Agilent Technologies 86038B User Manual page 210

Updating PDLA Status
210
Updating the PDLA status is completely asynchronously from
any measurement operation. Every 500 ms, StatusTimer wakes
up and queries the PDLA to find out what it is doing. This is
handled in StatusTimer_Timer(). In addition, whenever a new
status message appears on the PDLA front panel, the NewStatus
event handler, pdlaClient_NewStatus(), reads the message and
displays it for the remote user as well.
Agilent 86038B Photonic Dispersion and Loss Analyzer, Second Edition