Stuck SRQ State
If autopolling is enabled and the GPIB interface detects an SRQ, the driver serial polls all open devices connected to that interface. The serial poll continues until either SRQ unasserts or all the devices have been polled.
If no device responds positively to the serial poll, or if SRQ remains in effect because of a faulty instrument or cable, a stuck SRQ state is in effect. If this happens during an ibwait for RQS, the driver reports the ESRQ error. If the stuck SRQ state happens, no further polls are attempted until an ibwait for RQS is made. When ibwait is issued, the stuck SRQ state is terminated and the driver attempts a new set of serial polls.
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