This article applies to the following CoolMaster products CoolMaster CoolMasterPro CoolMasterNet CloudBox HVAC Communication TerminalsHVAC outdoor connection Connecting to the line plug Secure the cables from Outdoor in RS485Secure cables in Output 3 / Modbus to CoolMasterNet. Plugging to the CoolMasterInsert the plug in to the CoolMaster L7 socket. Check DIP Switches are set correctlyDip switches setup for VRF HVAC system on L7.