WM-E3S Modem for Elster AS smart meter family

Cellular modem specifically designed for Honeywell AS220/AS230/AS300 and AS1440, AS3000/AS3500 electricity meters. Available for LTE Cat.1 / 2G / 3G, LTE Cat.4, Cat.M / Cat.NB networks.
Electricity meter
Smart Metering
Wireless access
FW Updates
Remote Access


All around the world mobile operators are shutting down 2G/3G networks in order to give way to 5G. Companies that operate smart meters with 2G/3G connectivity must plan the migration to the latest 4G LTE network which is well-positioned to dominate smart metering communication technologies in the upcoming years. The migration to LTE has many advantages, for example, a shorter readout time due to the high-speed network with low latency.

Utilities have two options for migration: replace the meters or upgrade the modems within their routers! The 1st option comes with a high CAPEX, while the 2nd option is a future-proof solution that reduces TCO.

Our company develops cellular modems that work smoothly and are fully compatible with the different models of Honeywell electricity meters. These devices were designed to fit under the terminal cover of the meter and are compliant with all Honeywell standards. Our cellular modems represent a future-proof migration solution to the LTE network with the same functionality, on higher data speed. Configuration and firmware updates can be done remotely, minimizing the need for costly site visits.

The product’s case was designed to fit under the terminal cover of the meter. As part of an AMR/AMI solution, the modem provides a stable, transparent “push” or “pull” connection to the HES. The modem reads actual and stored consumption data, recorded event log, and load profile data by “push” or “pull” data transfer method.

The device is fully configurable by our WM-E Term® software.


Main features

  • Wireless module order options:
    • 4G LTE Cat.1 with 2G or 2G / 3G “fallback” feature
    • 4G LTE Cat.4 / 3G / 2G
    • LTE Cat.M / Cat.NB with optional 2G “fallback” feature
  • It can be assembled into the meter’s enclosure and fastened securely (sealed and separated from meter)
  • Design & connectivity meets with meter standards
  • Power supply (AC) from the meter
  • Compatible with Honeywell® AS220/AS230/ AS300, the AS1400 and the AS3000/AS3500 meters
  • Expansion module options
  • Surge protection option (from 4kV up to 12kV)
  • Embedded, realtime operation system
  • „Pull” data sending (for HES request), alarm triggered
  • „Push” data sending (FTP or IEC push, SMS trigger)
  • IEC 62056-21 protocol
  • Data encryption
  • Scheduled data sending or triggered by an alarm
  • Remote & safe firmware update and configuration
  • Supercapacitor option (for power outage and notification)
  • WM-E Term® application (mass configuration, FW refresh)
  • Device Manager® software (order options)



  • Utility companies
  • Meter data transmission to the HES centre
  • Smart Metering
  • Industrial measurement

Design and outfit

  • The modem PCB can be installed inside the meter enclosure – by modem enclosure rails
  • AC power from the meter
  • Compatibility with Honeywell® AS220/AS230/AS300, the AS1440 and the AS3000/AS3500 electricity meters


Expansion options

  • Relay board (switch operation/tariff)
  • Customer Interface outfit (RJ12, 6P6C)
  • MBUS interface (terminal block, transparent and non-transparent)
  • Ethernet interface (RJ45, operation and data transmission without a cellular module)
  • Supercapacitors (against power outages)



  • „Pull” data sending (for HES request), or alarm triggered
  • „Push“ data sending (Ftp or IEC data “push”, SMS triggering)
  • IEC 62056-21 protocol Mode C
  • Data encryption
  • Scheduled data sending trigger by an alarm
  • Immediate alarm notification (power outage, status)



  • Optional SMA antenna (50 Ohm) – upon request
  • WM-E Term® configuration software


Technical data

WM-E3S Modem for AS meters – LTE Cat.1 module with 2G or 2G/3G “fallback”, LTE Cat.M/Cat.NB module with optional 2G “fallback”



WM-E3S Modem for AS220/AS230/AS300 meters – LTE Cat.4 / 3G / 2G modules



WM-E3S Modem for AS1440 and AS3000/AS3500 meters – LTE Cat.4 / 3G / 2G module


Datasheet – WM-E3S Modem for AS meters – LTE Cat.1 module with 2G or 2G/3G “fallback”, LTE Cat.M/Cat.NB module with optional 2G “fallback”

Datasheet – WM-E3S Modem for AS220/AS230/AS300 meters – LTE Cat.4 / 3G / 2G modules

Datasheet – WM-E3S Modem for AS1440 and AS3000/AS3500 meters – LTE Cat.4 / 3G / 2G module

Installation Manual (WM-E3S)

Installation Manual (WM-E3S CI/CIR – Customer Interface/Relay board version)

Quick Guide

WM-E Term User Manual

WM-E3S Parameter Description

WM-E Term Appendix

WM-E Term configuration tool

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The remote management and maintenance of an IIoT solution can be a real challenge. Improve the network availability and operational efficiency of your fleet!

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