Command Fundamentals; Common Command Format; Scpi Command Format - HP VXI 75000 C Series User's And Scpi Programming Manual

Algorithmic closed loop controller
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Command Fundamentals

Common
Command
Format
SCPI
Command
Format
Command
Separator
Abbreviated
Commands
158 HP E1415 Command Reference
Commands are separated into two types: IEEE-488.2 Common Commands and SCPI
Commands. The SCPI command set for the HP E1415 is 1990 compatible
The IEEE-488.2 standard defines the Common commands that perform functions
like reset, self-test, status byte query, etc. Common commands are four or five
characters in length, always begin with the asterisk character (*), and may include
one or more parameters. The command keyword is separated from the first parameter
by a space character. Some examples of Common commands are:
*RST
*ESR 32
*STB?
The SCPI commands perform functions like configuring channels, setting up the
trigger system, and querying instrument states or retrieving data. A subsystem
command structure is a hierarchical structure that usually consists of a top level (or
root) command, one or more lower level commands, and their parameters. The
following example shows part of a typical subsystem:
MEMory
:VME
:ADDRess < A24_address >
:ADDRess?
:SIZE < mem_size >
:SIZE?
MEMory is the root command, :VME is the second level command, and
:ADDRess, and SIZE are third level commands.
A colon (:) always separates one command from the next lower level command as
shown below:
ROUTE:SEQUENCE:DEFINE?
Colons separate the root command from the second level command
(ROUTE:SEQUENCE) and the second level from the third level
(SEQUENCE:DEFINE?). If parameters are present, the first is separated from the
command by a space character. Additional parameters are separated from each other
by a commas.
The command syntax shows most commands as a mixture of upper and lower case
letters. The upper case letters indicate the abbreviated spelling for the command. For
shorter program lines, send the abbreviated form. For better program readability,
send the entire command. The instrument will accept either the abbreviated form or
the entire command.
For example, if the command syntax shows SEQuence, then SEQ and
SEQUENCE are both acceptable forms. Other forms of SEQuence, such as
SEQUEN or SEQU will generate an error. You may use upper or lower case letters.
Therefore, SEQUENCE, sequence, and SeQuEnCe are all acceptable.
Chapter 6

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