User Manual
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Building Technologies M-bus System CE1P5361en
HVAC Products 2 System components 08.02.2007
The device list is stored in nonvolatile memory.
For detailed information about the search run, refer to section 8.3 "Search run of central
units OZW10 and OZW111".
The M-bus central unit offers a number of choices for reading the M-bus and Sie-
meca™ AMR devices. It must be appropriately parameterized:
Readout cycle with manual querying: The data are read out via M-bus only when
requested
Readout cycle with periodic querying: The data are periodically and automatically
read out – hourly, daily, weekly or monthly. It should be noted however that in the
case of battery-powered M-bus devices, frequent readout can shorten the batter-
ies‘ life, depending on the type of device (e.g. SONOGYR
®
and MEGATRON
®
, but
not SONOHEAT
®
2WR4 and 2WR5). If such devices are used by the system, no
more than 1 reading per day is normally permitted. For details, refer to the specifi-
cation of the relevant product
Alarm cycle (V3.0 or higher): For monitoring, controllers can be queried more fre-
quently. The alarm cycle can be set at increments of minutes
All data known to the M-bus central unit are stored in an internal process image and
prepared for further handling. Siemeca™ AMR devices send their data periodically to
the radio nodes WTX16 or WTT16. The OZW10 uploads the data stored in the radio
nodes.
The M-bus central unit stores the data of all M-bus and Siemeca™ AMR devices last
read. They can be read out at the M-bus central unit. To handle them on a PC, the data
can be transferred as follows:
The data are made available via the RS-232 port as a billing file. They can then be
read out with the help of the ACS7… PC software, either directly or via modem
The data are transferred to a memory card in the form of a billing file. The M-bus
central unit has a slot to insert the memory card. The memory card is forwarded to
the billing agency, which loads the data directly to the PC via the RS-232 port us-
ing a second M-bus central unit OZW10 and the ACS7… PC software
For a description of the billing file, refer to section 8.5 "Billing file".
Readout
Evaluating the
consumption data