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Model 6487 Reference Manual
These rules apply to command words that exceed four letters:
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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 (*). The following SCPI commands from the STATus subsystem are used to help
explain how command words are structured to formulate program messages.
Command structure
:STATus
:OPERation
:ENABle <NRf>
:ENABle?
:PRESet
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:
:stat:oper:enab <NRf>
:stat:oper:enab?
:stat:pres
In each of the above program messages, the path pointer starts at the root command (:stat)
and moves down the command levels until the command is executed.
If the fourth letter of the command word is a vowel, delete it and all letters after it.
immediate = :imm
If the fourth letter of the command word is a consonant, retain it but drop all the
letters after it.
:format = :form
If the command contains a question mark (?) or a non-optional number included in
the command word, you must include it in the short-form version.
:delay? = :del?
Command words or characters that are enclosed in brackets ([ ]) are optional and need
not be included in the program message.
Path (Root)
Path
Command
Command and parameter
Query command
Remote Operation
9-13
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