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Serial Poll
Service Request
Source Handshake
SPD
(Serial Poll Disable)
SPE
(Serial Poll Enable)
SRQ (Service Request)
Status Byte
Status Word
Synchronous
System Controller
© National Instruments Corp.
The process of polling and reading the status
byte of one device at a time. See 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 Acceptor Handshake and
Handshake.
Serial Poll Disable is the GPIB command used to
cancel an SPE command.
Serial Poll Enable is the GPIB command used to
enable a specific device to be polled. That
device must also be addressed to talk. See SPD.
The GPIB line that a device asserts to notify the
CIC that the device needs servicing.
The data byte sent by a device when it is serially
polled.
See ibsta.
Refers to the relationship between the
NI-488.2M driver functions and a process when
executing driver functions is predictable; the
process is blocked until the OS/2 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.
G-9
NI-488.2M SRM for OS/2
Glossary
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