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Digital Oscilloscope Series
226
3. Coding:
a) USBTMC:
Int Usbtmc_test()
{
/* This code demonstrates sending synchronous read & write commands */
/* 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);
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