prog.book : ch15ieee.fm 8 Mon Feb 15 09:24:37 1999
IEEE488.2 Command Reference
*DDT <arbitrary block program data>|<string program data>
15-8 HP E4418B/E4419B Programming Guide
*DDT <arbitrary block program data>|<string program data>
The *DDT (Define Device Trigger) command determines the power meter’s
response to a GET (Group Execute Trigger) message or *TRG common
command. This command effectively turns GET and *TRG into queries,
with the measured power being returned.
Syntax
Parameters
Examples of <arbitrary block program data> parameters are:
• #15FETC? and #206FETCh?
Examples of <string program data> are:
• "FETCh1?", "FETCh?" and "TRIG1;FETC1"
Reset Condition
On reset, the <action> field of *DDT is set to *TRG.
1. The <action> field of the parameter may contain:
• FETC?
• FETC1?
• FETC2? (HP E4419B only)
• *TRG
• TRIG1
• TRIG2 (HP E4419B only)
2. The first digit after the # indicates the number of following digits. The following
digits indicate the length of the data.
Type Description Range of Values
arbitrary block program
data
The command which is
executed on a GET or
*TRG.
#nN<action>
1,2
string program data
“<action>”
1
string program data
*DDT
Space
arbitrary block program data
?
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