Command reference
R&S
®
ZNA
881
User Manual 1178.6462.02 ─ 20
7.1.1
Upper- vs. lower-case
Upper-/lower-case characters characterize the long and short form of the mnemonics
in a command. The short form consists of all uppercase characters, the long form of all
uppercase plus all lowercase characters. It is recommended to use either the short
form or the long form; mixed forms are not always recognized. The R&S
ZNA itself
does not distinguish uppercase and lowercase characters.
7.1.2
Special characters
The following special characters are frequently used in the command description:
●
|
A vertical stroke characterizes alternative parameter settings. Only one of the
parameters separated by | must be selected.
●
[ ]
Mnemonics in square brackets can be omitted when composing the command
header. The complete command must be recognized by the instrument for reasons
of compatibility with the SCPI standard. Parameters in square brackets are optional
as well. They may be used in some application contexts, omitted in others.
●
{ }
Braces or curly brackets enclose one or more parameters that may be included
zero or more times.
7.1.3
Parameters
Many commands are supplemented by a parameter or a list of parameters. Parame-
ters either provide alternative options (setting a or setting b or setting c ..., see special
character "|"), or they form a list separated by commas (setting x, y).
●
<Parameter1>, <Parameter2>...:
In the command tables and lists, parameters are
generally described by a name (Parameter1, Parameter2...) written in angle brack-
ets (<>). In an application program, <Parameter1>, <Parameter2>... must be
replaced by one of the possible settings reported in the detailed parameter descrip-
tion.
Example:
CONTrol:AUXiliary:C[:DATA] <DecValue>
with <DecValue> = 0 to 255
--> possible command syntax:
CONTrol:AUXiliary:C:DATA 1
●
NAN (Not A Number)
(as a returned value) is generally used to represent missing
data, e.g. if a portion of a trace has not been acquired yet. It is also returned after
invalid mathematical operations such as division by zero. As defined in the SCPI
standard, NAN is represented as 9.91 E 37.
●
INV (INValid)
is returned e.g. if a limit check is performed without defining the
appropriate tolerance values.
7.1.4
Numeric suffixes
Symbols in angular brackets (<Ch>, <Chn>, <Mk>...) are numeric suffixes. Numeric
suffixes are replaced by integer numbers to distinguish various items of the same type.
Special terms and notation
