6
07.03.02, Version 1.2
User manual MR004DL/FA
GmbH, Stettiner Str. 38, D-33106 Paderborn
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: Voltage: 230VAC, 50Hz, 25W respective
110VAC, 50Hz, 25W (-US version)
Environment: Operating temperature: 0..+45°C
Storage temperature: -10..+60°C
Humidity: 10..70% (non condensing)
Housing: Dimensions: W x H x L = 166 x 190 x 112 (mm)
Protective class: IP53 (cable glands must be closed)
Material / colour: PS / light-grey (similar to RAL 7035)
Weight: 1,3kg
M-Bus specifications
Parameter
min.
typ.
max.
unit
Max. no. of unit loads (slaves)
60
Internal resistance
15
Ω
Bus voltage mark = log. 1 (@ 0mA)
38,5
39,0
39,5
V
Voltage drop for space = log. 0
12
12,5
13
V
Warning current level (Max LED)
90
100
110
mA
Level for over current interruption (Short LED)
130
140
160
mA
Level for bit detection from slave
7
mA
Level for collision detect
30
mA
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.
