Hello, There is no way to send a service request with NI-488.2's LabVIEW VIs. Those VIs are for making a controller side application, not a device side application. If you are trying to make are device side application and need to use SRQs I suggest using <a href="http://sine.ni.com/apps/we/nioc.vp?lang=US&cid=7151";>NI-Device</a>, which has a C++ API.
P.S. This question really belongs in the GPIB dicussion forum.
