National Instruments GPIB-MAC User Manual page 110

November 1985
DTAS 2
The DTAS bit specifies whether the GPIB-MAC has
detected a device trigger command. The DTAS bit is set
whenever the GPIB-MAC as a Listener, detects the Group
Execute Trigger (GET) command has been sent by another
Controller. The DTAS bit is cleared in status at the start of
any subsequent programming message.
DCAS 1
The DCAS bit specifies whether the GPIB-MAC has
detected a device clear command The DCAS bit is set
whenever the GPIB-MAC detects the Device Clear (DCL)
command has been sent by itself or by another Controller, or
whenever the GPIB-MAC as a Listener detects the Selected
Device Clear (SDC) command has been sent by itself or by
another Controller. The DCAS bit is cleared in
start of any subsequent programmin g message.
In addition to the above, the following situations also affect the bits
status:
in
* A calI to the
END LGK REM CIC TACS LACS DTAS DCAS
* A call to
according to the rules explained for each bit.
GPIB Error Codes
When the ERR bit is set in
occurred. The error code is indicated by
error.
The following paragraphs describe the
100 APPENDIX B - STATUS INFORMATION
function clears the following bits:
affects bits other than those listed here
status,
a GPIB or a serial port error has
gpib-error or serial-
gpib-errors in
at the
detail