58542 VXIbus Universal Power Meter
2-12
Publication 21555, Rev. E, September 2002
2.5.11
GPIB Command Syntax
The following conventions are used with the GPIB commands in this publication. Some commands will
be in both upper- and lower-case, such as CALCulate and MEMory. The uppercase is the required input.
The whole word can be used if desired. Table 2-2 lists in alphabetical order all of the GPIB commands
supported by the power meter. The basic function performed by that command is given and the page
number in this chapter where a description of each command can be located. Most query command
syntaxes have been provided on the description page, not in Table 2-2.
2.5.11.1
Commands in Brackets
Commands and command separators within brackets, such as [COMMand:], are optional. These
portions of the commands may be used in the program command strings, but are not required for proper
operation of the power meter.
2.5.11.2
Programmer Selective Parameters
Command descriptions enclosed in angle brackets (< and >) show the syntax placement of configurable
parameters. A description of the necessary parameter and the range of values or mnemonics valid for
that parameter are enclosed in angle brackets.
2.5.11.3
Italics in Syntax Descriptions
Some command syntax descriptions show certain words in italics such as
space
and
comma
to indicate
where the character must be included within a command string.
2.5.11.4
Query Format
Except where specifically noted, all query commands are formed by adding a question mark (?) to the
command header. Be sure to omit command parameters when using the query format. Some commands
have only a query format. With the exception of the Calibration queries, query commands will not
change the status of the power meter. The CALibration1? and CALibration1:ZERO? commands query
respectively to automatically begin the calibration and zeroing process.
2.5.11.5
Linking Command Strings
The 58542 uses ASCII strings for commands. When sending more than one command in a single string,
a semicolon must be used as a delimiter between commands. No spaces or other characters are necessary.
Use only a semicolon to link commands in a string.
2.5.11.6
Measurement Data Output Format
The examples in this chapter are written in HTBasic™ format. Different languages will use different
commands, but the string sent or received will always be the same. In HTBasic, the OUTPUT
command sends a string to the GPIB bus. The number or variable after the word OUTPUT is the GPIB
address of the power meter.
™HTBasic is a trademark of TransEra Corporation.
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