Rohde & Schwarz R&S FSL3 - Page 715

SCPI Command Structure and Syntax R&S FSL
1300.2519.12 5.6 E-11
SENSe
BANDwidth FUNCtion
FREQuency
S
TOP
CENTer
S
PAN OFFSet
S
TARt
D
ETector
Fig. 5–1 Tree structure the SCPI command systems using the SENSe system as example
• Multiple key words
Some key words occur in several levels within one command system. Their effect depends on the
structure of the command, i.e. at which position in the header of a command they are inserted.
Example: SOURce:FM:POLarity NORMal
This command contains key word POLarity in the third command level. It defines the polarity
between modulator and modulation signal.
Example: SOURce:FM:EXTernal:POLarity NORMal
This command contains key word POLarity in the fourth command level. It defines the polarity
between modulation voltage and the resulting direction of the modulation only for the external signal
source indicated.
• Optional key words
Some command systems permit certain key words to be inserted into the header or omitted. These
key words are marked by square brackets in the description. The full command length must be
recognized by the instrument for reasons of compatibility with the SCPI standard. Some commands
are considerably shortened by these optional key words.
Example: [SENSe]:BANDwidth[:RESolution]:AUTO
This command couples the resolution bandwidth of the instrument to other parameters. The
following command has the same effect: BANDwidth:AUTO
Note: An optional key word must not be omitted if its effect is specified in detail by a numeric suffix.
• Long and short form
The key words feature a long form and a short form. Either the short form or the long form can be
entered, other abbreviations are not permitted.
Example: STATus:QUEStionable:ENABle 1= STAT:QUES:ENAB 1
Note: Upper–case and lower–case notation only serves to distinguish the two forms in the manual, the
instrument itself does not distinguish upper–case and lower–case letters.
• Parameter
The parameter must be separated from the header by a "white space". If several parameters are
specified in a command, they are separated by a comma ",". A few queries permit the parameters
MINimum, MAXimum and DEFault to be entered. For a description of the types of parameter, refer
to section "Parameters".
Example: SENSe:FREQuency:STOP? MAXimum, Response: 3.5E9
This query requests the maximal value for the stop frequency.