Tektronix AFG2021 Programmer's Manual page 120

Status and Events
Standard/Event Status
Block
3-2
Figure 3-1: Error and event handling process
This block is used to report power on/off, command error, and command
execution status.
The block has two registers: the Standard Event Status Register (SESR) and the
Event Status Enable Register (ESER). Refer to the Standard/Event Status Block
shown at the bottom of the previous figure. (See Figure 3-1.)
AFG2021 Arbitrary Function Generator Programmer Manual