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Smart M-Bus to Ethernet gatewaypwr

HWg-PWR is a smart Ethernet gateway for remote energy metering and consumption monitoring. To measure the consumption of water, electricity and other energies, external meters with the M-Bus interface are used.

Up to 3 / 12 / 25 M-Bus meters can be connected to the HWg-PWR unit. Individual meters (electricity meter, water meter, gas meter, heat meter etc.) are produced by third parties and connected via their M-Bus interface.

HWg-PWR is a smart gateway that monitors energy consumption and warns about abnormal values The unit provides a Web interface, charts, SNMP and Modbus/TCP output, data logging, e-mail and SMS alerts, and much more.



Product Parameters

Product Parameters

  • Ethernet: RJ45 (100 Mbit)
  • WEB:Built-in Web server, charts
  • Data input:3 / 12 / 25 external meters equipped with the M-Bus (EN 13757-2) interface
    • M-Bus power: Meters powered from HWg-PWR
    • M-Bus standards: EN 13757-2 (physical layer) & EN 13757-3 (application layer)
    • Variables (data points): Up to 100 different variables from all (max. 25) meters
    • M-Bus: Automatic detection of meters and available values
  • Digital inputs: 8x Digital Input for 110/230V phase failure detection (senses tripped circuit breakers)
  • Data logging: 170,000 values (3 values every 15 minutes = 590 days)
  • Power: 110 or 230V AC
  • Mechanical: Fits on a DIN rail
  • M2M communication protocols: SNMP, XML, Modbus/TCP
  • Response to thresholds: SNMP trap, E-mail, SMS (via SMS-GW)
  • Portal: HWg-Push protocol, supports
  • Graphs: Logging of values with the option to plot graphs
  • Counter: Independent counter for periodic consumption readouts (daily, weekly, monthly, annually, ...)
  • Report: Periodic e-mailing of measured values
  • SMS Gateway: Device can send SMS by external "HWg-SMS-GW" without any software.
  • Support for programmers: HWg SDK 

Supported software

  • HWg-Trigger: Control of other IP devices, alarm redirection to SMS
  • HWg-PDMS: Logging, export to MS Excel
  • Third-party SNMP software 
  Inputs Power Web M2M outputs
  M-Bus meters M-Bus variables Digital inputs Modbus/TCP
SMS GW E-mail E-mail report HWg-Push
HWg-PWR 3 3 Max 100 8x 110/230VAC 110/230VAC ano ano ano ano ano ano
HWg-PWR 12 12 Max 100 8x 110/230VAC 110/230VAC ano ano ano ano ano ano
HWg-PWR 25 25 Max 100 8x 110/230VAC 110/230VAC ano ano ano ano ano ano
HWg-PWR 3 Max 30 3x Dry Contact 230V ano - - ano ano -


Where to use

Where to use

  • External M-Bus meters (third-party products)
    • Values available over M-Bus depend on the meter – we recommend to always check the supported values with the manufacturer!
    • Support for certified and calibrated meters
    • Support for single-phase and polyphase electricity meters
    • Support for single-tariff and multi-tariff meters
    • Current transformers enable measurements of high currents
    • Examples of typically available values:
      • Instantaneous power input
      • Total consumption
      • Line voltage
      • Line current
      • Power factor (cos φ)
      • Flow speed

HWg-PWR25 M-Bus icon



Collecting data from 1 to 25 M-Bus electricity meters

M-Bus electricity meters to SNMP

  • Various energy meters (equipped with the M-Bus interface) are connected to the HWg-PWR unit.
  • All values are available to external software over LAN and SNMP.
  • Energy consumption details can be viewed using the Web interface or an iPhone or Android app.

Server room: Energy consumption monitoring + phase outage detection

Datacenter M-Bus energy monitoring SNMP

  • Up to 25 electricity meters measure the single-phase or three-phase consumption of the cabinets.
  • Up to 8 inputs can detect phase outages.
  • When a phase fails, a warning can be e-mailed.
  • Upon an alarm (phase failure or current out of range), a text message alert can be sent to a mobile phone via an external SMS Gateway.
  • Energy consumption data can be connected to any SCADA system (Modbus/TCP) or accessed over SNMP.

Measuring energy consumption with S0 pulses and M-Bus meters

S0 pulses M-Bus energy metering

  • Modern electricity meters with the M-Bus interface can be connected to HWg-PWR directly.
  • Older electricity meters with a S0 pulse output can be connected using a “S0-M-Bus” converter.
  • Current consumption charts are available through the HWg-PWR web interface.
  • Every day, week or month, HWg-PWR e-mails a report. The e-mail contains a billing statement including KWh and a conversion to currency.
  • When the current consumption exceeds or drops below a set threshold, the unit sends an e-mail alert.

Remote energy metering with a central WEB portal

residential Energy metering M-Bus

  • Various energy meters are connected to a single HWg-PWR unit.
  • Each unit has a WEB interface for configuration, viewing logs, etc.
  • All consumption data are uploaded to a central portal using the HWg-Push protocol.
  • The central portal (e.g. SensDesk) generates detailed analyses and statistics concerning energy consumption.

Contact us

Vrážská 1418
153 00, Prague 5
Czech republic


Phone: (+420) 723 069 809
Fax: (+420) 773 553 054
E-mail: sales@st-hw.com 



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