National Instruments NI-488.2 - Manual (Page 103)

Appendix B Status Word Conditions
NI-488.2 User Manual B-4 ni.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).