Remote Control
R&S
®
CMW500
130User Manual 1173.9463.02 ─ 06
5.2.4.5 SCPI Parameters
Most commands require one or more parameters to specify their function. The parame-
ters must be separated from the header by a "white space". Permissible parameters are
numeric values, boolean parameters, text, character strings and block data. The param-
eter types and the permissible ranges of values are specified in the command description.
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 omitted, the default unit is used.
Example:
SOURce:GPRF:GENerator:RFSettings:FREQuency 1.5GHz is equivalent to
SOURce:GPRF:GENerator:RFSettings:FREQuency 1.5E9
Special numeric values
The texts MINimum, MAXimum, DEFault and KEEP are interpreted as special numeric
values. A query returns the associated numerical value.
Example:
SOURce:GPRF:GENerator:RFSettings:FREQuency MINimum
The query SOURce:GPRF:GENerator:RFSettings:FREQuency? returns
70000000.
The following special values can be used on the R&S CMW500:
●
MIN/MAX: denote the minimum and maximum value of a range of numeric values.
●
DEF: denotes the reset value. This value is set by the *RST command.
●
KEEP: can be used within a list of values to "keep" a value unchanged, e.g. to set
the third value in a list of five parameters to 10 use KEEP,KEEP,10,KEEP,KEEP
●
NAN: represents the value 9.91E37. Not a Number (NAN) is only sent as device
response. This value is not defined. Possible causes are division by zero, subtraction
or addition of infinite values, or missing values.
Unless it is explicitly stated in the command description you can use the special numeric
parameters described above for all commands of the R&S CMW500. Other special
parameters are generally not supported.
Boolean Parameters
Boolean parameters represent two states. The ON state (logically true) is represented
by ON. The OFF state (logically false) is represented by OFF. Replacement of ON or
OFF by 1 or 0 is not supported.
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