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13.3 Example
A sample CAN message has the following structure: X18FEE9018FFFFFFFF23840300, where
essential parts are ‘FEE9’ – identifier and ‘FFFFFFFF23840300’ – data bytes.
CAN messages are configured like any other I/O parameters. They consist of 4 identifier
bytes and 8 data bytes. Below you will find a sample configuration for fuel consumption
parameter:
ID type – is always 29 bits.
Output data mask – defines which data bytes are sent to the server (sometimes not all data
bytes are necessary).
CAN ID – this is 4 byte identifier. Messages use 4 bytes, but the first and last bytes may
differ in different vehicle models while the middle four bytes are the same for all vehicles. The
first and last bytes may have any value. Because of this reason it is recommended to write FF in
the first byte and the same in the last byte.
This information is provided only as an example and Teltonika
takes no responsibility for information accuracy or damage that may be done
to the vehicle or FM6320 module while integrating it.
Example:
All Mercedes Benz Actros 2 models with Vehicle Identification Number (VIN) starting with
WDB93 have a possibility to connect FM6320 module to CAN bus. This can be done by
connecting to special PSM module (which may or may not be included in the truck) or ground
module of the vehicle. For CAN signal to be available, parameter 520 must be enabled in
“kommunikationsschnittstelle” in the vehicle with Mercedes Stardiagnose.
CAN wires can be found on X5 connector located in the fuse box (Figure 62):
Pin 5: CAN Low signal (yellow wire)
Pin 2: CAN High signal (blue wire)
Figure 62 X5 plug on Mercedes Benz
In the example FM6320 will filter all CAN messages with identifier FFFEE9FF (fuel
consumption) (Figure 63).