Hey guys, thanks for posting the PDF version of the manual. It makes things much clearer.

CHIMERA1960, you said you had contacted a manufacturer of the board and that they were in Singapore. Can you tell me about this VFD board maker? I'm interested in the RS485 aspects of the board, and the manual isn't too detailed. For more info on RS485, it says to contact them on their "website", which obviously isn't linked in the document.
Is it the same boards as the JD inverter that windom46 posted the manual for?