HZS 7321
TOUCH OPERATING PANEL
Page 28
04.09.2020
10 M-Bus
The M-bus (meter bus) is used to recording consumers. The data are serially transmitted
from the measurement device to the master over a 2-wire connection.
The M-bus is standardized to the European norm EN13757.
10.1 M-Bus Number of Participants
The maximum number of participants on the M-bus depends on the cable length, data trans-
fer rate (Baud rate) and the drivers used in the participants.
On the HZS 7321, a maximum of 10 M-bus participants can be used. Each with 6 Unit Loads.
10.2 M-Bus Baud Rate
The M-bus supports the following Baud rates: 300, 600, 1200, 2400, 4800 and 9600 Baud.
10.3 M-Bus Topology
The M-bus can be configured in star, line and tree topologies.
10.4 M-Bus Addressing
The M-bus uses a defined range of addresses for communication with remote stations, which
are composed as follows:
Address
Usage
0-250
Device addresses
251-252
Reserved
253
Use of secondary addressing
254
Sends a broadcast to all devices with the request for acknowledgement / answer
255
Sends to all M-bus devices without requesting an answer.
Via the address 253, a secondary addressing is possible. This allows a large range of ad-
dresses or participants.
