User Manual

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Building Technologies M-bus System CE1P5361en
HVAC Products 2 System components 08.02.2007
2.2.4 Communication
For detailed information about communication between ACS… and OZW…, refer to
section 6.1 "Communication between ACS7… and OZW…".
In the case of a direct connection, a standard null modem cable is required between M-
bus central unit and PC.
In the case of a connection via the telephone network, a Hayes-compatible modem is
required on each side.
2.2.5 Equipment combinations
The M-bus central unit has an RS-485 port. To be able to connect the central unit to the
M-bus devices, an external signal converter is required. It must be connected to the
RS-485 port of the central unit:
 WZC-P250 (Data Sheet N5365) for 250 M-bus devices, can be combined with re-
peaters WZC-R250 (Data Sheet N5366), or
 WZC-P60 (Data Sheet N5382) for a maximum of 60 M-bus devices (V3.0 or
higher)
Type of device Maximum
number
Type
reference
Data
Sheet
M-bus central unit 1
OZW10
N5362
M-bus signal converter for a maximum of 250
devices, or
1
WZC-P250
N5365
M-bus signal converter for a maximum of 60
devices
1
WZC-P60
N5382
M-bus repeater for a maximum of 250 devices Unlimited
1)
WZC-R250
N5366
M-bus devices 750
2)
1) In combination with the WZC-P250. For more information, refer to chapter 5 "Engineering"
2) The number of M-bus devices in dependent on the number of device types connected. For information
about calculation, refer to chapter 5 "Engineering"
For more information about the signal converters, refer to sections 2.4 "M-bus signal
converter WZC-P250" and 2.5 "M-bus signal converter WZC-P60".
The M-bus central unit reads certain data cyclically from the connected M-bus and
Siemeca™ AMR devices and stores them until the next readout is made. Depending on
the type of device, the OZW10 makes other data available. A description of these data
is given in section 8.5 "Billing file".
If readout of the consumption data is not made via RS-232 port or modem, it can also
be made via memory card:
Type of memory card Type reference
Memory card 128 KB
ALC30.128
Memory card 512 KB
ALC30.512
The M-bus central unit is operated on site with the help of the ARG10.DE operating set,
which consists of:
Type of document Document no.
Operating Manual U5362
Popcards B5362
Direct connection
Telephone connection
Signal converter
Functions in connection
with M-bus devices
Accessories