Agilent Technologies E3633A Example Program for C and C++, Diode.c, Continued on next page 135

Chapter 6 Application Programs Example Program for C and C++

Example Program for C and C++

The following C programming example shows you how to send and receive formatted I/O. This example programming shows you how to use the SCPI commands for the instrument with the VISA functionality and does include error trapping. For more information on non-formatted I/O and error trapping, refer to the Agilent VISA User’s Guide.

The following C programming example was written in MicrosoftÒ Visual C++ version 1.52 using project type “QuickWin application’’, and using the large memory model and C++ version 4.x or 5.0 using project type “Windows 32 application’’. Be sure to move the “visa.lib (WindowsÒ 3.1) or visa32.lib (WindowsÒ 95/NT)” and “visa.h” file to the lib and include development directory. These are usually found in the c:\vxipnp\win(win95 or winnt)\lib\msc or c:\vxipnp\win (win95 or winnt)\include directory.

Diode.c

/*Diode.C

This example program steps the power supply through 11 voltages and measures the current response. It prints the voltage step and the current response as a table. Note that the GPIB address is the default address from the factory for the power supply.*/

#include <visa.h> #include <stdio.h> #include <string.h> #include <time.h> #include <conio.h> #include <stdlib.h>

ViSession		defaultRM;	/* Resource manager id	*/
ViSession		power_supply;	/* Identifies power supply	*/
int	bGPIB = 1;		/* Set the number to 0 for use with the RS-232 */
long	ErrorStatus;		/* VISA Error code	*/
char	commandString[256];
char	ReadBuffer[256];
void	delay(clock_t wait);
void	SendSCPI(char* pString);
void	CheckError(char* pMessage);
void	OpenPort();

void main()
{
double	voltage;	/* Value		of	voltage sent to power supply		*/
char	Buffer[256];	/*	String returned from power			supply	*/
double	current;	/*	Value	of	current output of	power supply	*/

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