External, universal, transparent modem for meter connection. Available for LTE Cat.1 / Cat.M / 2G networks with 450MHz support.
A compact and cost-effective modem for connecting meters, sensors into the AMI and Smart Grid infrastructure.
Our cellular modem has been designed specifically for the automatic readout of meters. It can be installed as a universal external modem and can be connected to any meter type.
| Device type | Universal cellular modem |
|---|---|
| Primary use case | Smart metering (AMI/AMR), Smart Grid, Industrial Automation, Building Automation, Data Acquiring, LTE and Cat.M upgrade of legacy meters |
| Cellular & RF Access Technology | LTE Cat.1 / Cat.M/NB / 450 MHz; 2G fallback |
| Protocols | IEC Transparent, TCP, Modbus TCP/RTU, M-Bus |
| Interfaces, Physical Connectors | RS232, RS485, DI (digital inputs), Current Loop (CL0), M-Bus |
| Meter compatibility | RS232 output systems, Modbus meters and sensors, M-Bus meters and sensors, systems with current loop interface |
| Power & Environment | external AC or DC power — between -25 Celsius and +70 Celsius degree, IP52 protection |
| Approvals & Certifications | CE, RoHS, ReD DA |
| Firmware | Customized Free RToS (embedded system) |
| Configuration | WM-E Term configuration software (downloadable) via local or TCP |
| Device Management | Device Manager software (Remote provisioning, firmware update, bulk config) |
| Security | TLS, Tamper protection, Super capacitor (LastGASP notification), Surge protection, Sealable enclosure |
With this device you can connect any kinds of meters, industrial measurement systems, sensors with a central server by creating a transparent data link between them and the HES. The device can be ordered with various cellular module types.
Read consumption data from utility meters, sensors with a single modem! You can save money by using our modem, because there is no need further for manual readout of the meter systems, measurement environments.
The modem is equipped with several interfaces to connect multiple industrial equipment through the RS232 / RS485 port, CL (current loop), DI (2 digital inputs), a secondary RS485 interface and optional standard M-Bus port (request of ports by order).
Our device is suitable for remote readout of registers, consumption data of connected meters.
The modem is configurable by our WM-E Term® software.
Datasheet – WM-E8S Modem with RS232/RS485 port / CL (Current Loop) interface / DI (2 digital inputs)
Updated: 2025-06-05
Datasheet – WM-E8S Modem with RS232/RS485 port / Alternative RS485 port / CL (Current Loop) interface / DI (2 digital inputs)
Updated: 2025-06-05
Datasheet – WM-E8S Modem with RS232/RS485 port / MBus port (for max. 4 slaves) / CL (Current Loop) interface / DI (2 digital inputs)
Updated: 2025-06-05
WM-E8S User Manual
Updated: 2025-12-03
WM-E8S Quick Reference Guide
Updated: 2025-10-02
WM-E Term User Manual
Updated: 2025-12-04
Parameter Description
Updated: 2025-09-30
WM-E Term Appendix
Updated: 2025-01-22
WM-E Term configuration tool
Updated: 2025-12-04
Factory configuration sample file for WM-E Term (compressed CFG file)
Updated: 2022-12-05
Video tutorial – Chapter 1. WM-E Term: Introduction
Video tutorial – Chapter 2. WM-E Term: How to Create a log file from the connected modem?
Video tutorial – Chapter 3. WM-E Term: Serial port connection settings
Video tutorial – Chapter 4. WM-E Term: Debug redirection
Video tutorial – Chapter 5. WM-E Term: How to change the Display Language?
Video tutorial – Chapter 6. WM-E Term: Use Log Files in WM-E Term (Tutorial video)
4G LTE antenna with magnetic mount, SMA connection, 2.5m long RG174 cable, 6dBi max. gain
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