Chapter 7 SCPI
Syntax and notation
216 WCDMA Options Version 6.20
Compound commands Compound commands are always referred to as commands throughout this
chapter.
– Any compound command is built in a hierarchical way. The single command
elements are separated by colons (:).
– A command usually starts with a colon (:). However, the colon must be
omitted when the subsequent command continues on the same hierarchical
level (see examples below).
– The first command element always is the name of the subsystem like
CONFigure or MEASure.
– Then follows one of the commands available for that subsystem like
GSM or
RFTX.
– The subsequent command element(s) may now be one or more subcom-
mand(s) and/or one or more parameter term(s) (e.g.
BS:ID:BCC 5).
– A SCPI program line may contain more than one command. In this case, the
single commands have to be separated by a semicolon (;).
– There is also a short form for every command. This is usually formed of the
first four letters (
CONF instead of CONFIGURE). When the fourth letter is a
vowel (a,e,i,o,u), only the first three letters are used (
RFG instead of RFGen-
erator
).
– Throughout this manual, the short form is always written in capitals to make
it easy to identify it. However, the SCPI system of the 4400 is not case-
sensitive.
Examples
– The complete SCPI command to set the base station color code (i.e. the
training sequence) to 5 would be:
:CONFigure:GSM:BS:ID:BCC 5. The
short form
:CONF:GSM:BS:ID:BCC 5 is completely identical.
–
:RFGenerator:STATe ON is identical with :RFG:STAT ON. However,
the long version of the commands is – especially in the beginning – easier to
work with.
–
:RFGenerator:STATe ON; LEVel 20 is a valid two-command state-
ment.
STATe ON and LEVel are both commands of the RFGenerator
subsystem. Both are working on the same hierarchical level. Therefore, the
colon in front of
LEVel 20 has to be omitted.
An alternative with the identical meaning would be:
:RFGener-
ator:STATe ON; :RFGenerator:LEVel 20
. The form :RFGener-
ator:STATe ON; :LEVel 20
would be invalid, because LEVel is no
subsystem of the 4400.
–
:RFGenerator:MODulation:STATe ON is invalid. STATe ON is no
subcommand of the
:RFG:MOD level.
–
:RFGenerator:MODulation ON; FREQuency 850.2 In this case, the
first part up to the semicolon(;) is valid. The second part is invalid as
FREQ is
no subcommand of the
:RFG:MOD level.
The correct command would be:
:RFGenerator:MODulation ON;
:RFGenerator:FREQuency 850.2
.
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