RS485toMBus-4M
M-Port line
RS485 to M-Bus communication converter
This converter is no longer produced. It was replaced by RS485MBus-5M.
Application
Remote data retrieval from M-Bus devices via the RS485 serial communication line in industry and building automation. The most frequently used M-Bus slave devices are heat, water and electricity consumption meters.
Description
The RS485toMBus-4M converter provides a RS485 to M-Bus interface conversion. There is no change in the content of the messages or communication speed during the conversion. The maximum number of M-Bus slave devices that can be connected is five.
Main characteristics
M-Bus port
- Connection of 1 to 4 M-Bus slave devices.
- Surge protection guaranteeing superior durability against overvoltage.
- Current protection against overload and short circuit on the communication line with LED status indication.
Power supply
- Wide range of DC power supply voltage 7-28V.
- Overvoltage protection.
- LED indication of power supply.
RS485
- Signals: Data+, Data- and GND
- Protections against overvoltage.
- Selectable termination of the line with a 120R resitor.
- Galvanic separation from the M-Bus line.
Mechanical construction
- Plastic box with mounting on 35 mm DIN rail.
Differences from the RS485toMBus-5 converter
- Connection of 4 M-Bus slave devices.
- Smaller width on the DIN rail.
- Less powerful overvoltage protections on the M-Bus line and the power port.
- The power supply port does not have galvanic separation from the RS485 communications port.
- Only DC power supply.
- Less powerful M-Bus line driver. The maximum length of the M-Bus line is in the range of hundreds of meters.
- Smaller operating temperature range.
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.
| RS485 communication interface | |
|---|---|
| Communication signals | A (+ Tx/Rx), B (- Tx/Rx), GND |
| Protection | overvoltage protection TVS 600W |
| Terminating resistors | A 1kΩ to +5V, B 1kΩ to GND, between A & B 120Ω – JUMPER |
| Galvanic separation | 1kV from M-Bus line |
| Connector | terminal block with plug-in connector for wires of up to 2.5 mm² cross-section area |
| M-Bus Master communication interface | |
| Number of devices that can be connected | 1 to 4 SLAVE devices, idle current max. 6mA |
| Baud rate | 300 – 9600 bps |
| Protection | – overvoltage protection TVS 600W |
| – electronic protection against overloads and short circuit on the communication line | |
| note: converter can withstand sustained short circuit on the communication line | |
| Galvanic separation | 1kV from power supply and from RS485 line |
| 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 | 7V to 28V |
| Maximum limits of supply voltage – permanent operation at these voltages is not recommended | |
| Minimum DC power | 6.5V – minimal voltage necessary for the operation of the converter |
| Maximum DC power | 30V – above this the overvoltage protection will activate |
| Protection | – overvoltage protection TVS 600W |
| Power consumption | 0.3W to 1W. Depends on M-Bus line load and power supply. |
| 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 | -20°C to 70°C |
| Mechanical construction | |
| Mechanical design | plastic box |
| Mounting | 35 mm DIN rail (EN 50022 top hat rail) |
| Dimensions: height x width x length | 58 x 36 x 95 mm |
| Protection classification | IP20 |
| Weight | 70g |
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 | ± 8 kV |
| 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 / ± 0.5 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.* | ± 2 kV / ± 1 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 shielded 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
Name / File
Date
Size
Manuals
Name / File
Date
Size
Contents
Typical application
Typical wiring of the converter with M-Bus devices, power supply and a RS485 serial communication link connection to a computer.
Connectors on the M-Bus side
| Connector | Type | |
|---|---|---|
| M-Bus | Connector for the M-Bus line. | SV-02-5.08 |
| Status LEDs | Color | |
| Transmit | Indication of transmission on the M-Bus line. | green |
| Receive | Indication of reception 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 RS485 side
| Connectors | Type | |
|---|---|---|
| Power | Connector for power supply. | SV-02-5.08 |
| RS485 | Connector for the RS485 interface. | SV-02-5.08 |
| Status LEDs | Color | |
| Power | Indication of correct power supply voltage. | green |
