Ceyear 4051 Series, Руководство пользователя

Страница: 628 / 751

6 Remote control
6.1 Basis of Remote Control
614
—
General command: the function and grammar are defined in the IEEE488.2 standard, and this kind of
command is suitable for all kinds of instruments, and if possible, used for standard status register
management, resetting, automatic testing, etc.
—
Instrument control command: a kind of instrument characteristic command, used to realize the instrument
functions. Example: frequency setting. The grammar should comply with the SCPI specifications.
b) Instrument response
The instrument response (response message and service request) is a kind of query result message transmitted
by the instrument to the computer. This kind of message includes the measurement result, instrument status,
etc.
6.1.3 SCPI Command
 SCPI Command Introduction
„„„„„„„„„„„„„„„„„„„„„„„„„„„„
614
 SCPI Command Specifications „„„„„„„„„„„„„„„„„„„„„„„„„„„
615
6.1.3.1 SCPI Command Introduction
SCPI (Standard Commands for Programmable Instruments) is a command set, which is established based on
the IEEE488.2 Standard and suitable for all instrument. It mainly aims to apply the same programmed
commands for the same functions to realize the universality of programmed commands.
The SCPI command is composed of the command head and one or more parameter(s), which are separated by
spaces. The command head includes one or more key field(s). The command with the suffix question mark is
the query command. The command can be divided into general command and special command of different
grammatical structures. The SCPI command has the following features:
1) Programmed commands are applicable to the test function, but not for instrument description.
2) Programmed commands can help to reduce the repetition of similar test functions and ensure the program
compatibility.
3) Programmed messages are defined in the layer which is not related to the hardware of the physical layer in
communication.
4) Programmed messages are not related to the programming method and language. The SCPI test program
is easy to transplant.
5) Programmed commands are scalable to adapt to measurement control of various scales.
6) The extendibility of SCPI enables it to be ―live‖ standard.
For more SCPI details, refer to:
 IEEE Standard 488.1-1987, IEEE Standard Digital Interface for Programmable Instrumentation. New
York, NY, 1998.
 IEEE Standard 488.2-1987, IEEE Standard Codes, Formats, Protocols and Comment Commands for Use
with ANSI/IEEE Std488.1-1987. NewYork, NY, 1998.
 Standard Commands for Programmable Instruments(SCPI) VERSION 1999.0.
For details of the remote command set, classification and specifications of 4051 series signal/spectrum
analyzer, refer to:
1) ―Appendix B SCPI Command Index‖ of this Manual.
2) ―3 Remote Control Commands‖ of the Remote Control Manual.
3) ―Appendix A SCPI Command Tree of Section 6.1‖ of the Remote Control Manual.
4) ―Appendix B Table of Subsystem-based ASCPI Classification of Section 6.2‖ of the Remote Control
Manual.