# Protocol Priorities

This section details the working priorities within a Configuration Structure regarding CCP and Diagnostic protocols. If either of these protocols is present in the structure by itself, there are no priorities. However, if both protocols are present, then in a single configuration, the priority needs to be considered by users.

In both CCP and Diagnostic protocols running, the CCP protocol has the priority, as shown below:

* When the logger is powered up, it will first attempt to communicate via CCP to establish the connection.
* Once the CCP/XCP connection has been established, the module will communicate via the Diagnostic protocol.
* If no CCP connection can be established, the logger will not communicate via the Diagnostic protocol.

This means that the CCP module is the master and has priority. Therefore, users must establish this connection if a structure is configured with a CCP protocol.

This priority is established to stop any unwanted waking of modules by Diagnostic polling. Diagnostic polling will be possible only when the vehicle is awake, allowing CCP/XCP communication.


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