Chapter 7 SCPI
Overview
214 WCDMA Options Version 6.20
Overview
SCPI (pronounced as ‘skippy’) is a world-wide standard. The basic idea of SCPI is
to define a command language for measurement systems that is independent of
the related manufacturers.
This chapter explains how SCPI works on the 4400. It is divided into six subsec-
tions:
What SCPI is – Here you will find a short definition of SCPI and some general
information.
Structure – This subsection explains the common commands, the subsystems and
the command tree.
Syntax and notation – The command syntax, the parameters and the syntax of
queries are explained in this subsection.
SCPI and RAPID! – SCPI and RAPID! together form a powerful time-saver for
extensive tests that are performed on a regular basis, like automated acceptance
tests after manufacturing or regular routine checks as part of maintenance or
quality assurance.
Command subsystem overview – This subsection gives a brief overview on the
subsystems into which the SCPI commands are split.
The Node B and UE parameter subsystems
The communication-related subsystems
SCPI command errors – Here, you will find a table with explanations of syntax
errors, run-time errors, device errors or any other errors.
What SCPI is
SCPI (Standard Commands for Programmable Instruments) was introduced in
1990. It is a world-wide standard, independent of single manufacturers.
The SCPI specifications define a command language for measurement systems
and – in principle – are based on IEEE 488.2.
SCPI is independent of the physical transmission channel of the commands.
Although this chapter refers to the GPIB as the physical interface, you can also
control the 4400 via a local area network (TCP/IP Option required).
The idea behind SCPI is to shorten program development times for the auto-
mated control of test equipment and to make that program development as effi-
cient as possible.
Of course, one of the main requirements for this goal is that the language must
be understood by as many measurement devices as possible. Therefore, SCPI is
pushed by the SCPI consortium. Quite a number of the main test and measure-
ment equipment manufacturers are members of the SCPI consortium.
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