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Programming Example
Programming in C using the VTL
Programming in C using the VTL
This section includes some basic information about
programming in the C language using Keysight 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)
viOpen This function establishes a communication channel with the device
specified. A session identifier that can be used with other VTL functions
is returned. This call must be made for each device you will be using.
viOpenDefaultRM(&sesn)
viOpen(sesn, rsrcName, accessMode, timeout, &vi)
viPrintf
viScanf
These are the VTL formatted I/O functions that are patterned after
those used in the C programming language. The viPrintf call sends
the SCPI commands to the analyzer. The viPrintf call can also be
used to query the analyzer. The viScanf call is then used to read the
results.
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