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90 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide
Programming Examples
GPIB Programming Interface Examples
lngDone=0; // Reset the operation complete flag
viPrintf(vi, "*RCL 1\n"); // Recalls stored register #1 state
viPrintf(vi, "*OPC?\n"); // Checks for operation complete
while (!lngDone)
viScanf (vi ,"%d",&lngDone); // Waits for setup to complete
// Print user information
printf("The signal generator has been returned to it's Register #1 state\n");
printf("Press Enter to continue\n");
printf("\n"); // Prints new line character
getch(); // Waits for user input
lngDone=0; // Reset the operation complete flag
viPrintf(vi, "*RST\n"); // Resets the signal generator
viPrintf(vi, "*OPC?\n"); // Checks for operation complete
while (!lngDone)
viScanf (vi ,"%d",&lngDone); // Waits for setup to complete
// Print user information
printf("Press Local on instrument front panel to return to manual mode\n");
printf("\n"); // Prints new line character
// Close the sessions
viClose(vi);
viClose(defaultRM);
}
Reading the Data Questionable Status Register Using VISA and C
In this example, the signal generator’s data questionable status register is read. You will be asked to
set up the signal generator for error generating conditions. The data questionable status register will
be read and the program will notify the user of the error condition that the setup caused. Follow the
user prompts presented when the program runs. Launch Microsoft Visual C++ 6.0, add the required
files, and enter the following code into your .cpp source file. visaex9.cpp performs the following
functions:
•error checking
• clears the signal generator
• resets the signal generator
• the data questionable status register is enabled to read an unleveled condition
• prompts user to manually set up the signal generator for an unleveled condition
• queries the data questionable status register for any set bits and converts the string data to
numeric
• based on the numeric value, program checks for a corresponding status check value
• similarly checks for over or undermodulation condition
The following program example is available on the signal generator Documentation CD-ROM as
visaex9.cpp.
//***************************************************************************************
// PROGRAM NAME:visaex9.cpp
//