Network operation and remote control
R&S
®
SMM100A
592
User Manual 1179.1341.02 ─ 05
Figure 12-7: The status-register model
Description of the five status register parts
The five parts of a SCPI status register have different properties and functions:
●
CONDition
The
CONDition
part is written directly by the hardware or it mirrors the sum bit of
the next lower register. Its contents reflect the current instrument status. This regis-
ter part can only be read, but not written into or cleared. Its contents are not affec-
ted 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.
–
PTR bit =1: the
EVENt
bit is set.
–
PTR bit =0: the
EVENt
bit is not set.
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.
–
NTR bit =1: the
EVENt
bit is set.
–
NTR bit =0: the
EVENt
bit is not set.
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
Status reporting system
