Relay MR005DL - Description of the Level Converter

User Manual MR005FA+DL / MR006FA+DL ·04/2018 · VERSION 1.4
7
MR005FA+DL / MR006FA+DL
3 Description of the Level Converter
Function:
The RS232C interface signals are directly connected to the M-Bus all the time except during the
operation by keyboard, the remote access using the command menu and the automatic readout.
External connected controllers (laptop, building control systems etc.) 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 MR005 family are able to supply up to 3, the members of the MR006 family up to 20 slaves
(unit loads) with power.
Technical Data
Supply: Voltage: 10..28VDC, 5W
13..28VAC, 9W
Environment: Operating temperature: 0..+45°C
Storage temperature: -10..+60°C
Humidity: 10..70% (non condensing)
Housing: Dimensions: W x H x L = 105 x 94 x 58 (mm)
Protective class: IP20
Material / colour: Noryl / light-grey (similar to RAL 7035)
Weight: 0,23kg
M-Bus specifications
Parameter
min.
Typ.
max.
Einheit
Max. no of unit loads (slaves): MR005FA/DL
3
Max. no of unit loads (slaves): MR006FA/DL
20
Internal resistance
100

Bus voltage mark (@ 0mA)
29.0
30.5
32.0
V
Voltage drop for space = log. 0
12
12,5
13
V
Level for overcurrent interruption
50
60
70
mA
Level for bit detection from slave
7
mA
1 unit load = 1,5mA