Keysight P9241, Руководство программиста SCPI

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1198 Keysight P9241/42/43A Oscilloscopes SCPI Programmer's Guide
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More About Oscilloscope Commands
not you have included the question mark. The command and query forms of an
instruction usually have different program data. Many queries do not use any
program data.
There are three types of headers:
•
"Simple Command Headers" on page 1199
• "Compound Command Headers" on page 1199
• "Common Command Headers" on page 1199
White Space
(Separator)
White space is used to separate the instruction header from the program data. If
the instruction does not require any program data parameters, you do not need to
include any white space. White space is defined as one or more space characters.
ASCII defines a space to be character 32 (in decimal).
Program Data Program data are used to clarify the meaning of the command or query. They
provide necessary information, such as whether a function should be on or off, or
which waveform is to be displayed. Each instruction's syntax definition shows the
program data, as well as the values they accept. "Program Data Syntax Rules" on
page 1200 describes all of the general rules about acceptable values.
When there is more than one data parameter, they are separated by commas(,).
Spaces can be added around the commas to improve readability.
Program Message
Terminator
The program instructions within a data message are executed after the program
message terminator is received. The terminator may be either an NL (New Line)
character, an EOI (End-Or-Identify) asserted in the programming interface, or a
combination of the two. Asserting the EOI sets the EOI control line low on the last
byte of the data message. The NL character is an ASCII linefeed (decimal 10).
Long Form to Short Form Truncation Rules
To get the short form of a command/keyword:
• When the command/keyword is longer than four characters, use the first four
characters of the command/keyword unless the fourth character is a vowel;
when the fourth character is a vowel, use the first three characters of the
command/keyword.
• When the command/keyword is four or fewer characters, use all of the
characters.
NOTE
New Line Terminator Functions . The NL (New Line) terminator has the same function as an
EOS (End Of String) and EOT (End Of Text) terminator.
Long Form Short form
RANGe RANG
PATTern PATT