HP ESA-E Series - Page 101

Chapter 3 3-37
Programming Examples
Reading Trace Data Using 32-bit Real Format (RS-232)
/*Program Variables*/
ViStatus viStatus= 0;
ViChar _VI_FAR cResult[5000] = {0};
ViReal32 dTraceArray[401] = {0};
char cBufferInfo[6]= {0};
long lNumberBytes =0L;
long lOpc =0L;
unsigned long lRetCount = 0L;
int iSize = 0;
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 analyzer */
viClear(viESA);
/*Reset the analyzer */
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 50 MHz amplitude reference*/
Route50MHzSignal();
/*Set analyzer to single sweep mode */
viPrintf(viESA,"INIT:CONT 0 \n");
/* Set the analyzer to 50 MHz center frequency */
viPrintf(viESA,"SENS:FREQ:CENT 50 MHZ\n");
/*Set the analyzer to 50 MHz Span */
viPrintf(viESA,"SENS:FREQ:SPAN 50 MHZ\n");