Hopefully DazTheGas might have a solution here. I'm a little stumped trying to get a Serial connection to an arduino. At first  I thought that Lua would be the right way to go because there is already a luars232 package and connection is real easy (I verified this with my LuaForWindows installation on my machine).

When I tried to move that package into Mach, it doesn't work.

Should I just scrap that and dive into Modbus?

I need to be able to:
Read DRO values
Send and receive data from an external box (arduino)
Control the External box via buttons on Mach

Any documentation or help would be greatly appreciated. I'm finishing up our screens and this is the next big chunk

Some more issues
Tabbing through the Screen Tree Manager and properties
More control over color on objects (Like Groups)
Reference images in a folder rather than compile them (Easier to update / manage)
Better Font management / more options