prog.book : chapter1.fm 95 Mon Feb 15 09:24:37 1999
Power Meter Remote Operation
An Introduction to the SCPI Language
HP E4418B/E4419B Programming Guide 1-95
Syntax Conventions
Throughout this guide, the following conventions are used for SCPI
command syntax.
• Square brackets ([]) indicate optional keywords or parameters.
• Braces ({}) enclose one or more parameters that may be included
zero or more times.
• Triangle brackets (<>) indicate that you must substitute a value
for the enclosed parameter.
• Bars (|) can be read as “or” and are used to separate alternative
parameter options.
Syntax Diagram Conventions
• Solid lines represent the recommended path.
• Ovals enclose command mnemonics. The command mnemonic
must be entered exactly as shown.
• Dotted lines indicate an optional path for bypassing secondary
keywords.
• Arrows and curved intersections indicate command path direction.
SCPI Data Types
The SCPI language defines different data formats for use in program
messages and response messages. Instruments are flexible listeners and
can accept commands and parameters in various formats. However, SCPI
instruments are precise talkers. This means that SCPI instruments
always respond to a particular query in a predefined, rigid format.
<Boolean> Definition
Throughout this chapter <Boolean> is used to represent ON|OFF|<NRf>.
Boolean parameters have a value of 0 or 1 and are unitless. ON
corresponds to 1 and OFF corresponds to 0.
On input, an <NRf> is rounded to an integer. A nonzero result is
interpreted as 1.
Queries always return a 1 or 0, never ON or OFF.
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