WM-E1S Modem for SAPHIR Meters

Cellular modem specifically designed for SAPHIR electricity meters
Electricity meter
Smart Metering
4G / 2G fallback
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 from GSM to UMTS 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 SAPHIR electricity meters. This device was designed to be fully compliant with all SAPHIR 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.

This external modem can be mounted on a DIN-rail and connected to the meter through an RJ45 cable. It can be configured to “push” the data it reads from the meter to the HES periodically at pre-programmed intervals or triggered by an alarm/event (for example, power outage, cover removal, reverse run etc.).

The modem reads actual and stored consumption data, recorded event log, load profile data, and can be used to read or modify certain parameters of the meter remotely. The device can be powered from the meter’s mains connection of the 57/100V AC power network (phase voltage) or 230/400V AC power network (line voltage).

It can be accessed remotely through the cellular network and it can send data on the Internet by using an APN.

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


Main features

  • Supporting the 4G networks – with 2G „fallback” feature
  • External modem, compact design (sealed and separated from meter)
  • It can be fastened securely by its DIN-rail adapter
  • Compatibility with the SAPHIR® electricity meters
  • AC power supply from the metrology
  • Transparent meter connection (RJ45)
  • „Push” data sending
  • Optional TLS encryption
  • Immediate alarm- and SMS notification
  • Remote & safe firmware updates
  • Downloadable WM-E Term® configuration tool



  • Utility companies
  • Meter data transmission to HES
  • Smart metering
  • Industrial measurement

Design and outfit

  • External modem, compact design (separated from meter)
  • RS232 interface (RJ45), transparent communication
  • AC power pigtail connector: 100-240V AC power supply by meter (57.7/100V AC phase voltage or 230/400V AC line voltage can be connected)



  • SAPHIR® electricity meters



  • IEC 62056-21 protocol, transparent data transmission
  • „Push“ data sending
  • Optional TLS encryption
  • Immediate notification, SMS messages



  • RJ45 cable (1m long – for meter connection/configuration)
  • DIN-rail adapter (by anodized aluminum with spring steel wire) for mounting to 35mm wide DIN rail
  • WM-E Term® configuration software


Technical data


Product Datasheet
 User Manual
WM-E Term User Manual

WM-E Term configuration tool

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