GMV DC Inverter VRF 
49 
 
Fig. 3.9.4 
 
Fig. 3.9.5 
 
Fig. 3.9.6 
3.9.4 Communication Address Setting 
The indoor unit and outdoor unit adopt automatic addressing technology. It is not necessary to 
manually set the address code. It only needs to set the main module and centralized control address 
(set it when centralized control of multiple refrigeration systems is required) . 
3.9.5 Communication Connection between IDU and ODU 
Communication between IDU  and  ODU  is connected through the D1/D2 port of the 
communication terminal block.