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Command Syntax
3–2
VX4101A MultiPaq Instrument User Manual
H White space characters can be used to make a command string more
readable. These characters are ASCII-encoded bytes in the range hexadeci-
mal 00-09 and 0B-20 (decimal 0-9 and 11-32). This range includes the
ASCII control characters and the space, but excludes the line feed <NL>.
White space characters are ignored when legally encountered in a command
string. White space is allowed anywhere in a command string, except for the
following:
Within a program mnemonic (for example ROUTE )
Around a colon (:) mnemonic separator (for example ROUTE: CLOSE
or ROUTE :CLOSE)
Between a mnemonic and a (?) (for example CLOSE ?)
Following an asterisk (*) (for example * STB?)
Within a number (for example 12 34)
At least one white space character is required between a command/query
header and its associated arguments. For example in the command
route:configure:join m1,(1:6)
the command header is the string “route:configure:join”. The arguments
associated with this command are the module name “m1” and the section list
“(1:6)”. At least one white space character must be sent before the first
argument.
In the query
route:close? (@m1(1:64))
the query header is the string “route:close?”. The argument associated with
this query is the channel list “(@m1(1:64))”. At least one white space
character must be sent before the channel list argument.
H A SCPI command or query is composed of one or more keywords separated
by colons. A keyword can be sent in either short or long form. The short
form of a keyword is composed of capital letters in the command descrip-
tions. The long form is composed of all characters in the keyword. The
keywords in a command or query can be a combination of long and short
forms. Commands and queries are parsed in a case-independent manner
H Multiple data parameters passed by a command are separated by a comma (,)
H A question mark (?) following a command indicates that a response will be
returned. All responses from the VX4101A are terminated with a line feed
<LF> (hexadecimal 0A) character
H In the command descriptions, the following special characters are used.
Except for the colon (:), these characters are not part of the command and