Introduction to the SCPI Language
letters. Query responses will always return the short form in all upper-case letters. The following command requires a
discrete parameter for the voltage units:
[SOURce[1|2]:]VOLTage:UNIT {VPP|VRMS|DBM}
Boolean Parameters
Boolean parameters represent a single binary condition that is either true or false. For a false condition, the instrument
will accept "OFF" or "0". For a true condition, the instrument will accept "ON" or "1". When you query a boolean set-
ting, theinstrument will always return "0" or "1". The following command requires a boolean parameter:
DISPlay {OFF|0|ON|1}
ASCII String Parameters
String parameters can contain virtually any set of ASCII characters. A string must begin and end with matching
quotes; either with a single quote or a double quote. You can include the quote delimiter as part of the string by typing
it twice without any characters in between. The following command uses a string parameter:
DISPlay:TEXT <quoted string>
For example, the following command displays the message "WAITING..." on the instrument's front panel (the quotes
are not displayed).
DISP:TEXT "WAITING..."
You can also display the same message using single quotes.
DISP:TEXT 'WAITING...'
Using Device Clear
Device Clear is an IEEE-488 low-level bus message that you can use to return the instrument to a responsive state. Dif-
ferent programming languages and IEEE-488 interface cards provide access to this capability through their own unique
commands. The status registers, theerror queue, and all configuration states are left unchanged when aDevice Clear
message is received.
Device Clear performs the following actions:
l If a measurement is in progress, it is aborted.
l The instrument returns to the trigger "idle" state.
l The instrument's input and output buffers are cleared.
l The instrument is prepared to accept a new command string.
The ABORt command is the recommended method to terminate an instrument operation.
154 Agilent 33500 Series Operating and Service Guide
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