Remote Control Basics
R&S
®
NRPxxS(N)
164
User Manual 1177.5079.02 ─ 10
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-
Status Reporting System
