There is only one route to travel to reach the destination keyword
or
parameter on the
selected branch. More than one command may have the same keyword, but on different
branches.
These
commands
usually
perform
a similar function
in
the
respective
branches, however, each can only be reached by traversing a unique path.
raot
FREQuency
~
ROSCiliaror
1
SOURce
Figure 5-2. Same Keywords in Different Subsystems
The command hierarcby can also be represented by a Command Table
and
by
Syntax
Diagrams.
An
example
of
each method is illustrated.
5.2.1
Parameters
The parameter specifies the finest detail tbat is required
in
a branch.
Most
parameters
have a defined default value
at
power-up
or
*RST.
Parameter defaults are specified in
the manual for each instrument. There are three major types
of
parameters: Character
(Discrete), Decimal Numeric, and Boolean.
Character
parameters are a one word character label, usually one
of
a number choices,
that defines a characteristic (e.g. ZCROs the abbreviation for Zero Crossings). Failure
ta
include a numerical suffix with a Character parameter requiring one, will result
in
issuing a command with the lowest value suffix (e.g. the command
TIL
Trg without any
suffix will default
to
TIL
TrgO).
Decimal Numeric has an extended setthat may be implemented. Decimal Numeric may
not be used as a subset (e.g. 1
ofn
lines), butmay be used as a value definition
(e.g.
start
value
=10). Subsets are implemented
by
using a suffix with a discrete (e.g. Line2).
Decimal Numericalso covers the "label" type
of
parameter, the signal name (e.g.
SINl).
The extended numeric set covers the special numbers MAXimum and MINimum which
are required and DEFault which is optional.
Remote Operation 5-3
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