Cable type
The cable used must be suitable for an ambient
temperature of at least 80 °C.
Use 2-core, twisted, screened cable wherever possible
for optimum data transmission.
Recommended cable types:
Unitronic LIYCY 4x0.75
Bus structure
• All devices are connected in a star, line or tree struc-
ture, whereby each device has its own address within
the bus (see also Parameter programming).
• A subdivision of the network structure into individual
segments is implemented via repeaters (line amplifi-
ers).
• Up to 250 subscribers can be connected together in
a single segment. However, the characteristics of the
Master device are the defining factors here.
• If the master is replaced, the bus is out of service.
• Devices can be replaced without the bus being un-
stable.
Star structure
• Each measurement device is linked directly to the
M-Bus Master. Faults in the bus system are localised
faster by switching the individual devices on and off.
Line structure
• The connection of the measurement devices is se-
quential, in a line. With this possible faults in the bus
system may arise due to the voltage drop. Faults
within the system are harder to localise in this cheaper
structure.
C
For the wiring of the Modbus connection,
CAT cables are not suitable. Please use
the recommended cables.
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