Remote Control
R&S
®
ZNC
340
User Manual 1173.9557.02 ─ 13
5.2.3 SCPI Parameters
Many commands are supplemented by a parameter or a list of parameters. The param-
eters must be separated from the header by a "white space". Permissible parameters are
numerical values, Boolean parameters, text, character strings and block data. The type
of parameter required for the respective command and the permissible range of values
are specified in the command description.
5.2.3.1
Numeric Values
Numeric values can be entered in any form, i.e. with sign, decimal point and exponent.
Values exceeding the resolution of the instrument are rounded up or down. The mantissa
may comprise up to 255 characters, the values must be in the value range –9.9E37 to
9.9E37. The exponent is introduced by an E or e. Entry of the exponent alone is not
allowed. In the case of physical quantities, the unit can be entered. Permissible unit pre-
fixes are G (giga), MA (mega), MOHM and MHZ are also permissible), K (kilo), M (milli),
U (micro) and N (nano). If the unit is missing, the default unit is used.
Example:
SOUR:RFG:FREQ 1.5GHz
is equivalent to
SOUR:RFG:FREQ 1.5E9
Special numeric values
The texts
MINimum
,
MAXimum
,
DEFault
,
UP
and
DOWN
are interpreted as special
numeric values. A query returns the associated numerical value.
Example:
Setting command:
SENSe:FREQuency:STARt MINimum
The query
SENSe:FREQuency:STARt?
returns
300000
(the exact value depends on
the analyzer model).
The following special values can be used:
●
MIN/MAX
MINimum
and
MAXimum
denote the minimum and maximum value of a
range of numeric values.
●
DEF
DEFault
denotes the preset value. This value is set by the
*RST
command.
●
UP/DOWN
UP
,
DOWN
increases or reduces the numeric value by one step. The step
width is reported in the detailed command description.
●
INF/NINF
Negative
INFinity
(
NINF
) represent the numerical values –9.9E37 or
+9.9E37, respectively.
INF
and
NINF
are only sent as device responses.
●
NAN
Not a Number (
NAN
) represents the value 9.91E37.
NAN
is only sent as device
response. This value is not defined. Possible causes are division by zero, subtraction
or addition of infinite and the representation of missing values.
Unless it is explicitly stated in the command description you can use the special numeric
parameters for all commands of the analyzer.
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