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
setting, the instrument will always return "0" or "1". The following example requires a Boolean parameter:
DISPlay:STATe {ON|1|OFF|0}
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 example 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 The following example with 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.
Different programming languages and IEEE-488 interface cards provide access to this capability through their own
unique commands. The status registers, the error queue, and all configuration states are left unchanged when a
Device 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.
l An overlapped command, if any, will be terminated with no "Operation Complete" indication (applies to INIT).
The ABORt command is the recommended method to terminate a measurement.
104 Agilent Truevolt Series DMM Operating and Service Guide
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