HP ESA-E Series Programmer's Manual page 97

viStatus=viOpenDefaultRM(&defaultRM);
if
(viStatus=viOpen(defaultRM,"ASRL1::INSTR",VI_NULL,VI_NULL,&v
iESA) != 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\tRead in Trace Data using ASCII format
(RS232) Program \n\n" );
/*Check for the analyzer model number and route the
50 MHz signal accordingly*/
Route50MHzSignal();
/*Set the analyzer center frequency to 50 MHz*/
viPrintf(viESA,"SENS:FREQ:CENT 50 MHZ\n");
/*Set the analyzer to single sweep mode*/
viPrintf(viESA,"INIT:CONT 0 \n");
/*Trigger a sweep*/
viPrintf(viESA,"INIT:IMM; \n");
/*Read the operation complete query*/
viQueryf(viESA, "*OPC?\n", "%d", &lOpc);
if (!lOpc)
{
printf("Program Abort! error ocurred: last command was
not completed!\n");
exit(0);
}
/*Specify units in dBm*/
viPrintf(viESA,"UNIT:POW DBM; \n");
/*Set the analyzer trace data format to ASCII format*/
viPrintf(viESA,"FORM:DATA ASC; \n");
Chapter 3
Programming Examples
Reading Trace Data Using ASCII Format (RS-232)
3-33