National Instruments NI-488.2 User Manual page 92

SRQI (brd)
RQS (dev)
CMPL (dev, brd)
LOK (brd)
© National Instruments Corporation
SRQI indicates that a GPIB device is requesting service. SRQI is set
whenever the GPIB interface is CIC, the GPIB SRQ line is asserted, and the
automatic serial poll capability is disabled. SRQI is cleared either when the
GPIB interface ceases to be the CIC or when the GPIB SRQ line is
unasserted.
RQS appears in the status word only after a device-level call and indicates
that the device is requesting service. RQS is set whenever one or more
positive serial poll response bytes have been received from the device. A
positive serial poll response byte always has bit 6 asserted. Automatic serial
polling must be enabled (it is enabled by default) for RQS to automatically
appear in . You can also wait for a device to request service
ibsta
regardless of the state of automatic serial polling by calling
mask that contains RQS. Do not issue an
that does not respond to serial polls. Use
response byte that was received. RQS is cleared when all of the stored serial
poll response bytes have been reported to you through the
CMPL indicates the condition of I/O operations. It is set whenever an I/O
operation is complete. CMPL is cleared while the I/O operation is in
progress.
LOK indicates whether the interface is in a lockout state. While LOK is set,
the or
EnableLocal
set whenever the GPIB interface detects that the Local Lockout (LLO)
message has been sent either by the GPIB interface or by another
Controller. LOK is cleared when the System Controller unasserts the
Remote Enable (REN) GPIB line.
Appendix B
ibwait
ibrsp
call is inoperative for that interface. LOK is
ibloc
B-3
Status Word Conditions
with a
ibwait
call on RQS for a device
to acquire the serial poll
function.
ibrsp
NI-488.2 User Manual for Windows