Chapter 2 43
Programming Examples
GPIB Programming Examples
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
viScanf(vi, "%t", rdBuffer); // Reads response into rdBuffer
// Prints the source frequency
printf("Source CW frequency is : %s\n", rdBuffer);
printf("Press any key to continue\n");
printf("\n"); // Prints new line character to the display
getch();
viPrintf(vi, "POW:AMPL?\n"); // Querys the power level
viScanf(vi, "%t", rdBuffer); // Reads the response into rdBuffer
// Prints the source power level
printf("Source power (dBm) is : %s\n", rdBuffer);
printf("Press any key to continue\n");
printf("\n"); // Prints new line character to the display
getch();
viPrintf(vi, "FREQ:MODE?\n"); // Querys the frequency mode
viScanf(vi, "%t", rdBuffer); // Reads the response into rdBuffer
// Prints the source freq mode
printf("Source frequency mode is : %s\n", rdBuffer);
printf("Press any key to continue\n");
printf("\n"); // Prints new line character to the display
getch();
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