Old thread, but thought I'd put something in here that I had to figure out to communicate SCPI over ethernet with a Siglent scope (don't remember model, 4 channel). I communicate with instruments using LabVIEW's VISA Read and Write vis. I discovered that I had to put the VISA vis in synchronous mode. It isn't even a wired option of the vi. You have to right click on the "VISA Write" or "VISA Read" vi and select either "Do I/O Synchronously" or ""Do I/O Asynchronously". Asynchronous is the default, and the Siglent scope didn't like it. In all my years of remote instrument control with LabVIEW (about 30 years) I've never run across this one. I didn't know it existed. I've got old HP gear that I have to use a different GPIB "mode" from the default, but never heard of the synchronous thing.
It was in the Siglent manual to use synchrounous. This was at work, so I don't have the scope or the manual in front of me to double check this. I am really disappointed in the remote operation of the scope. I've worked with many different instruments, and reading the waveform is the least straight forward of anything I've come across (getting all the parameters correct for scaling and such). If it comes time to buy a similar type scope for home, this would be my biggest negative on the Siglent. I've been ok with the basic manual operation of it.