Relation To The OSI Model
Since no bus system was available for the requirements of meter reading, the M-Bus was developed by Professor Dr. Horst Ziegler of the University of Paderborn in cooperation with Texas Instruments Deutschland GmbH and Techem GmbH. The concept was based on the ISO-OSI Reference Model, in order to realize an open system which could utilize almost any desired protocol.
Since the M-Bus is not a network, and therefore does not - among other things - need a transport or session layer, the levels four to six of the OSI model are empty. Therefore only the physical, the data link, the network and the application layer are provided with functions.
| OSI Model | |||
|---|---|---|---|
| Data unit | Layer | Standard | |
| Host layers |
Data | 7. Application | EN1434-3 |
| 6. Presentation | Empty | ||
| 5. Session | Empty | ||
| Segment/Datagram | 4. Transport | Empty | |
| Media layers |
Packet | 3. Network | Optional |
| Frame | 2. Data link | IEC 870 | |
| Bit | 1. Physical | M-Bus | |
Read more about this topic: Meter-Bus
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