Agilent Technologies Model A.08.xx manual 132

Programming Examples

Reading Trace Data Using 32-bit Real Format (RS-232)

scanf( "%c",&cEnter);

/*Externally route the 50MHz Signal*/ viPrintf(viESA,"CAL:SOUR:STAT ON \n");

}

}

void main()

{

/*Program Variables*/ ViStatus viStatus= 0;

ViChar _VI_FAR cResult[1024000] = {0};

ViReal32 dTraceArray[1024] = {0};

char cBufferInfo[7]= {0}; long lNumberBytes =0L; long lOpc =0L;

unsigned long lRetCount = 0L; int iSize = 0;

/*BytesPerPnt is 4 for Real32 or Int32 formats, 8 for Real64, and 2 for Uint16*/ int iBytesPerPnt = 4;

int iSwpPnts = 401; /*Number of points per sweep*/

int iDataBytes = 1604;/*Number of data points, assuming 4 bytes per point*/

int iHeaderBytes = 6; /*Number of bytes in the header, assuming 1604 data bytes*/ FILE *fTraceFile;

/* Open a serial session at COM1 */ viStatus=viOpenDefaultRM(&defaultRM);

if (viStatus =viOpen(defaultRM,"ASRL1::INSTR",VI_NULL,VI_NULL,&viESA) !=

VI_SUCCESS)

{

printf("Could not open a session to ASRL device at COM1!!\n"); exit(0);

}

/*Clear the instrument */ viClear(viESA);

/*Reset the instrument. This will set number of sweep points to default of 401*/ viPrintf(viESA,"*RST\n");

/*Display the program heading */

printf("\n\t\t Read in Trace Data using ASCII Format (using RS-232) Program \n\n" );

/* Set the input port to the internal 50MHz reference source */ Route50MHzSignal();

132 Chapter 3