We use CIMCO DNC-Max to drip feed via Moxa units since the software has been optimized to work with them. Using this approach you can get the fastest transfer speed possible via RS232. If you setup your drip feed properly as well as your path filtering in your CAM you will likely never need anything else for the machine. We routinely run our machine for more than 10 hours non-stop using this setup and it works very well. On the older Philips/Grundig versions of this control it is pretty much the only way to run them on large programs.

Dan (Dullfig), can you please contact me? I have access to plenty of documentation on the Millplus controls but I also would like to get feedback on how your v420 install went.