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Kamstrup A/S • 55121600_A4_GB_03.2015
MULTICAL® 6M2
Cable resistance
< 29 Ohm
Cable capacity
< 180 nF
The M-Bus network is connected to terminals
24 and 25. The polarity is unimportant.
M-Bus comes with pulse inputs.
10.2.3 Lon Works, type 67-00-24 (rev. A1 or higher)
The LON module is used for transfer of data from MULTICAL® 6M2 either for data reading or for ad-
justment purposes via the LON bus, which is ideal for i.e. climate control and building automation.
Data is communicated at a high speed which makes it possible to connect many applications to
the same LON network.
Cabling between the LON module and the other LON-nodes is made with a standard twisted pair
cable. The length can be up to 2700 m using bus topology or 500 m using free topology. The LON
module is built up as a separate network node with neuron chip, memory, transceiver and input/
output circuit. The module requires external supply (24 VAC /230 VAC) of MULTICAL® 6M2, battery
supply is not possible.
The LON module collects new data from MULTICAL® 6M2 in a cycle which secures that all data are
updated every 30 seconds.
10.2.4 BACnet®, type 67-00-66 (rev. J1 or higher)
The BACnet® module communicates with BACnet® on MS/TP via RS-485 as a master/slave or
slave device.
The BACnet® module transfers a number of both actual data and accumulated data. Furthermore,
info codes can be transmitted to the BACnet® Controller. The two pulse inputs allow connection
and reading of two additional meters for e.g. water and electricity with pulse output.
10.2.5 Modbus, type 67-00-67 (rev. B1 or higher)
The Modbus base module for MULTICAL® 6M2 ensures simple integration from Kamstrup’s heat,
cooling and water meters into a Modbus based system. The Modbus module communicates as
an RTU (Remote Terminal Unit) slave device on RS-485. The Modbus module transfers a number
of both actual data and accumulated data. The RS-485 port of the Modbus module is galvanically
separated from the meter’s voltage potential, thereby improving the security for smooth opera-
tions. At the same time, the risk of influencing the meter due to influences of the RS-485 port is
reduced to a minimum.
