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ConvBox
User Manual
Page 1 from 4
E100203219065
Baer Energie- & Messtechnik GmbH Siemensstr. 3 D-90766 Fürth Phone +49 911 970590 Fax +49 911 9705950
General
The converter box is a digital level converter in control
housing for top rail installation (width of four modules=70mm,
DIN 43880) with one RS232 interface. The box is used to
adapt physically two interfaces and to separate them
galvanicly (RS232 and M-Bus passive only). Two interface
slots can be used to plug in different modules. The level
converter is working fully transparent for transmission rates
between 300 and 9600 Baud.
Example:
Power supply
Options for power supply:
AC / Alternating voltage: 100 – 240VAC, 50 / 60Hz
DC / Direct voltage: 24VDC
Page 2 from 4
E100203219065
ConvBox
User Manual
Baer Energie- & Messtechnik GmbH Siemensstr. 3 D-90766 Fürth Phone +49 911 970590 Fax +49 911 9705950
Interfaces
Two interface slots can be used to plug in the following exchangeable modules as required:
RS232 interface (Service / on Board): to connect a modem or PC. The length of the cable must
not exceed 15m.
The RS232 can be use for error analysis of the devices connected (Rx signal).
Note: At the RS232 interface is possible to connect one device only: at the terminals
(Tx / GND / Rx) or at the service plug!
Note: Don’t use open (not connected) RS232 cables (antenna effect!).
M-Bus interface: (plug-in module: passive or active) for connection to the M-Bus cable. The
length of the cable can go up to 10km, depending on the cable and the number of devices
connected to it.
For small M-Bus systems the converter box can also be used as MiniMaster (M-Bus-Repeater) if
not more than 20 devices are connected: from RS232 (Service / on Board) to M-Bus (active).
RS485 interface (plug-in module: 2 or 4 wires): for connection to the RS485 bus. The length of
the cable must not exceed 1,2km and the maximum number of devices is limited to 32 within the
bus segment.
20mA/CS current loop (plug-in module: passive or active). The length of the cable must not
exceed 1km. Up to 3 devices can be connected to the bus segment.
The following conversions are possible:
to (OUT)
from (IN)
M-Bus
(active)
plug-in interface
20mA/CS
(passive)
plug-in interface
20mA/CS
(active)
plug-in interface
RS485
(2 wires)
plug-in interface
RS485
(4 wires)
plug-in interface
M-Bus
passive
plug-in interface
RS232
Service / on Board
M-Bus (passive)
plug-in interface
−
20mA/CS (passive)
plug-in interface
−
20mA/CS (active)
plug-in interface
RS485 (2 wires)
plug-in interface
LED
Three LEDs display the current operating status:
LED
Function
Description
Power
Power
Signals that the device is supplied with power
TxD
Send
Transmit data (OUT): lights when data is transferred
RxD
Receive
Receive data (OUT): lights when data is transferred
ConvBox
User Manual
Page 3 from 4
E100203219065
Baer Energie- & Messtechnik GmbH Siemensstr. 3 D-90766 Fürth Phone +49 911 970590 Fax +49 911 9705950
Terminal assignment
Terminal
Description
N
Neutral conductor
L
Line (110VAC – 240VAC)
−
−24VDC (alternative)
+
+24VDC (alternative)
GND
RS232 (Service): ground
Tx
RS232 (Service): transmit
Rx
RS232 (Service): receive
a+
IN
+M-Bus passive / +RS485
−20mA/CS active / +20mA/CS passive
b−
IN
−M-Bus passive / −RS485
+20mA/CS active / −20mA/CS passive
A(+)
OUT
+M-Bus active/passive / +RS485
−20mA/CS active / +20mA/CS passive
B(−)
OUT
−M-Bus active/passive / −RS485
+20mA/CS active / −20mA/CS passive
Z−
OUT: −RS485 (4 wires only)
Y+
OUT: +RS485 (4 wires only)
The valid terminal connection is always displayed at the terminal block of the device!
Dimensions
Page 4 from 4
E100203219065
ConvBox
User Manual
Baer Energie- & Messtechnik GmbH Siemensstr. 3 D-90766 Fürth Phone +49 911 970590 Fax +49 911 9705950
Subject to change without notice!
Technical Data:
Housing:
Control housing for top hat rail installation (DIN 43880)
Degree of protection:
IP20 (IEC)
Protection class:
2
Temperature range:
-25°C to +60°C (operational)
-40°C to +85°C (storage temperature)
Dimensions:
Ca. 70mm 90mm 62mm (W H D), 4 width units
Nominal voltage:
(alternative)
100VAC to 240VAC (± 10%), terminals: L and N
or
24VDC (± 10%), terminals: + and −
Power consumption:
AC: max. 5VA
DC: max. 3VA
Service interface:
RS232
Interface 1 (Input / IN):
M-Bus passive;
20mA/CS passive or active;
RS485 2 wires;
Interface 2 (Output / OUT):
M-Bus active for max. 20 slaves / meters á 1,5mA or passive;
20mA/CS passive or active;
RS485 (2 or 4 wires);
Baud rate:
300 to 9600 Baud, (7E1, 8N1, 8E1...)
Transmission protocol:
All protocols are possible (transparent data transmission, level converter)
Galvanic isolation:
For RS232 and M-Bus passive (Input / IN)
Display:
3 LEDs for power and data transmission
Extent of delivery:
ConvBox with RS232 service interface;
Interface module as ordered;
Accessories:
Additional interface modules;
M-Bus Master / Repeater / MiniMaster
/
