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SCPI Command Format
The HP E1429 digitizer is programmed with SCPI commands. SCPI
commands are based on a hierarchical structure, also known as a tree
system. In this system, associated commands are grouped together under a
common node or root, thus, forming subtrees or subsystems. An example is
the digitizer’s ’ARM’ subsystem shown on the following page.
ARM
[:STARt | :SEQuence[1]]
:COUNt <
number
>
:DELay <
period
>
[:IMMediate] [no query]
:LEVel<
n
>
:NEGative <
voltage
>
:POSitive <
voltage
>
:SLOPe[<
n
>] <
edge
>
:SOURce[<
n
>] <
source
>
ARM is the root keyword of the command; :STARt|SEQuence1 is the
second level keyword; :COUNt, :DELay, ... are third level keywords, and so
on.
Keyword Separator A colon (:) always separates one command keyword from a lower level
command keyword as shown below:
ARM:LEV:NEG 2
Abbreviated
Commands
The command syntax shows most commands as a mixture of upper and
lower case letters. The upper case letters indicate the abbreviated spelling
for the command. For shorter program lines, send the abbreviated form. For
better program readability, you may want to send the entire command. The
digitizer will accept either the abbreviated form or the entire command.
For example, if a command’s syntax contains the keyword COUNt, then
COUN and COUNT are acceptable forms. Other forms of COUNt such as
COU will generate an error.
You can use upper or lower case letters. Therefore, COUNT, coun, or Coun
are all acceptable.
Chapter 4 Command Reference 179