National Instruments GPIB-PC - Manual (Page 218)

Section Six IBIC
©National Instruments Corp. 6-3 GPIB-PC User Manual
the desired combination of the flags which are listed on the following
pages.
Select one or more mask flags:
-all all GPIB calls
-err GPIB error
-timo timeout
-end GPIB-PC detected END or EOS
-srqi SRQ on
-rqs device requesting service
-cmpl I/O completed
-lok GPIB-PC is in Lockout State
-rem GPIB-PC is in Remote State
-cic GPIB-PC is Controller-In-Charge
-atn attention is asserted
-tacs GPIB-PC is Talker
-lacs GPIB-PC is Listener
-dtas GPIB-PC is in Device Trigger State
-dcas GPIB-PC is in Device Clear State