MOST bus: Notes

The MOST (Media Oriented Systems Transport) bus uses a ring bus for data traffic between the various control units. Signal transmission is by means of optical fibre. Data transmission on the ring bus takes place in one direction only. On the MOST ring, messages can only be transmitted provided the bus ring is complete and fully functional. If the ring is broken, diagnosis communication is only possible with the central gateway module (ZGM). This is possible because the control unit is directly connected to the K-CAN. The headunit also a K-CAN connection, but no gateway function. For this reason, if the MOST bus is interrupted it is no longer possible to communicate with the headunit.

The MOST (Media Oriented Systems Transport) bus uses a ring bus for data traffic between the various control units. Signal transmission is by means of optical fibre. Data transmission on the ring bus takes place in one direction only. On the MOST ring, messages can only be transmitted provided the bus ring is complete and fully functional. If the ring is broken, diagnosis communication is only possible with the head unit (dependent on equipment fitted).