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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

i/jointfilesconvert/1732015/bgts). 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.

•

i/jointfilesconvert/1732015/bgts 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

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 115 116

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