A BAS (Building Automation System) module is a type of computerized system used to control and monitor the operations of a building or facility. It is typically used to automate the processes of heating, ventilation, air conditioning, lighting, security, and other building systems. BAS modules are composed of a number of components, including sensors, controllers, actuators, and software. The sensors detect changes in the environment, such as temperature, humidity, and light levels, and then send this information to the controllers. The controllers use this data to adjust the actuators, which are responsible for controlling the various systems in the building. The software is used to manage the system, and can be used to create schedules, monitor performance, and make adjustments to the system. The overall goal of a BAS module is to create a more efficient and comfortable environment for occupants.