Agilent Technologies Infiniium 8000A Programmer's Reference Manual page 62

Bit Description
OPC Operation Complete
OPER Operation Status Register Indicates if any of the enabled conditions in the
RQS Request Service
MSS Master Summary Status Indicates if a device has a reason for requesting service.
ESB Event Status Bit
MAV Message Available
MSG Message
USR User Event Register
TRG Trigger
WAIT TRIG Wait for Trigger
4-4
Definition
Indicates if the device has completed all pending
operations.
Operation Status Register have occurred.
Indicates that the device is requesting service.
Indicates if any of the enabled conditions in the Standard
Event Status Register have occurred.
Indicates if there is a response in the output queue.
Indicates if an advisory has been displayed.
Indicates if any of the enabled conditions have occurred
in the User Event Register.
Indicates if a trigger has been received.
Indicates the oscilloscope is armed and ready for
trigger.