"Paul F. Prew" wrote... > Whay are there no synchronous/asychronous flavours of GPIB 488.2 > commands like the traditional GPIB commands?
It's because the C API in NI-488.2 (aka, the NI GPIB driver) doesn't offer an asynchronous interface; the GPIB command is always done synchronously in the driver. The "traditional" GPIB C API has functions like "ibrda()" and "ibwrta()" which we call from LabVIEW to do asynchronous I/O. The asynchronous driver calls became less important when LabVIEW became multithreaded. Do you have a particular application in mind for asynchronous 488.2 functions?