R&S NRPxxS Series User Manual page 164

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R&S NRPxxS(N)
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 status register part
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.
You can only read this part. Reading the register clears it. This part is often equated
with the entire register.
ENABle status register part
The ENABle part determines whether the associated EVENt bit contributes to the sum
bit (see below). Each bit of the EVENt part is "ANDed" with the associated ENABle bit
(symbol '&'). The results of all logical operations of this part are passed on to the sum
bit via an "OR" function (symbol '+').
ENABle bit = 0: The associated EVENt bit does not contribute to the sum bit.
ENABle bit = 1: If the associated EVENt bit is 1, the sum bit is set to 1 as well.
You can read and write as required. Its contents are not affected by reading.
Sum bit
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
can lead to a service request throughout all levels of the hierarchy.
11.3.3 Status Byte (STB) and Service Request Enable Register (SRE)
The status byte register is already defined in IEEE 488.2. It gives a rough overview of
the sensors status, collecting information from the lower-level registers. It is compara-
User Manual 1177.5079.02 ─ 10
Remote Control Basics
Status Reporting System
164