Interface MK3/MK2-USB
The MK3-USB allows the following products to connect to a computer for configuration and firmware updates:
Multi, MultiGrid, MultiPlus, MultiPlus-II, Quattro, Inverter/Charger settings in ECOmulti, EasySolar, EasyPlus, and Inverters with a VE.Bus communication port.
The MK2-USB is for Phoenix Charger only.
VE.Bus Configuration guide