GPIB Control Lines Trigger Condition

From GPIB Analyzer

The GPIB control lines trigger condition can be entered for each of the GPIB control lines using the spin controls for EOI, ATN, SRQ, REN, IFC, NRFD, NDAC, and DAV. Note that the x value ("don't care") can be chosen for GPIB control lines whose state is not relevant to the trigger condition.