The present invention relates to an ALS system and method for controlling a bagnet device supporting the bagnet protocol, which is compatible without incurring additional equipment or costs to the intelligent building system supporting the bagnet protocol. Create a standard schedule object according to the BACnet protocol based on the BACnet device to control, an ALS control unit to generate an ALS control command for controlling the BACnet device, and generate a standard schedule object to the BACnet device. Includes an ALS server that transmits and requests to create a schedule object. This enables the introduction of a compatible ALS system to an intelligent building system that supports the BACnet protocol without the need for additional equipment or costs.;BACNET Protocol, ALS, Lighting, Control
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