status word
synchronous
System Controller
© National Instruments Corporation
Seconds.
Selected Device Clear—The GPIB command used to reset internal or
device functions of an addressed Listener. See also DCL.
An object that maintains a count between zero and some maximum value,
limiting the number of threads that are simultaneously accessing a shared
resource.
The process of polling and reading the status byte of one device at a time.
See also parallel poll.
See SRQ.
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
Serial Poll Disable—The GPIB command used to cancel an SPE command.
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.
Service Request—The GPIB line that a device asserts to notify the CIC that
the device needs servicing.
The IEEE 488.2-defined data byte sent by a device when it is serially
polled.
See ibsta.
Refers to the relationship between the GPIB driver functions and a process
when executing driver functions is predictable; the process is blocked until
the driver completes the function.
The single designated Controller that can assert control (become CIC of the
GPIB) by sending the Interface Clear (IFC) message. Other devices can
become CIC only by having control passed to them.
and handshake.
G-7
Glossary
NI-488.2 User Manual