Example

C/C++

This example is run on the command line. It sends the *IDN? query to the instrument and prints the response to the console.

 

// IdnExample.cpp : Microsoft Visual Studio-Generated Example

// Based on Example 2-1 in the NI-VISA User Manual

// Usage : IdnExample “USB0::0x0B58::0xFFF9::xxxxxxxx_xxx_xx::INSTR”

// where xxxxxxxx_xxx_xx is the USB Device ID of the

// instrument.

// Output : The string identity string returned from the

// instrument.

// VISA Header : visa.h (must be included)

// VISA Libarary : visa32.lib (must be linked with)

 

#include “stdafx.h”

#include “stdio.h”

#include “string.h”

#include “visa.h”

 

#define BUFFER_SIZE 255

 

int main(int argc, char* argv[])

{

ViStatus status; /* For checking errors */

ViSession defaultRM, instr; /* Communication channels */

ViUInt32 retCount; /* Return count from string I/O */

ViChar buffer[BUFFER_SIZE]; /* Buffer for string I/O */

char tempDisplay[BUFFER_SIZE]; /* Display buffer for example */

char *pAddress;

 

/* Make sure we got our address. */

if ( argc < 2 )

{

printf(”Usage: IdnExample \”USB0::0x0B58::0xFFF9::xxxxxxxx_xxx_xx::INSTR”);

printf(”\t where xxxxxxxx_xxx_xx is the USB Device ID of your instrument.\n”);

return -1;

}

 

/* Store the address. */

pAddress = argv[1];

 

/* Begin by initializing the system*/

status = viOpenDefaultRM(&defaultRM);

 

if (status < VI_SUCCESS)

{

/* Error Initializing VISA...exiting*/

printf(”Can't initialize VISA\n”);

return -1;

}

 

/* USB0::0x0B58::0xFFF9::xxxxxxxx_xxx_xx::INSTR*/

/* NOTE: For simplicity, we will not show error checking*/

/* TODO: Add error handling. */

status = viOpen(defaultRM, pAddress, VI_NULL, VI_NULL, &instr);

 

/* Set the timeout for message-based communication*/

/* TODO: Add error handling. */

status = viSetAttribute(instr, VI_ATTR_TMO_VALUE, 120000);

 

/* Ask the device for identification */

sprintf(buffer, “*IDN?\n”);

status = viWrite(instr, (unsigned char *)&buffer[0], 6, &retCount);

status = viRead(instr, (unsigned char *)buffer, BUFFER_SIZE, &retCount);

 

/* TODO: Add code to process data. */

strncpy(tempDisplay, buffer, retCount);

tempDisplay[retCount] = 0; /* Null-terminate display string. */

printf(”*IDN? Returned %d bytes: %s\n”, retCount, tempDisplay);

 

/* Close down the system */

/* TODO: Add error handling. */

status = viClose(instr);

status = viClose(defaultRM);

 

return 0;

}

 

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