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M-Bus Master MultiPort 250D
2 Functionality
Kamstrup M-Bus Master MultiPort 250D is an M-Bus master designed for the connection of up to 250 meters with
M-Bus interface. The cable length of a master can be up to 2800 m depending on cable type.
The master supports primary, secondary and enhanced secondary addressing. Enhanced secondary addressing is
supported when the master is used as level converter, not when reading via the display.
All inputs are galvanically separated from the M-Bus network.
When designing the master, it has been considered important that installation and analysis work can be effected
directly from the master without having to connect a PC with dedicated software.
Configured as a master, MultiPort 250D is operated via its display and the six front keys.
The display has been designed with a user-friendly menu structure, which makes it simple to perform scanning,
reading and analysis of the M-Bus network. Furthermore, the display currently provides information on network status
such as current communication and number of connected meters (Unit Loads).
Configured as a level converter, one or several of the integrated communication ports are connected to a reading
system, a control unit or similar. Communication is controlled from the connected units.
MultiPort 250D can be accessed from all available communication ports. The integral port controller prevents collision
in case of simultaneous communication through more than one port.
When the port controller detects communication on one port, communication on other ports becomes impossible.
When communication on one port is finished, all ports are open to communication.
The repeater function makes it possible to extend the size of the M-Bus network both as to number of meters and total
cable length. If one master and four repeaters are installed in a network, the total cable length can be extended to
approx. 14 km, and up to 1250 meters can be connected.
Kamstrup A/S • 5512853_C1_GB_01.2017
5
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