IEEE-488 Reference
5-32
:open = :open
:line = :line
B. The following rules apply to command words that exceed four letters:
a. If the fourth letter of the command word is a vowel, delete it and all the
letters after it. Examples:
:immediate = :imm
:timer = :tim
b. If the fourth letter of the command word is a consonant, retain it but drop
all the letters after it. Examples:
:output = :outp
:asynchronous = :asyn
C. If there is a question mark (?; query) or a non-optional number included in the
command word, it must be included in the short-form version. Examples:
:delay? = :del?
:layer2 = :lay2
D. As previously explained, command words or characters that are enclosed in
brackets ([]) are optional and need not be included in the program message.
Example:
:STATus:OPERation[:EVENt]?
The brackets ([]) indicate that :EVENt is optional. Thus, either of the follow-
ing two command program messages are valid:
:STATus:OPERation:EVENt? = :STATus:OPERation?
Notice that when using the optional word or character, the brackets ([]) are not
included in the program message.
The complete short-form version of the above command is as follows:
:stat:oper?
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 simply a three letter acronym preceded
by an asterisk (*). SCPI commands are categorized into subsystems and are structured
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