NI PCIe-GPIB Used As Listener (Not Controller) Using 488.2 .NET API

Hi everyone,

I have a project where a customer is replacing an obsolete piece of hardware (with no replacement options) using off the shelf hardware and custom C# software. They do not want to replace the UNIX test controller which interfaced with the hardware as a GPIB controller. For the most part, I have figured out how to use the 488.2 .NET API using C# as a listener, but I cannot figure out how to send an SRQ request back to the controller. I have searched for solutions online and looked through the sparse documentation and object browser in Visual Studio, but no luck so far. 

Thanks,

John