Measurement Computing GPIB-488 - Manual (Page 106)

Appendix B IBSTA
Programming Reference Manual B-4 GPIB-488
TACS Talker. If this bit = 1, the GPIB Interface Board has been addressed as a talker.
This bit is cleared when one of the following occurs:
• The UNT command is sent.
• The GPIB Interface Board is sent its listen
address.
• Another talker is addressed.
• IFC is asserted.
LACS Listener. If this bit = 1, the GPIB Interface Board has been addressed as a
Listener. It can also be set if the GPIB Interface Board shadow handshakes (as
a result of an
ibgts ). This bit is cleared whenever one of the following occurs:
• The GPIB Interface Board receives an UNL
(Unlisten) command.
• The GPIB Interface Board is addressed as a talker.
• ibgts is called disabling shadow handshaking.
DTAS Device Trigger Status. If this bit = 1, a GET (Group Execute Trigger)
command has been detected. This bit is cleared in the status word on any call
immediately following an
ibwait if the DTAS bit is set in the ibwait mask
parameter.
DCAS Device Clear State. If this bit = 1, a DCL (Device Clear) or SDC (Selected
Device Clear) command has been received by the GPIB Interface Board. The
bit is cleared on any call immediately following an
ibwait call if the DCAS bit
was set in the ibwait mask parameter, or on any call immediately following a
read or write.
Some of the status word bits can also be cleared under the following
circumstances:
• If ibonl is called, the END , LOK , REM , CIC , TACS ,
LACS , DTAS , and DCAS bits are cleared.
• If an ENEB or EDVR error is returned (See
Appendix C, IBERR for more information.), all of
the status word bits except ERR are cleared.
Table B-1. Bit Definitions (Continued)
Bit Description