After reading the power meter N77x manual, i had downloaded the driver 816x and convert the driver to become labview environment. My project is send the trigger pulse out from laser instrument and received by power meter. I had study the power meter manual document, it is need to setup the trigger in to "single" as my trigger out from laser instrument is using "step". However, my code will hang when i set driver's trigger in to "single" for my power meter. I have no idea on this. Can anyone help to give me some tips how to use trigger in for power meter?