14
6
Structure of COM Objects
COM server contains several
objects
, which provide different functionality of the
server. The COM objects of the network analyzer executable module are organized
in a hierarchical structure. Figure 3 shows the main COM objects, which comprise
the first three levels of the hierarchical structure of the COM server. COM objects
provide various
methods
and
properties
, which allow access to the server functions;
besides, they allow access to the objects of the lower levels, which are not shown
in Figure 3.
Figure 3. The structure of COM objects
The Object Application is in the top of the hierarchy COM server. Access to the
lower level objects is implemented via higher level objects.
Note
The hierarchy of COM objects is organized in accordance with the
standard and syntax of the SCPI programming language.
Operators in SCPI have hierarchical chain structure, for example:
CALCulate:PARameter:DEFine S11
The same COM command written in VB programming language is
as follows:
app.SCPI.CALCulate.PARameter.DEFine = "S11"
Application
CALCulate
DISPlay
INITiate
IEEE4882
SENSe
SYSTem
SOURce
MMEMory
SCPI
TRIGer
OUTPut
HCOPy
SERVice
