The communication interfaces specified in this document are based on ISO 11898-1 and ISO 11898-2 (Controller Area Network) as well as the CANopen1 application layer as specified in EN 50325-4 respectively CiA 301. This document specifies the CANopen-based interfaces for the fire-fighting equipment host controller and dedicated fire-fighting equipment units. Additionally, this document specifies process data mapped into PDM (process data object) messages as well as an optional mapping into the CANopen Object Dictionary. The host controller gateway functionality to the in-vehicle network is not in the scope of this document.