User manual iSMA-B-AAC20/M-Bus Network
Version 1.2
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Figure 1 Sedona Installer
3 About M-Bus
The M-Bus (Meter Bus) was developed to fill the need for a system for the networking and
remote reading of utility meters, for example, to measure the consumption of gas or water in
the house. This bus fulfils the special requirements of remotely powered or battery-driven
systems, including consumer utility meters. When interrogated, the meters deliver the data
they have collected to a common master, for example, a DDC controller or a hand-held
computer, connected at periodic intervals to read all utility meters of a building.
3.1 M-Bus Topology and Cable
The M-Bus is a hierarchical system, with communication controlled by a master (for
example the iSMA-B-AAC20-M). The M-Bus consists of the master, a number of slaves (end-
equipment meters), and a two-wire connecting cable. The slaves are connected in parallel to
the transmission medium - the connecting cable.
