Keysight 81150A - Page 594

Appendix
594
The following is a summary of the VISA function calls used in the previous
example programs. For more detailed explanation of VISA functionality, see
Keysight IO Libraries Suite “Programming with VISA”.
visa.h
This file is included at the beginning of the
file to provide the function prototypes and
constants defined by VISA.
ViSession
The ViSession is a VISA type data type.
Each program that will establish a
communication channel must be defined as
ViSession.
viOpenDefaultRM
You must first open a session with the default
resource manager.
viOpen
This function establishes a communication
channel with the device specified. This call
must be made for each device you will be
using.
viPrintf,viScanf
These are the VISA formatted “C like” I/O
functions.
viClose
This function must be used to close each
session. All allocated data structures that had
been allocated for the session, will be
deallocated.
viSerAttribute
This function is used to change attributes of
an active ViSession.