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Chapter 5
4421A SCPI Commands
4421A Standard Commands for Programmable Instruments (SCPI) commands are used to control the 4421A over
Ethernet or RS-232 serial interface.
4421A SCPI Command Syntax
A command is made up of one or more keywords. Consecutive keywords are separated with colons (:). The keywords
are followed by a parameter.
Table 2 Optional Keywords and Parameters
Table 3 Command Syntax
Characters
Meaning
Example
[ ]
Square brackets indicate that the enclosed
keywords or parameters are optional when
composing the command. These implied
keywords or parameters will be executed
even if they are omitted.
MEASure[:SCALar][:POWer][:FORWard]:AVERa
ge?
Characters, Keywords, and Syntax
Example
Upper- case lettering indicates the minimum set of
characters required to execute the command. But,
each mode of the command must be in either short
form or the complete long form (no in between).
Example:
Correct:
:IDEN
:IDENtity
Incorrect:
:IDENti
SYSTem:IDENtity:FWRev?
SYST:IDEN:FWR? is the minimum requirement.
Lower- case lettering indicates the portion of the
command that is optional; it can either be included
with the upper- case portion of the command or
omitted. This is the flexible format principle called
forgiving listening. See
:IDENtity
Either :IDEN, :IDENtity, or :IDENTITY
is correct.
A colon must be placed between two command
mnemonics.
SYSTem:IDENtity:FWRev?
White space characters, such as <tab> and <space>,
are generally ignored as long as they do not occur
within or between keywords.
However, you must use white space to separate the
command from the parameter.
:POW er or MEASure :POWer :AVERage? are not
allowed.
A <space> between :AVERage? and 1 is
mandatory.
MEASure :POWer :AVERage? 1
Summary of Contents for SMK-3000 Series
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Page 38: ...RF Calibration Kit 28 Figure 13 Sensor Accuracy Vs Load VSWR...
