It turns out the relay driver is a $160 option. For a little less money one could instead use a brick PLC with six outputs instead of four and also have eight inputs. The Tri-Star Modbus interface is well documented and shows that it would be a simple matter to interface with a PLC to make a load dump.
I couldn't find a manual for MSView on Morningstar's website and there isn't one in the downloadable zip file. I didn't install the software but I suppose a help file is included in the executable.
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