R&S NRP18S Series User Manual page 137

®
R&S NRP18S-xx
significant bit, is set to 0 in all registers, thus preventing problems some controllers
have with the processing of unsigned integers.
Figure 10-2: Standard SCPI status register
CONDition status register part
The five parts of a SCPI register have different properties and functions:
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 status register part
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.
User Manual 1178.3686.02 ─ 05
Remote Control Basics
Status Reporting System
137