Agilent Technologies E4438C - Saving and Recalling States Using VISA and C

Programming Examples
GPIB Programming Examples
Chapter 2 55
Saving and Recalling States Using VISA and C
In this example, instrument settings are saved in the signal generator’s save register. These
settings can then be recalled separately; either from the keyboard or from the signal
generator’s front panel. Launch Microsoft Visual C++ 6.0, add the required files, and enter the
following code into your .cpp source file.
The following program example is available on the ESG Documentation CD-ROM as
visaex8.cpp.
//****************************************************************************************
// PROGRAM FILE NAME:visaex8.cpp
//
// PROGRAM DESCRIPTION:In this example, instrument settings are saved in the signal
// generator’s registers and then recalled.
// Instrument settings can be recalled from the keyboard or, when the signal generator
// is put into Local control, from the front panel.
// This program will initialize the signal generator for an instrument state, store the
// state to register #1. An *RST command will reset the signal generator and a *RCL
// command will return it to the stored state. Following this remote operation the user
// will be instructed to place the signal generator in Local mode.
//
//****************************************************************************************
#include <visa.h>
#include "StdAfx.h"
#include <iostream>
#include <conio.h>
void main ()
{
ViSession defaultRM, vi; // Declares variables of type ViSession
// for instrument communication
ViStatus viStatus = 0; // Declares a variable of type ViStatus
// for GPIB verifications
long lngDone = 0; // Operation complete flag
viStatus=viOpenDefaultRM(&defaultRM); // Initialize VISA session
// Open session to gpib device at address 19
viStatus=viOpen(defaultRM, "GPIB::19::INSTR", VI_NULL, VI_NULL, &vi);
if(viStatus){ // If problems, then prompt user
printf("Could not open ViSession!\n");
printf("Check instruments and connections\n");
printf("\n");
exit(0);}
printf("\n");
viClear(vi); // Clears the signal generator
viPrintf(vi, "*CLS\n"); // Resets the status byte register
// Print user information
printf("Programming example using the *SAV,*RCL SCPI commands\n");