COMMAND OVERVIEW
13
COMMAND OVERVIEW
The Command overview chapter lists all the PEL-
2000 commands and command queries .The
command syntax section shows you the basic rules
you have to apply when using commands.
Command Syntax
Compatible
standard
IEEE488.2, 1992 (fully compatible)
SCPI, 1994 (partially compatible)
Command types
There are a number of different instrument
commands and queries. A command sends
instructions or data to the electronic load and a
query receives data or status information from the
electronic load.
Command Types
Simple
A single command with/without
a parameter
Example *OPC
Compound
Two or more commands
separated by a colon (:)
with/without a parameter
Example UTILITY:SOUND 1
Query
A query is a simple or compound
command followed by a question
mark (?). A parameter (data) is
returned.
Example UTILITY:SOUND?
PEL-2000 Programming Manual
14
Command forms
Commands and queries have two different forms,
long and short. The command syntax is written
with the short form of the command in capitals
and the remainder (long form) in lower case.
Short
FETCh:VOLTage?
Short
Long
The commands can be written in capitals or lower-
case, just so long as the short or long forms are
complete. An incomplete command will not be
recognized.
Below are examples of correctly written
commands.
LONG FETCh:VOLTage?
FETCH:VOTAGE?
fetch:voltage?
SHORT FETC:VOLT?
fetc:volt?
Square Brackets
Commands that contain squares brackets indicate
that the contents are optional. The function of the
command is the same with or without the square
bracketed items, as shown below.
Example:
:LOAD[:STATe]
= :LOAD:STATe
= :LOAD
Command format
1: command header
2: single space
3: parameter
4: message terminator
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