Technical data

Status Reporting 6
Agilent Infiniium 90000 Series Oscilloscopes Programmer's Reference 113
Trigger Armed Event Register
The Trigger Armed Event Register (TDER) sets bit 5 (WAIT TRIG) in the
Operation Status Register when the oscilloscope becomes armed.
The ARM event register stays set until it is cleared by reading the register
with the AER? query. If your application needs to detect multiple triggers,
the ARM event register must be cleared after each one.