9
M-Bus and Wireless M-Bus
9.1 Development of the Standard
The M-Bus standard was the result of collaboration between Dr. Horst Ziegler of the University of Paderborn, a chip maker (Texas Instruments) and a company focused on metering data management (Techem). In 1990 there was no established communication standard for the reading of utility metering devices: such a standard had to be low cost and adapted to battery-powered meters.
The original design uses a simple two-wire serial communication bus, and is documented at http://www.m-bus.com/. One major advantage of the new bus was that all meters and the reading device could be connected to the same wire (which is why it is called a bus).
The link layer used by M-Bus was initially standardized in 1990 as IEC 870-5-1 (Telecontrol Equipment and Systems/Transmission Protocols/Transmission Frame Formats) and IEC 870-5-2 (Link Transmission Procedures, 1992). The first standard to be published related to the M-Bus application layer was EN 1434 in 1997, where parts -2 and -3 define an application layer for a wire communication protocol dedicated to heat meters.
The standardization work is now managed by Cenelec Technical committee TC 294, which generalized the use of M-Bus for any type of meter readout in the EN 13 757 series:
- EN13757-1:2002 Data exchange (DLMS);
- EN13757-2:2004 Physical and link layer (M-Bus);
- EN13757-3:2004 Dedicated application layer (M-Bus);
- EN13757-4:2005 Wireless meter readout (wM-Bus);
- EN13757-5:2007 Relaying ...
