HP E8402A, User And Service Manual, Page: 46 / 249

48 Programming the Enhanced Monitor Chapter 3
Example 1:
Self Test &
Verification
The following example program resets the Enhanced Monitor, performs a complete
self test (this can take up to seven minutes to complete), read the mainframe model
number string, read the mainframe serial number, and writes data to the Enhanced
Monitor display.
#include <visa.h>
#include <stdio.h>
#include <stdlib.h>
/* Interface address is 9, Enhanced Monitor secondary address is 224*/
/* #define INSTR_ADDR “GPIB0::9::224::INSTR” */
#define INSTR_ADDR “GPIB-VXI0::224::INSTR”
/* a simple VISA error-handling macro. This version prints the line number from which
it was called and exits if it gets an error */
#define CHECKERR(errStatus, line) if (errStatus < VI_SUCCESS) { \
printf(“Line %d: error %x returned from visa. Aborting\n”, \
line, errStatus); \
exit (errStatus); \
}
int main()
{
ViStatus errStatus;
/*Status from each VISA call */
ViSession viRM;
/*Resource mgr. session */
ViSession en_mon;
/* Enhanced Monitor session */
int into; /* variable for *OPC? */
char id_string[256]; /* Model Number string */
char ser_num[256]
/* mainframe serial number */
chr txt_string[256] /* String sent to display */
char selftst_string[256];
/* Self-test string */
/* Open the default resource manager */
errStatus = viOpenDefaultRM (&viRM);
CHECKERR(errStatus, __LINE__);
/* Open the Enhanced Monitor instrument session */
errStatus = viOpen(viRM,INSTR_ADDR,VI_NULL,VI_NULL,&en_mon);
CHECKERR(errStatus, __LINE__);
/* Reset the Enhanced Monitor */
errStatus = viQueryf(en_mon, “*RST;*OPC?\n”,”%i”,&into);
CHECKERR(errStatus, __LINE__);
/* Set Timeout Value to 8 minutes for Self Test */
viSetAttribute (en_monA,VI_ATTR_TMO_VALUE,480000);
/* Perform Enhanced Monitor Self-Test - approx. 7 minutes */
errStatus = viQueryf(en_mon, “TEST:ALL?\n”, “%t”, selftst_string);
CHECKERR(errStatus, __LINE__);
printf(“Self Test Result is %s\n”, selftst_string);
PROGRAM CONTINUED NEXT PAGE