Status Reporting 7
Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Reference 521

Operation Status Event Register (:OPERegister[:EVENt])

This register hosts the RUN bit (bit 3), the WAIT TRIG bit (bit 5), and the
OVLR bit (bit 11).
The RUN bit is set whenever the instrument goes from a stop state to a
single or running state.
The WAIT TRIG bit is set by the Trigger Armed Event Register and
indicates that the trigger is armed.
The OVLR bit is set whenever a 50 input overload occurs.
If any of these bits are set, the OPER bit (bit 7) of the Status Byte
Register is set. The Operation Status Event Register is read and cleared
with the :OPERegister[:EVENt]? query. The register output is enabled or
disabled using the mask value supplied with the OPEE command.