Samsung NASA VRV systems to Modbus Gateway. The newer version of this device is IN770AIR00SO000The SM-ACN-MBS (INMBSSAM004O000) IntesisBox Gateway has been specially designed to allow bidirectional control and monitoring of Samsung NASA VRV systems from a BMS, SCADA, PLC or any other device working as a Modbus Master.The SM-ACN-MBS (INMBSSAM004O000) gateway is directly connected to the outdoor units communication bus and enables the control of al..