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Specification of Diagnostic Communication Manager Introduction and functional overview  The Dcm SWS describes the functionality, the API, and the configuration of the AUTOSAR Basic Software module Dcm (Diagnostic Communication Manager). The Dcm module provides a common API for diagnostic services. The functionality of the Dcm module is used by external diagnostic tools during the development, manufacturing or service. Figure 1.1: Overview of the communication between the external diagnostic tools and the onboard AUTOSAR Application The Dcm module ensures diagnostic data flow and manages the diagnostic states, especially diagnostic sessions and security states. Furthermore, the Dcm module checks if the diagnostic service request is supported and if the service may be executed in the current session according to the diagnostic states.The Dcm module provides the OSI-Layers 5 to 7 of Table 1: Diagnostic protocols and OSI-Layer. Table 1.1: Diagnostic protocols and OSI-Layers At OSI-leve...