5
System Commands
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:=
A colon followed by an equals sign separates a placeholder
from the description of the type and range of values that may
be used in a command instead of the placeholder.
{ } Braces enclose a list of choices from which one must be se-
lected.
[ ] Square brackets enclose optional items.
... An ellipsis indicates that the items to the left and to the right
of the ellipsis may be repeated zero or more times.
As an example, consider the syntax notation for the command to
set the vertical input sensitivity:
<channel>:VOLT_DIV <v_gain>
<channel> := {C1, C2}
<v_gain> := 5.0 mV to 2.5 V
The first line shows the formal appearance of the command with
<channel> denoting the placeholder for the header path, and
<v_gain> denoting the placeholder for the data parameter specify-
ing the desired vertical gain value. The second line indicates that
either "CI" or "C2" must be chosen for the header path, and the
third line explains that the actual vertical gain can be set to any
value between 5 mV and 2.5 V.
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