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Programming Guide
51
/* to an USB Test & Measurement Class (USBTMC) instrument using */
/* NI-VISA */
/* The example writes the "*IDN?\n" string to all the USBTMC */
/* devices connected to the system and attempts to read back */
/* results using the write and read functions. */
/* The general flow of the code is */
/* Open Resource Manager */
/* Open VISA Session to an Instrument */
/* Write the Identification Query Using viPrintf */
/* Try to Read a Response With viScanf */
/* Close the VISA Session */
/***********************************************************/
ViSession defaultRM;
ViSession instr;
ViUInt32 numInstrs;
ViFindList findList;
ViUInt32 retCount;
ViUInt32 writeCount;
ViStatus status;
char instrResourceString[VI_FIND_BUFLEN];
unsigned char buffer[100];
char stringinput[512];
int i;
/** First we must call viOpenDefaultRM to get the manager
* handle. We will store this handle in defaultRM.*/
status=viOpenDefaultRM (&defaultRM);
if (status<VI_SUCCESS)
{
printf ("Could not open a session to the VISA Resource Manager!\n");
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