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Chapter 3 Commands Summary
Overview of Command Type and Format
• All commands must be entered in the upper case.
• There are two types of the 3801-50, 3802-50 programming
commands: IEEE 488 common commands and Standard
Commands for Programmable Instruments (SCPI).
• Some commands are device-specific to the 3801-50, 3802-50. They
are not included in the version 1999.0 of the SCPI standard.
However, these commands are designed with the SCPI format in
mind and they follow the syntax rules of the standard.
Common Command Format
• The IEEE 488 standard defines the common commands as
commands that perform functions like reset and system query.
• Common commands usually come with the asterisk "∗" character,
and may include parameters. Some examples of Common
command like: *IDN?, *RST, *CLS, GTL, LLO.
SCPI Command Format and Query Format
• The SCPI commands control instrument functions.
• A subsystem command has a hierarchical structure that usually
consists of a top-level (or root) keyword, one or more lower level
keywords, and parameters.
• The following example shows a command and its associated query:
Commands
Summary Chapter 3
A. CONFigure:VOLTage:DC 0.5 : Set the main display to the DC
voltage measurement , and
select the 510.00mV range.
B. CONFigure? : Return the function of the main
display measurement.
• CONFigure is a root level keyword with the second level
keyword, VOLTage, and 0.5 is the command parameter.
• The query command ends with a question mark "?".
SCPI stems from IEEE488.1 and IEEE 488.2. Although the IEEE
488.2 standard addressed some instrument measurements, it
principally dealt with common commands and syntax or data formats.
Please refer to the IEEE488.2 and SCPI reference manual for more
information.
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