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Model 2520 User’s Manual Remote Operations 10-13
Short-form rules
Use the following rules to determine the short-form version of any SCPI command:
• If the length of the command word is four letters or less, no short form version
exists. Example:
• :feed = :feed
These rules apply to command words that exceed four letters:
• If the fourth letter of the command word is a vowel (including “y”), delete it and all
the letters after it. Example:
• :immediate = :imm
• If the fourth letter of the command word is a consonant, retain it but drop all the
letters after it. Example:
• :format = :form
• If the command contains a question mark (?; query) or a non-optional number
included in the command word, you must include it in the short-form version.
Example:
• :delay? = :del?
• Command words or characters that are enclosed in brackets ([ ]) are optional and
need not be included in the program message.
NOTE For fastest response to commands, always use short forms.
Program messages
A program message is made up of one or more command words sent by the computer to
the instrument. Each common command is a three letter acronym preceded by an asterisk
(*). SCPI commands are categorized in the :STATus subsystem and are used to explain
how command words are structured to formulate program messages.
:STATus Path (Root)
:OPERation Path
:ENABle <NRf> Command and parameter
:ENABle? Query command
:PRESet Command
Single command messages
The above command structure has three levels. The first level is made up of the root com-
mand (:STATus) and serves as a path. The second level is made up of another path
(:OPERation) and a command (:PRESet). The third path is made up of one command for
the :OPERation path. The three commands in this structure can be executed by sending
three separate program messages as follows: