Hi ; I m back at my Triac retrofit and it was recommended that I used the 485 connection of the VFD (Galt 200) I got some twisted wire and usb converter and I can get the drive started in the Modbus Control in test modbus and chnge the speed in Mach3 but I can stop it in Mach by pressing reset, probably don t have the right brain and Modbus configuration. Any help would be appreciated.