EthMBus-5 LITE
Ethernet to M-Bus communication converter
Basic Ethernet converter.
Designed for remote communication with M-Bus meters using the Ethernet computer network in building or home automation and similar applications.
The converter works only as a transparent gateway for transfer of M-Bus messages using TCP or UDP Ethernet protocols. Data is available only through M-Bus protocol readout. Data is available only through M-Bus protocol readout.
Main characteristics
M-Bus port
- Connection of 1 to 5 M-Bus slave devices.
The most commonly used devices are heat, water, gas and electricity consumption meters. - Surge protection warranting above standard level of protection against overvoltage.
- Current protection against overload and short circuit on the communication line with
LED status indication.
Power supply
- Wide range of power supply voltages. DC 9-39.5V or AC 9-27.5V.
- Overvoltage protection and resettable current fuse.
- LED power supply indication.
Ethernet
- TCP, UDP protocols and virtual COM port software.
- 10/100BASE-TX ethernet port, RJ45 connector.
Mechanical construction
- Aluminium box with mounting on 35 mm DIN rail.
Main software characteristics
Transparent gateway mode:
- TCP/IP connection in server mode – option for multiple simultaneous connections.
- TCP/IP connection in client mode.
- UDP connection in single or multiple clients mode.

Software functions
- Converter configuration through web interface.
- TCP and UDP communication in server and client modes.
Main differences from the EthMBus-5 SMART converter
- No SMART functions for independent readout, processing and export of M-Bus data.
- Lower power consumption.
- Support for multiple connections in TCP/IP server mode.
- Doesn’t provide Telnet interface for configuration.
- Doesn’t provide logging of Ethernet activity and error states.
- No options for backup IP addresses for establishing TCP/IP connection.
Guarantee of quality
- Each converter passes through several functional electrical tests during the production.
Additionally a communication test is performed after final assembly. - EMC certification in an accredited laboratory for industrial environment.
- Solid design and construction based on many years practical experience.
| Ethernet communication interface | |
|---|---|
| Communications interface | 10BASE-T or 100BASE-TX (auto-sensing) |
| Communication protocols | ARP, UDP, TCP, ICMP, AutoIP, DHCP, HTTP |
| Connector | RJ45 |
| Compatibility | Ethernet: Version 2.0/IEEE 802.3 |
| M-Bus Master communication interface | |
| Number of devices that can be connected | 1 to 5 SLAVE devices, idle current max. 7.5mA |
| Baud rate | 300 – 9600 bps |
| Protection | – overvoltage protection TVS 1500W |
| – electronic protection against overloads and short circuit on the communication line | |
| note: converter can withstand sustained short circuit on the communication line | |
| Galvanic separation | up to 1kV from power supply, more than 1kV from Ethernet |
| Connector | terminal block with plug-in connector for wires of up to 2.5 mm² cross-section area |
| Power supply | |
| Recommended range of power supply voltages | |
| DC power supply | 9V to 39.5V |
| AC power supply | 9V to 27.5V |
| Maximum limits of supply voltage – permanent operation at these voltages is not recommended | |
| Minimum power | 8.5V DC, 8.5V AC |
| Maximum power | 42.5V DC, 29.5V AC |
| Protection | overvoltage protection TVS 1500W overcurrent protection with a 0.3A resettable PTC fuse |
| Power consumption | 1.7W to 3W* depending on load and power supply *short on the M-Bus line |
| Connector | terminal block with plug-in connector for wires of up to 2.5 mm² cross-section area |
| Status LEDs | |
| Power – green | indication of connected supply voltage |
| Transmit – green | indication of data broadcasting on the M-Bus line |
| Receive – yellow | indication of data reception on the M-Bus line |
| Overload/Short – red | indication of M-Bus line overload – flashing (idle current > 8mA) |
| indication of short on the M-Bus line – turned on (resistance of the line < 500Ω) | |
| Temperature | |
| Operating range | 0°C to 60°C |
| Mechanická konštrukcia | |
| Mechanical design | aluminium box |
| Mounting | 35 mm DIN rail (EN 50022 top hat rail) |
| Dimensions: height x width x length | 33 x 57 x 87 mm – without connectors |
| 33 x 57 x 106 mm – with connectors (M-Bus and Power plug-in connectors in the terminal blocks) |
|
| Protection classification | IP40 |
| Weight | 136g |
EMC compatibility of the M-Bus converter has been tested according to the following industrial environment standards.
| EMC emission tests | ||
|---|---|---|
| Standard | Test | Level |
| EN 55011 | Power line – CONDUCTED EMISSIONS 10/150 kHz – 30 MHz | Class A |
| EN 55011 | RADIATED EMISSIONS (Electric Field) 30 MHz – 1000 MHz | Class A |
| EMC immunity tests | ||
|---|---|---|
| Standard | Test | Level |
| EN 61000-4-2 | ELECTROSTATIC DISCHARGE (ESD) – Contact discharge | ± 4 kV |
| EN 61000-4-2 | ELECTROSTATIC DISCHARGE (ESD) – Air discharge | ± Information sheet |
| EN 61000-4-3 | RADIATED RADIO-FREQUENCY ELECTROMAG. FIELD 80MHz – 1GHz | 10 V/m |
| EN 61000-4-3 | RADIATED RADIO-FREQUENCY ELECTROMAG. FIELD 1.4GHz – 2GHz | 10 V/m |
| EN 61000-4-3 | RADIATED RADIO-FREQUENCY ELECTROMAG. FIELD 2GHz – 2.7GHz | 3 V/m |
| EN 61000-4-4 | ELECTRICAL FAST TRANSIENT/BURST – Power line | ± 4 kV |
| EN 61000-4-4 | ELECTRICAL FAST TRANSIENT/BURST – M-Bus line | ± 4 kV |
| EN 61000-4-5 | SURGE IMMUNITY – Power line. Common/differential mode. | ± 1 kV / ± 1 kV |
| EN 61000-4-5 | SURGE IMMUNITY – M-Bus line. Cable shielding. | ± 4 kV |
| EN 61000-4-5 | SURGE IMMUNITY – M-Bus line. Common/differential mode.* | ± 4 kV / ± 2 kV |
| EN 61000-4-6 | CONDUCTED DISTURBANCES, INDUCED BY RADIO-FREQUENCY FIELDS 0.15MHz – 80 MHZ. Power line and M-Bus line. | 10 V |
* test carried out at the request of the manufacturer. The M-Bus port has an increased durability against overvoltage. Carrying out this type of test is not required with the use of shield cable.
End user
Price list for individuals and companies which do not buy converters for resale.
Integrator
Price list for companies which buy converters for the purpose of resale to their custommers as manufacturers or suppliers.
The price list is available only to registered business partners.
Registration request.
Leaflet
Manuals
Lantronix utilities
Application that can be used to create a virtual serial port - USR-VCOM
Warning: The USR-VCOM application doesn’t work with SMART converters. Those use a different application to provide this type of functionality.
Contents
Typical application
Typical wiring of the converter with M-Bus devices, power supply and Ethernet network connection to a computer.
Connectors on the M-Bus side
| Connector | Type | |
|---|---|---|
| M-Bus | Connector for connecting M-Bus line. | SH-02-5.08 |
| Status LEDs | Color | |
| Transmit | Indication of broadcasting on the M-Bus line. | green |
| Receive | Indication of receiving on the M-Bus line. | yellow |
| Overload/Short | Indication of overload or short circuit on the M-Bus line. | red |
| – during overload the LED flashes alternately with Receive LED, I > 8mA | ||
| – short circuit is indicated with the LED turned on permanently, resistance of the M-Bus line < 500Ω | ||
Connectors on the Power Supply and Ethernet side
| Connectors | Type | |
|---|---|---|
| Power | Connector for power supply and earth ground. | SH-02-5.08 |
| Ethernet RJ45 | Connector for Ethernet. | RJ45 |
| Status LEDs | Color | |
| Power | Indication of correct power supply voltage. | green |
| Link | Network connection status. Turned on when network connection is available. | green |
| Rx/Tx | Network activity. Turns on only during communication, data transfers. | yellow |









