User Manual

34/90
Building Technologies M-bus System CE1P5361en
HVAC Products 2 System components 08.02.2007
2.3.4 Communication
For detailed information about the communication between ACS… and OZW…, refer to
section 6.1 "Communication between ACS7… and OZW…".
In the case of a direct connection, a null modem 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.
2.3.5 Equipment combinations
The OZW111 has its M-bus power supply integrated and requires no additional M-bus
signal converter. A maximum of 5 M-bus devices can be connected to the M-bus cen-
tral unit.
M-bus mini plant Maximum
number
Type
reference
Data Sheet
M-bus central unit 1
OZW111
N5363
M-bus devices 5*
* The SONOHEAT
®
heat meters with an M-bus module up to V1.06 produce a bus load
of 1.5 standard loads. For this reason, this type of meter produces a load of 1.5 M-bus
devices on the M-bus. Hence, a maximum of 5/1.5 = 3 SONOHEAT
®
heat meters with
an M-bus module up to V1.06 can be connected to an OZW111.
All other devices and SONOHEAT
®
heat meters with an M-bus module of V2.01 or
higher represent 1 M-bus standard load.
2.4 M-bus signal converter WZC-P250
2.4.1 Introduction
The M-bus signal converter converts RS-485 signals to M-bus signals.
2.4.2 Use
The M-bus signal converter serves for the connection of an M-bus central unit with an
RS-485 port to the M-bus.
2.4.3 Functions
The M-bus signal converter
 converts the RS-485 signals to M-bus signals
 operates as a bus driver.
2.4.4 Equipment combinations
The M-bus signal converter is for connection to the RS-485 port of the OZW10 (refer to
section 2.2 "M-bus central unit OZW10").
A maximum of 250 M-bus devices can be connected to the M-bus signal converter.
Direct connection
Telephone connection
Note