HP 53181A Programming Manual page 259

Commands Reference
*DDT <arbitrary block>
(Define Device Trigger Command)
*DDT <arbitrary block>
(Define Device Trigger Command)
Sets or queries the command that the device will execute when it receives the IEEE
488.1 Group Execute Trigger (GET) interface message (page 4- 42) or a *TRG
common command.
There are only three valid commands that the Counter will accept:
:INITiate[:IMMediate], :READ?, or :FETCh?; otherwise, error -224 is generated. If
a zero-length <arbitrary block> is specified as the parameter, the Counter will do
nothing when it receives a GET or *TRG command.
• Definite length block
Query Response
• The query response will be one of the following:
#14INIT
#15FETC?
#15READ?
#0
terminated with a new line and EOI.
• *RST: #14INIT
Comments
• When defining the device trigger to :FETCh? or :READ?, note that these
definitions do not allow the specification of a particular function. This lack of a
function specification results in each *DDT using the function specified/used by
the last :CONFigure, :FETCh, :READ, or :MEASure command, if possible.
4-101