This document specifies the hardware requirements needed to carry out building automation tasks. This document is applicable to physical devices, i.e.: — devices that require human interaction, such as management stations or operator panels; — devices for data storage and analysis, such as edge or cloud servers; — devices for control applications, such as automation stations; — devices for physical quantities acquisition, such as sensors and actuators. This document provides a generic system topology based on a building network infrastructure, which includes both the devices inside the building envelope and those outside the building envelope.