SCPI Command Structure and Syntax R&S FSL
1300.2519.12 5.8 E-11
Responses to Queries
A query is defined for each setting command unless explicitly specified otherwise. It is formed by adding
a question mark to the associated setting command. According to SCPI, the responses to queries are
partly subject to stricter rules than in standard IEEE 488.2.
• The requested parameter is transmitted without header.
E
xample: INPut:COUPling?, Response: DC
• Maximum values, minimum values and all further quantities, which are requested via a special text
parameter are returned as numerical values.
Example: SENSe:FREQuency:STOP? MAX, Response: 3.5E9
• Numerical values are output without a unit. Physical quantities are referred to the basic units or to
the units set using the Unit command.
Example: SENSe:FREQuency:CENTer?, Response: 1E6 (for 1 MHz)
• Truth values <Boolean values> are returned as 0 (for OFF) and 1 (for ON).
Example: SENSe:BANDwidth:AUTO?, Response: 1 (for ON)
• Text (character data) is returned in a short form.
Example: SYSTem:COMMunicate:SERial:CONTrol:RTS?, Response STAN (for standard)
Parameters
Most commands require a parameter to be specified. The parameters 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.
Numerical values
Numerical 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 exponent must lie inside the value range –32000 to 32000. The exponent is
introduced by an "E" or "e". Entry of the exponent alone is not permissible. In the case of physical
quantities, the unit can be entered. Permissible unit prefixes are G (giga), MA (mega), MOHM and MHZ
are also permissible), K (kilo), M (milli), U (micro) and N (nano). It the unit is missing, the basic unit is
used.
Example: SENSe:FREQuency:STOP 1.5GHz = SENSe:FREQuency:STOP 1.5E9
Special numerical
The texts MINimum, MAXimum, DEFault, UP and DOWN are interpreted as valuesspecial numerical
values. In the case of a query, the numerical value is provided.
Example:
Setting command: SENSe:FREQuency:STOP MAXimum
Query: SENSe:FREQuency:STOP?, Response: 3.5E9
– MIN/MAX
MINimum and MAXimum denote the minimum and maximum value.
– DEF
DEFault denotes a preset value which has been stored in the EPROM. This value conforms to the
default setting, as it is called by the *RST command
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