The definition of a BAS (Building Automation System) versus a BMS (Building Management System) is often a source of confusion. A BAS is a system that is designed to monitor and control the mechanical and electrical equipment in a building, such as heating, ventilation, air conditioning, lighting, and security systems. It is usually a distributed system that consists of sensors, controllers, and actuators that are connected to a central computer. The BAS can be programmed to automatically adjust the settings of the equipment in order to optimize the performance of the building and its systems.

A BMS, on the other hand, is a system that is designed to manage the overall operations of a building. It is typically a centralized system that consists of a computer and software that can be used to monitor and control the various systems in the building. The BMS can be used to track energy usage, monitor and control the building’s temperature, and provide data to help optimize the building’s performance. The BMS can also be used to monitor and control access to the building, as well as provide a variety of other services.