iSMA-B-MG-IP User Manual
www.ismacontrolli.com
DMP260en | 1st Issue rev. 6 | 05/2022
page 21 of 29
Figure 14. M-Bus tree topology
Separator
Figure 15. M-Bus extended star topology
6.4 M-Bus Settings
6.4.1 About M-Bus
The M-Bus (Meter Bus) was developed to fill the need for a system for networking and
remote reading of utility meters, for example, to measure a consumption of gas or water
in the house. This bus fulfils special requirements of remotely powered or battery driven
systems, including consumer utility meters. If 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.
Topology and Cable
The M-Bus is a hierarchical system, with communication controlled by a master device
(for example, the AAC20-M). The M-Bus consists of a master, a number of slaves (end-