Agilent Technologies 5000 Series Trigger Event Register (TER)

Status Reporting 7
Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Reference 515
Trigger Event Register (TER)
This register sets the TRG bit in the status byte when a trigger event
occurs.
The TER event register stays set until it is cleared by reading the register
or using the *CLS command. If your application needs to detect multiple
triggers, the TER event register must be cleared after each one.
If you are using the Service Request to interrupt a program or controller
operation, you must clear the event register each time the trigger bit is
set.