WM Systems - Innovation in Smart IoT SystemsNarrow Band Modem for Elster / Honeywell Alpha meters - WM Systems LLC - Innovation in Smart IoT systems : WM Systems LLC – Innovation in Smart IoT systems

External, industrial modem with serial port and Narrow-Band communication for Elster®/Honeywell® electricity meters – mountable to C-rail.

The modem has wireless data transmitting capabilities and RS232/RS485 data connection.

Suitable for remote meter readout, meter data download and configuration on the provider’s request.

Design and connectivity satisfies the vendor meter standard.

It is part of the AMI (Advanced Metering Infrastructure) of the utility company.


• Supporting Narrow-Band IoT Cat.M1 and Cat.NB1 (Telit® modem)
• RS232/RS485 (upon request), transparent link


• WM-E Term® tool, optional DMSet® software
• Immediate alarm notification
• „Push” data sending (Ftp or IEC data push, by SMS triggering)
• Scheduled data sending or triggered by alarm
• Remote & safe firmware updates

Design & Construction

• Separated and sealed isolation from the meter
• Compatible with Elster® A1500 Alpha, A1800 Alpha, A1140 Alpha, A1160 Alpha, A1700 Alpha meters
• It can be mounted on any meter as external modem
• Power supply from the metrology (AC power)
• Power input surge protection from 4kV up to 12kV
• Supercapacitor option


• High availability
• Event monitoring
• Data encryption



  • Utility companies, service providers
  • Electricity metering (remote readout)
  • Meter data transmission to the centre
  • Remote operation/tarif mode switch
  • Connecting meters to the Smart Grid
  • Remote access, maintenance


The modem unit fits into the meter enclosure. It can also be attached/mounted to C-rail (by optional adapter).



The modem is supports the NB-IoT (Narrow-Band) Cat.M1 and Cat.NB1 LTE-M mobile network standards, static IP addresses. Transparent data transmission, supporting TCP/IP.



RS232, RS485 data connection (2- or 4-wire) can  be ordered by request.


Software features

  • Auto network recovery
  • Remote data download (such as metering values, parameters, load profile, log)
  • Remote configuration and firmware updates
  • Alarm notification and reports
  • Realtime clock (optional)



  • WM-E1S NB®
  • RS232/RS485 connection cable
  • Narrow-band, gained SMA antenna (optional)
  • Optional DIN-rail
  • WM-E Term® configuration software


Technical data

wm-e1s nb

Pay attention to the following products

WM-E Term configuration tool

WM-E Term configuration tool for the Elster, Honeywell, Itrón compatible metering modems



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