WebLog120 · Hardware User Manual Version 1.0 - 12/2022
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WebLog120
3. Description of functions
The WebLog120 is an M-Bus data logger and web server. Up to 120 meters (= standard loads á 1.5mA) can
be connected directly to the internal M-Bus level converter. The device can manage and read a total of up to
1000 devices if appropriate M-Bus Repeaters (PW100 / PW250) are used as an extension.
The integrated web server enables complete setup and operation via the network interface (LAN) or the op-
tional WLAN module with a web browser. No additional software is required. Access to the Internet can be
implemented via LAN or WLAN with the help of an additional DSL or cellular router. Access to the WebLog120
via the Internet usually requires port forward or a VPN connection.
The WebLog120 manages all M-Bus meters of the system. For this purpose, an automatic meter search is
started and, if necessary, individual texts and log intervals are assigned to each meter or meter group. The
logged data is permanently stored in an SQLite database in the internal FLASH memory. In principle, all data
from the first M-Bus protocol of the meter is stored in the database. This data can be conveniently exported
manually or automatically by e-mail, (S)FTP, by download in the browser or on a USB stick. The user decides
which data he needs for the respective export.
The device offers structured user management with various access rights, from administrators to tenants, who
can only read their own meters.
The WebLog120 also has an RS232C interface that allows transparent access to the internal level converter.
There, externally connected controllers such as a GLT, a DDC or a PC can read the connected meters with
M-Bus software (not included in the scope of delivery). The device also offers a transparent repeater input for
dual operation with a second M-Bus master / level converter.
