HP 8163A Programming Manual page 145

Programming Examples
How to Set up a Fixed Laser Source
{
printf("Failed to open VISA Resource manager\n");
exit(errStatus);
}
/* Open session to HPIB device at address 20;*/
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 zeroing */
errStatus = viSetAttribute(vi,VI_ATTR_TMO_VALUE,20000);
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* first get the wavelength of the laser source; to address the second channel
of a dual laser source use "CHAN2" instead of "CHAN1"*/
errStatus = viQueryf(vi,"%s","%f","SOURCE2:CHAN1:WAV?\n",&wavelength);
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
else
{
printf("Source Wavelength:%g\n",wavelength);
}
/* to receive the maximum power the attenuation must be set to zero */
errStatus = viPrintf(vi,"SOURCE2:CHAN1:ATT 0\n");
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* turn off amplitude modulation */
errStatus = viPrintf(vi,"SOURCE2:CHAN1:AM:STATE 0\n");
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* turn the laser on */
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