152 N9310A User’s Guide
6 Subsystem Command Reference
Programming in C using the VTL
This section includes some basic information about
programming in the C language using Agilent VISA transition
library (VTL). Note that some of this information may not be
relevant to your particular application. For example, if you
are not using VXI instruments, the VXI references will not
be relevant.
Typical Example Program Contents
The following table summaries the VTL function calls used in
the example programs.
visa.h This file is included at the beginning of the
each file to provide the function prototypes
and constants defined by VTL. For C and
C++ programs, you must include the visa.h
header file at the beginning of every file that
contains VISA function calls:
#include “visa.h”
ViSession The ViSession is a VTL data type. Each
object that will establish a communication
channel must be defined as ViSession.
Sessions must firstly be opened on the
default resource manager, and then for each
resource you will be using.
viOpenDefaultRM You must first open a session with the
default resource manager with the
viOpenDefaultRM function, and then for
each resource you will be using. This
function will initialize the default resource
manager and return a pointer to that
resource manager session.
viOpenDefaultRM(&sesn)
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