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76 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide
Programming Examples
GPIB Programming Interface Examples
• resets the signal generator
• queries the instrument (CW frequency, power level, frequency mode, and RF state)
• reads responses into the rdBuffer (CW frequency, power level, and frequency mode)
• turns signal generator RF state off
• verifies RF state off
The following program example is available on the signal generator Documentation CD-ROM as
visaex3.cpp.
//****************************************************************************************
// PROGRAM FILE NAME:visaex3.cpp
//
// PROGRAM DESCRIPTION:This example demonstrates the use of query commands. The signal
// generator can be queried for conditions and instrument states. These commands are of
// the type "*IDN?"; the question mark indicates a query.
//
//****************************************************************************************
#include <visa.h>
#include "StdAfx.h"
#include <iostream>
#include <conio.h>
#include <stdlib.h>
using namespace std;
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
char rdBuffer [256]; // Declares variable to hold string data
int num; // Declares variable to hold integer data
// Initialize the VISA system
viStatus=viOpenDefaultRM(&defaultRM);
// 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);}
viPrintf(vi, "*RST\n"); // Resets signal generator
viPrintf(vi, "FREQ:CW?\n"); // Querys the CW frequency