IEEE488.2 and SCPI registers are used for the status reports.
In each SCPI status register, there are the following sub registers: CONDition register, EVENt register, ENABle register, PTRansition filter, and NTRansition filter.
The transition of the CONDition register is automatic and reflects the condition of the PCR in real-time. Reading this register does not affect the contents.
The EVENt register bits are automatically set according to the changes in the CONDition register. The rule varies depending on the positive and negative transition filters (PTRansition and NTRansition). The EVENt register is reset when it is read.
The ENABle register enables the reports to the summary bit or status bit of the event bit.
If both the positive filter and the negative filter are set to true, events can be reported each time the status changes.
If both filters are cleared, event reporting is disabled.