Description Of The M-Bus Level Converter - Relay MR004C User Manual

2 Description of the M-Bus Level Converter

Functionality:
The RS232C and RS485 interface signals are directly connected to the M-Bus all the
time besides during the operation via keyboard, the remote access using the command
menu and the automatic readout. External connected controllers (laptop, building
control systems ..) can use the device during the inactivity as a level converter for the
physical layer of the M-Bus. The software of the controller must provide the
communication protocols of the connected meters. The members of the W60 family are
able to supply up to 60 slaves (unit loads) with power.
Technical data
Supply:
Environment:
Housing:
Weight:
M-Bus specifications
Parameter
Max. no. of unit loads (slaves)
Internal resistance
Bus voltage mark = log. 1 (@ 0mA)
Voltage drop for space = log. 0
Warning current level (Max LED)
Level for over current interruption (Short LED)
Level for bit detection from slave
Level for collision detect
1 unit load = 1.5mA
The device transmits a break signal (space) for minimum 50ms after a collision and for
minimum 100ms after a short circuit.
6 07.03.02, Version 1.2
GmbH, Stettiner Str. 38, D-33106 Paderborn
Voltage:
Operating temperature:
Storage temperature:
Humidity:
Dimensions:
Protective class:
Material / colour:
1,3kg
230VAC, 50Hz, 25W respective
110VAC, 50Hz, 25W (-US version)
0..+45°C
-10..+60°C
10..70% (non condensing)
W x H x L = 166 x 190 x 112 (mm)
IP53 (cable glands must be closed)
PS / light-grey (similar to RAL 7035)
min. typ.
60
38,5 39,0
12 12,5
90 100
130 140
7
30
User manual MR004DL/FA
max. unit
Ω
15
39,5 V
13 V
110 mA
160 mA
mA
mA