Building automation and control system and method for operating the same

PURPOSE: A building automatic control system and an operating method thereof are provided to control building devices in which two or more communication protocols coexist without using a BACnet gateway. CONSTITUTION: A building controller (100) is installed in a building. The building controller controls devices which form a subnet. A first device (210) is connected with the building controller by using a first protocol. The first device transmits and receives first data. A second device (220) is connected with the building controller by using a second protocol. The second device transmits and receives second data. [Reference numerals] (100) Building controller; (210) First device #1; (220) Second device #1; (AA) Subnet 1; (BB) First device #2; (CC) First device #i; (DD) Subnet 2; (EE) Second device #2; (FF) Second device #j; (GG) Subnet N; (HH) N device #1; (II) N device #2; (JJ) N device #k