R&S ESR Series User Manual page 579

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R&S ESR
Figure 11-2: The status-register model
Description of the five status register parts
The five parts of a SCPI register have different properties and functions:
●
CONDition
The CONDition part is written into directly by the hardware or the sum bit of the
next lower register. Its contents reflect the current instrument status. This register
part can only be read, but not written into or cleared. Its contents are not affected
by reading.
●
PTRansition / NTRansition
The two transition register parts define which state transition of the CONDition
part (none, 0 to 1, 1 to 0 or both) is stored in the EVENt part.
The Positive-TRansition part acts as a transition filter. When a bit of the
CONDition part is changed from 0 to 1, the associated PTR bit decides whether
the EVENt bit is set to 1.
–
–
This part can be written into and read as required. Its contents are not affected by
reading.
The Negative-TRansition part also acts as a transition filter. When a bit of the
CONDition part is changed from 1 to 0, the associated NTR bit decides whether
the EVENt bit is set to 1.
–
–
This part can be written into and read as required. Its contents are not affected by
reading.
●
EVENt
The EVENt part indicates whether an event has occurred since the last reading, it
is the "memory" of the condition part. It only indicates events passed on by the
transition filters. It is permanently updated by the instrument. This part can only be
User Manual 1175.7068.02 ─ 12
PTR bit =1: the EVENt bit is set.
PTR bit =0: the EVENt bit is not set.
NTR bit =1: the EVENt bit is set.
NTR bit =0: the EVENt bit is not set.
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