R&S SMC100A SCPI Command Structure and Syntax
1411.4060.32 5.12 E-1
Multiple key words
Some key words occur on several levels within one command system. Their
effect depends on the structure of the command, i. e. on the position in the
command header they are inserted in.
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.
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 optionally inserted
into the header or omitted. These key words are marked by square brackets
in this manual. The full command length must be recognized by the
instrument for reasons of compatibility with the SCPI standard. Some
commands are considerably shortened by omitting optional key words.
Example:
[SOURce]:POWer[:LEVel][:IMMediate]:Offset 1
This command immediately sets the offset of the signal to 1 dB. The following
command has the same effect:
POWer:Offset 1
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.
Parameters:
Parameters 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: SOURce:POWer:ATTenuation? MAXimum Answer: 60
his query requests the maximal value for the attenuation.
Numeric suffix:
If a device features several functions or features of the same kind, e.g.
several inputs, the desired function can be selected by a suffix added to the
command. Entries without suffix are interpreted like entries with the suffix 1.
Optional keywords must be specified if they select a function with the suffix.
Example:
SOURce:LFOutput2:FREQuency 1.5kHz
This command sets the frequency of secondLF generator frame.
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