Data transmission interface
The instrument is not powered by the M-Bus interface and is equipped with galvanic isolation. In
a M-bus network with a maximum of 250 instruments, it is possible to perform 24 readouts a day
for each instrument. If fewer readouts are carried out and/or if the number of instruments installed
in the network (connected to the M-Bus system) is lower, any unused requests will be stored in
the instrument to be used when needed.
Note:
•
During communication via M-Bus, the selection button cannot be used.
•
The M-Bus protocol complies with EN 13757-2, EN 13757-3, EN 1434-3 and M-Bus
recommendation (Version 4.8, November 1997) – protocol IEC 870 parts 1, 2 and 4.
•
None of the meters can withstand a voltage greater than that permitted by the bus voltage (±
50 V). Use a level converter/master as an additional protective measure.
•
The instruments can be installed in an M-Bus network by authorized and qualified personnel
only.
•
Make sure that the structure of the M-Bus network (length and diameter of the cables) is
compatible with the baud rate (2400 Baud) of the connected instruments.
•
Recommended cable: telephone cable J-Y (ST) Y2 x 2 x 0,8 mm
2
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LEAVE THIS MANUAL AS A REFERENCE GUIDE FOR THE USER
Safety information
CAUTION:
Failure to follow these instructions may result in personal injury or damage to
property.
The device must be installed, commissioned and serviced by qualified technical
personnel.
Make sure that all connecting fittings are watertight.
Water temperatures higher than 50°C may cause severe burns. When installing,
commissioning and servicing the heat meter, take the necessary precautions so
that these temperatures will not be hazardous for people.
NB: Failure to observe these instructions for proper installation can impair operation and invalidate
warranty.
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