Agilent Technologies 8164A, B, 8166A, 8163A manual 191, How to Use Visa Calls

How to Use VISA Calls VISA Programming Examples

/* Initialize visa resource manger */

errStatus = viOpenDefaultRM (&defaultRM); if(errStatus < VI_SUCCESS)

{printf("Failed to open VISA Resource manager\n"); exit(errStatus);

}

/* Open session to GPIB device at address 20; the VI_NULL parameters 3,4

are mandatory and not used for VISA 1.0*/

errStatus = viOpen (defaultRM, "GPIB::20::INSTR", VI_NULL,VI_NULL,&vi);

if(errStatus < VI_SUCCESS)

{printf("Failed to open instrument\n"); exit(errStatus);

}

/* set timeout to 20 sec; this should work for all commands except for zeroing or READ commands with averaging times greater than the timeout */

errStatus = viSetAttribute(vi,VI_ATTR_TMO_VALUE,20000); checkError(vi,errStatus);

/* get the identification string of the instrument mainframe*/ errStatus = viQueryf(vi,"%s\n","%t","*IDN?",replyBuf); if(errStatus < VI_SUCCESS)

{checkError(vi,errStatus); } else printf("%s",replyBuf);

/* identify the installed modules */

errStatus = viQueryf(vi,"%s\n","%t","*OPT?",replyBuf); if(errStatus < VI_SUCCESS)

{checkError(vi,errStatus); } else printf("%s",replyBuf);

/* get information about the available options of a slot */ errStatus = viQueryf(vi,"%s","%t","SLOT1:OPT?\n",replyBuf); if(errStatus < VI_SUCCESS)

{checkError(vi,errStatus); } else printf("%s",replyBuf);

/*loop, until a key is pressed */ while(!scanf("%c",&c));

/*close the session */ viClose(vi);

}

Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition 191