Victron Energy - MK3-USB (VE.Bus to USB) 

SKU: ASS030140000

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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.

spec sheet: ASS030140000