EthMBus-XL SECURE
models 20, 45, 80, 120, 190
Ethernet to M-Bus communication converter
Ethernet converter with secure communication
Designed for remote secure communication with M-Bus meters using the Ethernet computer network in industry, building automation.
The converter works only as a transparent gateway for transfer of M-Bus messages using TCP or UDP Ethernet protocols. These protocols can be secured through encryption to ensure data confidentiality and integrity. Data from meters is therefore not visible and cannot be altered or tampered with during transmission over the Ethernet network. Data is available only through M-Bus protocol readout.
Main characteristics
The M-Bus converter features a processor controlled monitoring of internal state, power supply state and M-Bus line state. Operation and error states are indicated by status LEDs which simplify and make it easier to troubleshoot possible M-Bus communication errors.
M-Bus port
- Connection of 1 to 20, 45, 80, 120 or 190 M-Bus slave devices depending on converter model.
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.
- External voltage protection.
- Processor controlled monitoring of M-Bus line state with LED indication for various error states.
- Indication of M-Bus slave devices reply collision.
- Indication of slave devices presence on the M-Bus line.
- Indication of M-Bus line overload, short and capacitive overload.
Power supply
- Wide range of operating DC power supply voltages 12-30V (20-30V for the XL190 model).
- Overvoltage protection.
- Processor controlled monitoring of power supply voltage with indication of its correctness and errors.
Ethernet
- TCP, UDP,TCP/AES, UDP/AES, SSH and SSL/TLS protocols and virtual COM port software.
- 10/100BASE-TX ethernet port, RJ45 connector.
Security
- SSLv3 and SSHv2 in client-server mode, configurable certificate bit length
- AES, 3DES, and RC4 encryption
- SHA-1, MD5 authentication, user access list
- Supports TLS only up to TLS v1.2
Mechanical construction
- Aluminium box with mounting on 35 mm DIN rail.
Main software characteristics
Transparent gateway mode:
- TCP/IP connection in server mode – supports multiple simultaneous connections.
- TCP/IP connection in client mode – supports multiple simultaneous connections or their fallback backups.
- UDP connection in single or multiple clients mode.
Software functions
- Converter configuration only through HTTP/HTTPS web interface or by uploading an XML file.
- TCP and UDP communication in server and client modes with encryption and authentication options.
Differences from the EthMBus-XL SMART converter
- No SMART functions for independent readout, processing and export of M-Bus data.
- Higher power consumption.
- Support for multiple connections in TCP/IP client 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 communications interface | |
|---|---|
| Communications interface | 10BASE-T, alebo 100BASE-TX (auto-sensing) |
| Communication protocols | ARP, UDP, TCP, ICMP, AutoIP, DHCP, HTTP, HTTPS, BOOTP, SMTP, SSHv2, SSLv3, TLS1.0-1.2 |
| Connector | RJ45 |
| Compatibility | Ethernet: Version 2.0/IEEE 802.3 |
| M-Bus Master communication interface | |
| Number of attachable devices – XL20 | 1 to 20 SLAVE devices, idle current max. 30mA |
| Number of attachable devices – XL45 | 1 to 45 SLAVE devices, idle current max. 67.5mA |
| Number of attachable devices – XL80 | 1 to 80 SLAVE devices, idle current max. 120mA |
| Number of attachable devices – XL120 | 1 to 120 SLAVE devices, idle current max. 180mA |
| Number of attachable devices – XL190 | 1 to 190 SLAVE devices, idle current max. 285mA |
| Baud rate | 300 – 9600 bps |
| Protection | – overvoltage protection TVS 1500W |
| – electronic protection against external voltage | |
| – 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 | 12V to 30V, model XL190 20V to 30V |
| Maximum limits of supply voltage – permanent operation at these voltages is not recommended | |
| Minimum DC voltage | 11V – min. voltage required for converter operation |
| Maximum DC voltage | 31V – at higher the overvoltage protection starts to activate |
| Protection | – overvoltage protection TVS 1500W |
| – power supply polarity reversal protection | |
| Power consumption | 2.1W to 16.3W depends on converter model and number of M-Bus devices |
| Connector | terminal block with plug-in connector for wires of up to 2.5 mm2 cross-section area |
| Status LEDs | |
| Power – green | power indication. Indicates a converter malfunction when flashing. |
| Transmit – green | indication of data transmission on the M-Bus line |
| Receive – yellow | indication of data reception on the M-Bus line |
| Meters – yellow | indication of M-Bus meters on the line |
| Err./Coll. – red | indication of error, overload, collision on the M-Bus line |
| Note: For further details on LED indication see manual. | |
| Temperature | |
| Operating range | -40°C to 60°C |
| Mechanical construction | |
| Mechanical design | aluminium box |
| Mounting | 35 mm DIN rail (EN 50022 top hat rail) |
| Dimensions: height x width x length | 38 x 81.5 x 107 mm – without connectors |
| 38 x 81.5 x 125 mm – with connectors | |
| Protection classification | IP40 |
| Weight | 230g (XL20, XL45, XL80), 250g (XL120, XL190) |
EMC compatibility of the M-Bus converter has been tested according to the following standards for industrial environment.
| EMC emissions 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 | ± 8 kV |
| 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 / ± 500 V |
| 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. M-Bus line. | 10 V |
* test performed at the manufacturer’s request. The M-Bus port of the converter features an increased surge protection. This type of testing is not required when a shielded cable is used.
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
Name / File
Date
Size
Manuals
Name / File
Date
Size
Manual of network connections for SECURE converters
EthMBus_SECURE_connections_guide_v1_31_EN.pdf
Date:
5. 2. 2026
Size:
456 kB
Lantronix utilities
Name / File
SW application from Lantronix for advanced configuration of the converters
https://ltrxdev.atlassian.net/wiki/spaces/LTRXTS/pages/106070471/Latest+version+of+DeviceInstaller
SW application for creating a virtual COM port from Lantronix
https://ltrxdev.atlassian.net/wiki/spaces/LTRXTS/pages/106856722/Latest+version+of+the+SCPR+Secure+Com+Port+Redirector
SW application for creating a virtual COM port from Lantronix
https://papouch.com/lantronix-secure-com-port-redirector-p7194/
Contents
Typical application
Typical wiring of the converter with M-Bus devices, power supply and a computer connection via Ethernet.
LED indication
Operational states indication
| Status LEDs | State |
|---|---|
| Power LED turned on | Converter and power supply is alright. |
| Transmit LED flashing | Data is transmitted to the M-Bus line. |
| Receive LED flasing | Data is received from the M-Bus line. |
| Meters LED turned on | Load on M-Bus line. Meters are connected to the line. |
| Meters LED turned off | Disconnected M-Bus line. No meters are connected to the line. |
| Fast flashing Meters LED | Max. amount of meters on M-Bus line reached (2 meters tolerance). |
Malfunction states indication
| Status LEDs | State |
|---|---|
| Power LED flashing | Internal converter error. |
| Power LED flashing + turned on Err./Coll. LED | External voltage on M-Bus line or Internal converter error. |
| Err./Coll. LED flashing or turned on | Converter overload – too many meters, short on the M-Bus line or capacitive overload on M-Bus line (C of line >5μF). When turning on the power – capacitive overload on M-Bus line (C of line >1μF). Increased capacitance may be caused by meters during power up. Capacitance can afterwards fall bellow 1μF. |
| Err./Coll. LED turned on for a short while | During data reception – flashing Receive LED. Communication collision. Simultaneous reply from multiple meters. During data transmission – flashing Transmit LED. An error occurs during transmission (incorrect voltages on the M-Bus line). Internal converter error or capacitive overload on M-Bus line. |
Connectors on the Power Supply and Ethernet side
| Connectors | Type | |
|---|---|---|
| Power | Connector for power supply. | SH-02-5.08 |
| V+ Positive pole of the DC power supply voltage. | ||
| V- Negative pole of the DC power supply voltage. | ||
| ⏚Earth ground. | ||
| Ethernet RJ45 | Connector for Ethernet cable connection. | RJ45 |
| Status LEDs | Color | |
| Link | Network connection state. Turns on when a network connection is available. | green |
| Rx/Tx | Network communication activity. Flashes only during data transfer. | yellow |
