To connect your computer to a VE.Bus product (Multis, Quattros and Inverters), you need a driver for MK2-USB (ASS030130000) / MK3-USB (ASS030140000) and an RJ45 UTP cable (ASS030064xxx and ASS030065xxx). VEFlash (v9005163) - Firmware update tool to update VE.Bus products.VE.Bus System Configurator (v9009154) - For larger installations.VE.Bus Quick Configure (v9010154) - For installations up to 3 Multis.