LOYTEC L-MBUS20 User manual

L-MBUS20/L-MBUS80
M-Bus Level Converter
User Manual
LOYTEC electronics GmbH

Contact
LOYTEC
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A-1170 Vienna
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[email protected]
http://www.loytec.com
Version 1.0
Document №88077901
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EXPRESS, IMPLIED, STATUTORY OR IN ANY COMMUNICATION WITH YOU,
AND
LOYTEC SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. THIS
PRODUCT IS NOT DESIGNED OR INTENDED FOR USE IN EQUIPMENT
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L-MBUSis trademark of LOYTEC electronics GmbH.

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Contents
1Introduction..................................................................................................5
1.1 Overview..............................................................................................................5
1.2 Scope.....................................................................................................................5
2Hardware Installation..................................................................................6
2.1 Enclosure .............................................................................................................6
2.2 Product Label......................................................................................................7
2.3 Mounting..............................................................................................................7
2.4 Connectors, LEDs, Wiring.................................................................................8
2.5 LED signals..........................................................................................................9
2.5.1 Power LED ................................................................................................9
2.5.2 Short LED..................................................................................................9
2.6 Operating Mode..................................................................................................9
2.7 Terminal Layout and Power Supply.................................................................9
2.8 Wiring ................................................................................................................10
2.8.1 Wiring of TTL level interface Port 1 .......................................................10
2.8.2 Wiring of RS-232 level interface Port 2 ..................................................10
2.8.3 Wiring M-Bus network............................................................................11
3Troubleshooting..........................................................................................13
3.1 Technical Support.............................................................................................13
4Specifications ..............................................................................................14
4.1 L-MBUSxx.........................................................................................................14
4.1.1 Physical and Electrical Specifications ..................................................... 14
5Order Information .....................................................................................15
5.1 L-MBUSxx.........................................................................................................15
6Revision History .........................................................................................16

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Abbreviations
M-Bus................................. Meter-Bus
RXD ................................... Receive Data
TXD.................................... Transmit Data

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1 Introduction
1.1 Overview
The L-MBUS20 and L-MBSU80 are level converters between RS-232 level or TTL level
UART signals and an M-Bus network. The L-MBUS must be connected to an M-Bus
master interface. The L-MBUS20 can read up to 20 M-Bus slave devices and the
L-MBUS80 can read up to 80 M-Bus slave devices.
1.2 Scope
This document covers L-MBUS devices.
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2 Hardware Installation
2.1 Enclosure
The L-MBUSxx enclosure according to DIN 43880 is 107 mm wide and prepared for
mounting on rails according to DIN 50022 (see Figure 1).
Figure 1: L-MBUSxx Enclosure (dimensions in mm)
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2.2 Product Label
The product label on the side of the L-MBUSxx contains the following information (see
Figure 1):
L-MBUS20 or L-MBUS80 Order Number,
Serial Number with bar-code (SER#),
Production Date.
Unless stated otherwise, all bar codes are encoded using “Code 128”. An additional label is
also supplied with the L-MBUSxx for documentation purposes.
2.3 Mounting
The device comes prepared for mounting on DIN rails following DIN 50 022. The device
can be mounted in any position. However, an installation place with proper airflow must be
selected to ensure that the L-MBUSxx’s temperature does not exceed the specified range
(see Chapter 4).
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2.4 Connectors, LEDs, Wiring
Figure 2: L-MBUSxx connectors, LEDs, wiring
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2.5 LED signals
2.5.1 Power LED
The L-MBUSXX power LED lights up green when power is supplied to terminals
“POWER”.
2.5.2 Short LED
The L-MBUSXX is equipped with a red Short LED (see Figure 2). This LED is normally
off.
If the M-Bus is shorted or overloaded, the Short LED lights up red.
2.6 Operating Mode
The L-MBUSxx level converter can be connected to
a) RS-232 level UART interface
b) TTL level UART interface
The selection is done with the jumper JMP according to the table below.
Jumper JMP Function
Installed TTL level interface is active
Not Installed RS-232 level interface is active
Table 1: L-MBUSxx jumper setting for operating mode selection.
2.7 Terminal Layout and Power Supply
The L-MBUSXX provides pluggable screw terminals to connect to the network as well as
to the power supply. The screw terminals can be used for wires of a maximum thickness of
1.5 mm2/AWG12. The device can either be DC or AC powered. The connectors are shown
in Figure 2
Terminal Function
1,2 Power Supply 24 VDC or 24 VAC
3,4,5 TTL level UART interface to M-Bus master
8,9 M-Bus network connector
PORT2 RS-232 level UART interface to M-Bus master
Table 2: L-MBUSxx Terminals
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2.8 Wiring
2.8.1 Wiring of TTL level interface Port 1
If the L-MBUSxx is connected to an M-Bus master with TTL level interface e.g. LINX-
120, LINX-121, LINX-220, LINX-221, LROC-150, the wiring must be done as shown
below. Make sure jumper JMP is installed. The maximum cable length is 0.3 m.
PORT 1 Function
3 TTL level GND
4 TTL level TXD (input)
5 TTL level RXD (output)
Table 3: Connecting the L-MBUSxx via TTL level UART interface Port 1.
Figure 3: Wiring of L-MBUSxx with TTL level interface M-Bus master.
2.8.2 Wiring of RS-232 level interface Port 2
If the L-MBUSxx is connected to an M-Bus master with RS-232 level interface the wiring
must be done as shown below. A null-modem cable is required to connect the L-MBUSxx
to a PC or a LINX-100, LINX-101, LINX-110, LINX-111, LINX-200, LINX-201,
LINX-210, LINX-211. Make sure jumper JMP is removed. The maximum cable length is
1 m.
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