How To Use Visa Calls - Keysight Technologies 8163A/B Programming Manual

6 VISA Programming Examples

How to Use VISA Calls

230
The following example demonstrates how to communicate using VISA
calls. Also, the use of instrument identification commands is
demonstrated.
#include <stdio.h>
#include <stdlib.h>
#include <visa.h>
/* This function checks and displays errors, using the error
query of the instrument;
Call this function after every command to make sure your
commands are correct */
void checkError(ViSession session, ViStatus err_status )
{
ViStatus error;
ViChar errMsg[256];
/* queries what kind of error occurred */
error = viQueryf(session,"%s\
n","%t","SYST:ERR?",errMsg);
/*if this command times out, a system error is
probable;
check the GPIB bus communication */
if (error == VI_ERROR_TMO)
{
printf("System Error!\n") ;
exit(1);
}
else
{
/* display the error number and the error message */
if(errMsg[0] != '+')
printf("error:%ld --> %s\n", err_status,errMsg) ;
}
}
void main (void)
{
ViStatus errStatus;
call */
ViSession defaultRM;
variable*/
ViSession vi;
ViChar replyBuf[256]; /*buffer holding answers from
the instrument*/
ViChar c;
8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide
/*return error code from visa
/*default visa resource manager
/*current session handle */