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Appendix B Status Word Conditions
NI-488.2 User Manual for Windows B-4 www.natinst.com
REM (brd)
REM indicates whether the interface is in the remote state. REM is set
whenever the Remote Enable (REN) GPIB line is asserted and the GPIB
interface detects that its listen address has been sent either by the GPIB
interface or by another Controller. REM is cleared in the following
situations:
• When REN becomes unasserted.
• When the GPIB interface as a Listener detects that the Go to Local
(GTL) command has been sent either by the GPIB interface or by
another Controller.
• When the
ibloc
function is called while the LOK bit is cleared in the
status word.
CIC (brd)
CIC indicates whether the GPIB interface is the Controller-In-Charge. CIC
is set when the
SendIFC
or
ibsic
call is executed either while the GPIB
interface is System Controller or when another Controller passes control to
the GPIB interface. CIC is cleared either when the GPIB interface detects
Interface Clear (IFC) from the System Controller or when the GPIB
interface passes control to another device.
ATN (brd)
ATN indicates the state of the GPIB Attention (ATN) line. ATN is set
whenever the GPIB ATN line is asserted, and it is cleared when the ATN
line is unasserted.
TACS (brd)
TACS indicates whether the GPIB interface is addressed as a Talker. TACS
is set whenever the GPIB interface detects that its talk address (and
secondary address, if enabled) has been sent either by the GPIB interface
itself or by another Controller. TACS is cleared whenever the GPIB
interface detects the Untalk (UNT) command, its own listen address, a talk
address other than its own talk address, or Interface Clear (IFC).