I have a new Hitachi WJ200 VFD installed on a mill. It works fine manually. Now I am ready to connect it to Mach 3 with Modbus TCPIP. Can I just use a USB cable from my computer to the USB port on the inverter? If so, specifically what type of cable do I need? The end on the inverter is not a type I recognize. I see mention on several threads about a RS232 to 485 converter.... Not thinking I need that with this inverter? If not the USB then how do I need to physically connect the inverter to the computer?