The six European manufacturers Mercedes-Benz, MAN, Scania, Volvo (including Renault), DAF and Iveco developed the so-called FMS-Standard in 2002 to make manufacturer-independent applications for telematics possible.
The repetition rate of the data is between 20 ms (e.g. engine speed) and 10 seconds (e.g. vehicle identification number).
With the FMS standard it is now possible to have manufacturer independent applications and evaluations of the data.
A direct connection to the internal vehicle bus system is not permitted by the truck manufacturers and could lead to the loss of warranty.
Meanwhile, some manufacturers are quite restrictive in their workshops and cut all unknown connections to the internal bus system.