Ducati Diavel
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Ducati Diavel Service Manual: On-board computers and the can line

The following on-board computers make up the electrical system of the diavel and are connected with each other via the can line (or network):

On-board computers and the can line


The drawing illustrates the network connecting the different computers ('nodes') on the diavel. The dtc system is not a separate unit and is integrated in the bbs.

The main characteristics of the computers used on the diavel are described as follows:

The networked connection of the individual computers (nodes) creates a distributed system in which the nodes may communicate with one another and coordinate their actions by exchanging messages. This offers the following advantages:

The network allowing communication between the different nodes on the diavel is a serial (bus) type can (controller area network) network. Each node contains a circuit that can transmit and receive data to and from the network in accordance with priorities defined by specific bits included within the data itself (the message travelling over the network is always the one with the highest priority). As a result, the can bus network does not need to be managed with a specific centralised arbitration procedure that defines the priorities with which the elements connected to the network must communicate.

Each message travelling over the can network consists of a "train" of electrical impulses containing, as mentioned previously, the priority - in other terms the type of message - the data itself, the confirmation of reception and other data necessary for correct transmission and reception. The train of impulses is transmitted to the bus, which consists of two wires - can h and can l. Each node extrapolates the message and, as a result, the data contained, processing the Sequences of impulses received from on the can h and can l wires independently. This ensures superior reliability, as any interference in the electrical signals is effectively subtracted and eliminated.

On-board computers and the can line


One drawing shows the typical voltages on the can h and can l wires for each electrical impulse contained in the train "transporting" information shared by the nodes connected to the network. The other drawing shows the signal extrapolated by each node from the difference between the two former signals.

In short, the advantages of using the can bus are as follows:

Note that the control function for the electrical impulses travelling over the can network has no validity for diagnostic purposes, as the information contained in the trains themselves cannot be identified.

Introduction to the electrical system of the diavel
...

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