WebLog 250

M-Bus Datalogger for 250 devices with touchscreen and webserver

  • Web enabled M-Bus Logger for 250 meters

  • USB, Ethernet and RS232C interface standard

  • optional WiFi

  • Readout by webbrowser

  • Exports data as XML, XLSX or CSV via E-Mail, FTP or USB

  • 1 GB internal memory

  • integrated 110 .. 250 VAC power supply

WebLog 250 - A new era

Replacing the Digital Master series the WebLog starts a new era of M-bus data loggers. It combines the familiar and well-proven M-Bus qualities of the DR series with the advantages of actual interfaces, a significant increased memory, an integrated database and the convenient using possibilities offered by an embedded Web server.

This combination enables you to create meter groups or even filter meters already in the data logger, for example to assign different log intervals to different meters. While reading the meters, the complete data of the 1st telegram is stored in the 1GB (Login / export) flash memory. When exporting the data it is possible to select only relevant data for the special reading purpose. Once administrated, the WebLog can run the user-defined exports fully automatically, and send the data in CSV, XLSX, or XML format via email or upload to an FTP server. The new standard of comfort is completed by the integrated flexible power supply (110 .. 250VAC) and a housing, that is mountable on wall and on the DIN-rail.

Remote access to the WebLog250 is done via a web browser. Up to 250 terminals can be managed.

Technical Data

Operating Voltage

110 .. 250VAC / 47 .. 63 Hz

Power Consumption

max. 100W

Temperature Range

0 .. 55 °C

M-Bus Voltage (without load)


Bus Impedance

ca. 8 Ω

M-Bus Standby Current

max. 375mA

Overcurrent Threshold


M-Bus Baud Rate

300 .. 9600 Baud

Galvanic Isolation



Light grey ABS plastic, protection class IP52, H x W x D: 264mm x 234mm x 86mm

LED Status Indicators

power, communication, maximum load M-Bus, M-Bus short circuit


7" LCD display with resestive touch screen, 800 x 480 pixels 262144 colors


1 GB Flash memory


10/100 MBit Ethernet, USB-Host, USB-Device, RS232C optional: W-LAN, analogue modem or GPRS modem


3 x terminals for M-Bus, plug-in terminals for floating contacts and relay outputs


Firmware WebGUI Version 2 (HTML5)

WebLog250 Firmware V3.1.12

Attention: Check and set "M-Bus Command Retries" to 2 in M-Bus Settings after update. 

Order Information

Order Number



M-Bus Datalogger with webserver for 250 slaves


Mounting accessory for DIN rail


Safety lock for WebLog housing


WiFi adaptor with ext. antenna integrated in WebLog250

Copyright© 2018  Relay GmbH

Designed By T.McDowell