MIM-B17BN and MIM-B17BUN are the same. The only difference is MIM-B17BUN has an updated power cord for North America. The improved Samsung DMS (Data Management Server) 2.5 with BACNET is now smarter. It can manage a variety of different air conditioning units, and the newly upgraded functions can automatically manage the air conditioning system for users. Features include: built-in web server for PC-independent management and remote access control, weekly / daily schedule control, data storage in non-volatile memory and SD memory, current time management even during power failure (for 24 hours), emergency stop function with simple contract interface, unoccupied room control configuration, 10 digital inputs, 8 digital outputs, maximum 256 indoor unit connection, and many other features.