Remote Control - Commands
R&S NRP
1144.1400.12 6.12
E-3
FETCh:...?
The last valid result is returned. The command is only completed after a valid
measurement has been performed. When BUS is set as the trigger source, a
measurement cannot be started after the
FETCh
command and an SCPI error is
output (-214, Trigger deadlock).
In compliance with SCPI 1999.0, different results can be queried with
FETCh
without having to restart a measurement. This is only possible if the SENSe block is
not reconfigured. This is the case if only the calculation function (e.g.
:RATio:RELative
) changes. In all other cases, an SCPI error (-221, Setting
conflict) is returned and the command aborted.
READ:...?
A measurement is started without further configuration and the measurement result
is returned. The parameter list is compared to the current settings before the
measurement is started. If the list does not agree, an SCPI error (-221, Setting
conflict) is returned and the command aborted. Apart from this check,
READ
corresponds to the program message
INIT:IMM; FETCh[1..8]:...?
MEASure:...?
Combines
CONFigure
and
READ.
FETCh?
The
FETCh?
command without parameters has a special meaning. While
suppressing parameters normally means that default values are used and checked,
the current measured value under
FETCh?
is supplied when it is valid. If a
measured value is not yet available, processing is suspended until a valid result is
available.
READ?
Can be compared with
FETCh?
.
READ?;
starts a measurement and returns a
measured value without checking the current settings.
C O N F i g u r e
I N I T
F E T C h ?
C O N F i g u r e
R E A D ?
M E A S u r e ?
Fig. 6-4: Relationship between the commands
CONFigure
,
READ?
,
FETCh?
and
MEASure?
