Rohde & Schwarz NRT 1080.9506.02/.62, Operating Manual

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NRT Status Reporting System
1080.9506.02 3.51 E-6
CONDition part The CONDition part is directly written into by the hardware or the sum bit of
the next lower register. Its contents reflects the current instrument status. This
register part can only be read, but not written into or cleared. Its contents is
not affected by reading.
PTRansition part The Positive-TRansition part acts as an edge detector. 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 at will. Its contents is not affected by
reading.
NTRansition part The Negative-TRansition part also acts as an edge detector. 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 at will. Its contents is not affected by
reading.
With these two edge register parts the user can define which state transition
of the condition part (none, 0 to 1, 1 to 0 or both) is stored in the EVENt part.
EVENt part The EVENt part indicates whether an event has occurred since the last read-
ing, it is the "memory" of the condition part. It only indicates events passed on
by the edge filters. It is permanently updated by the instrument. This part can
only be read by the user. Upon reading, its contents is set to zero. In colloquial
language, this part is often equated with the entire register.
ENABle part The ENABle part determines whether the associated EVENt bit contributes to
the sum bit (cf. below). Each bit of the EVENt part is ANDed with the associ-
ated ENABle bit (symbol ’&’). The results of all logical operations of this part
are passed on to the sum bit via an OR function (symbol ’+’).
ENAB bit =0: the associated EVENt bit does not contribute to the sum bit
ENAB bit =1: if the associated EVENT bit is "1", the sum bit is set to "1" as
well.
This part can be written into and read by the user at will. Its contents is not
affected by reading.
Sum bit As indicated above, the sum bit is obtained from the EVENt and ENABle part
for each register. The result is then entered into a bit of the CONDition part of
the higher-order register.
The instrument automatically generates the sum bit for each register. Thus an
event, e.g. a PLL that has not locked, can lead to a service request throughout
all levels of the hierarchy.
Note: The service request enable register SRE defined in IEEE 488.2 can be taken
as ENABle part of the STB if the STB is structured according to SCPI. By
analogy, the ESE can be taken as the ENABle part of the ESR.
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