Relay WebLog120 Instructions for use

Hardware User Manual
WebLog120
M-Bus Datalogger / Webserver for 120 Meters
Bedienungsanleitung

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Content
1. Features....................................................................................................................................................3
2. Installation.................................................................................................................................................3
2.1 Illustration of principle.........................................................................................................................3
2.2 Mounting.............................................................................................................................................3
2.3 Connectors .........................................................................................................................................4
2.4 LED Indicators ....................................................................................................................................5
3. Description of functions.............................................................................................................................6
3.1 Interfaces............................................................................................................................................7
3.2 RS232C Interface ...............................................................................................................................7
3.3 RS485 Interface (optional)..................................................................................................................7
3.4 Repeater Interface..............................................................................................................................8
3.5 USB Interfaces ...................................................................................................................................8
3.6 Ethernet Interfaces .............................................................................................................................8
4. Operating Manual .....................................................................................................................................9
5. Technical Data ........................................................................................................................................10
5.1 General Data ....................................................................................................................................10
5.2 Interface Data ...................................................................................................................................11
5.3 Ordering information.........................................................................................................................11
© Relay GmbH 2022
www.relay.de

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1. Features
-M-Bus Datalogger for up to 120 devices (M-Bus unit loads)
-Integrated web server for operating the device via web browser
-2 x LAN-Ethernet 10/100BaseT
-Built-in universal power supply
-Transparent level conversion from RS232C to M-Bus
-Integrated M-Bus Repeater allows dual operation with a second M-Bus master
-Optional 2-wire RS485 interface
-Data export as XML, XLSX or CSV via email, FTP, USB or download
-Automatic, time-controlled export of meter readings per tenant / group
-Firmware update via web browser
2. Installation
2.1 Illustration of principle
2.2 Mounting
The WebLog120 housing is installed on a TS35 top-hat rail. The housing occupies 8 division units (8 DU) on
the rail and, due to its low overall height of 60 mm, not only fits in a switch cabinet, but also in a meter cabinet
under the cover.
The device requires an external mains voltage of 110 to 250VAC, which must be connected by an electrician.
Please protect the device with a suitable fuse. We also recommend installing a circuit breaker in the control
cabinet so that the mains voltage can be switched off for service purposes.

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2.3 Connectors
The figure below shows the connections in a plan view:
All terminals are pluggable, making wiring and replacing the WebLog120 easier in the event of a fault.
Attention: Please make sure to put the terminals back correctly in the intended place after removing them.
Incorrectly positioned terminals can lead to defects.
Upper terminals (from left to right):
Type
Signal
Description
USB-OTG
Micro-USB socket (lowest level)
M-BUS
- / +
M-Bus output, lines to the M-Bus meters, 3 pairs in parallel
M-BUS REPEATER
M-Bus Repeater input for network expansion / second M-Bus master
RS232
TX / RX / GND
RS232C Interface, TX = PC transmits, RX = PC receives, GND
POWER
⏚
Protective conductor PE for symmetry binding and to protect the M-Bus
L
Connection of the phase (L) of the mains voltage
N
Connection of the neutral conductor (N) of the mains voltage

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Lower terminals (from left to right):
Type
Signal
Description
LAN 1
10/100 MBit RJ45 Ethernet socket for a network connection
LAN 2
10/100 MBit RJ45 Ethernet socket for a network connection
MICRO-SD
Holder for an optional micro SD card (push-push mechanism)
USB 1
USB host port #1
USB 2
USB host port #1
TERM
ON / OFF
Slide switch for switching the 120Ωterminating resistor of the RS485 on
and off
RS485
B- / A+ / GND
RS485 interface, 2-wire, B = - / A = + / GND = ground reference
2.4 LED Indicators
A total of 7 LEDs in the front cover indicate the status of the M-Bus and the system. A lighted LED has the
following meaning:
POWER
The M-Bus output voltage is switched on
TRANSMITTING
The master sends data
RECEIVING
At least one meter responds with data
MAX CURRENT
The maximum number of meters has been exceeded (warning current)
SHORT CIRCUIT
M-Bus overcurrent / short circuit (2 Hz flashing)
M-BUS ACTIVE
The WebLog120 occupies the M-Bus exclusively (RS232C + Repeater off)
ERROR
New unread error message(s) in event log

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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.

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3.1 Interfaces
The transparent RS232C and Repeater interfaces are always connected directly to the internal M-Bus level
converter when the WebLog120 is not reading the M-Bus meters itself.
The LED labeled ACTIVE shows the activity status of the internal interface switch. While this LED is lighted,
the CPU is active on the M-Bus, i.e. the other interfaces are deactivated during this time and cannot access
the M-Bus. As soon as the LED goes out, an external controller (PC) can read the M-Bus via RS232C or
repeater.
3.2 RS232C Interface
The WebLog120 offers an RS232C interface that is transparent to the M-Bus and is connected via a 3-pin
screw terminal. The assignment is as follows: TX = PC receives from M Bus, RX = PC transmits to M Bus,
GND = signal ground. If you want to connect a D-SUB cable, please use the additional, optional cable KA006
with 3 open wires. To connect to a PC (1:1 connection), connect the 3 wires as follows:
D-SUB
Signal
Function WebLog120
Colour (terminal)
Pin 1
DCD (data carrier detect)
unused
Pin 2
RXD (PC receives data)
M-Bus sends data to PC
green (TX)
Pin 3
TXD (PC sends data)
PC sends data to M-Bus
yellow (RX)
Pin 4
DTR (data terminal ready)
unused
Pin 5
GND (signal ground)
GND
black (GND)
Pin 6
DSR (date set ready)
unused
Pin 7
RTS (request to send)
unused
Pin 8
CTS (clear to send)
unused
Pin 9
RI (ring indicator)
unused
3.3 RS485 Interface (optional)
The RS485 interface will be available in a future version of the WebLog120 as an interface to the internal CPU,
but not as a transparent interface to the M-Bus.
A 2-wire RS485 interface is connected to the terminals marked RS485 (A = + and B = -). With the help of the
slide switch labeled "TERM", you can activate a 120 Ωterminating resistor between terminals A+ and B- as
required.

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3.4 Repeater Interface
The WebLog120 can be used as a so-called repeater for network expansion for existing M-Bus systems if the
maximum number of meters or the maximum cable length for the installation has been exceeded. Up to 120
end devices and up to 4 km of cable (JYSTY 1 x 2 x 0.8) can be connected to the device at a transmission
speed of 2400 baud. The repeater input also enables a second M-Bus master to access the meters connected
to the WebLog120.
The M-Bus line of the existing master or level converter is connected to the terminals marked M-Bus Repeater.
As standardized for M-Bus slaves, the polarity is arbitrary. A processed signal for connecting an M-Bus net-
work is then available at the M-Bus output of the WebLog120. This M-Bus network can then be read out by
the WebLog120 and the other master one after the other, but not at the same time.
3.5 USB Interfaces
The WebLog120 provides two USB host interfaces as USB 2.0 type A sockets on the front of the housing.
These interfaces, labeled USB 1 and USB 2, are used, for example, for a USB memory stick as an export
medium or to load firmware updates. A USB WLAN stick can also be permanently inserted here to provide a
WLAN interface (Art. FG eWLAN). Another USB interface is available as a micro-USB socket (USB-OTG)..
3.6 Ethernet Interfaces
The WebLog120 has two 10/100Mbit network ports labelled LAN 1 and LAN 2. LAN 1 is used to permanently
connect the device to a local network or a separate router for DSL or mobile communications. LAN 2 is re-
served for future applications.

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4. Operating Manual
The operation and setup of the device via the Ethernet interface. For the initial setup, please establish a 1:1
connection between your PC and LAN 1 of the WebLog120 using a network cable.
For easy configuration, the WebLog120 offers a so-called link-local IP address, under which you can always
reach the device in the local network or directly in a 1:1 connection. Start your browser on your PC and enter
this IP address in the address bar of the browser:
https://weblog120-SN.local (SN = 5 digit serial number of the device)
Here an example for the device with the serial number 00015: https://weblog120-00015.local.
In the browser, enter the administrator password and click on Login and then click the "Login" button.
After successfully logging in, you will see the main menu of the web interface.
The operation of the device via the web interface is described in a separate manual, which is availa-
ble for download on our homepage.
The factory default password is as follows: 00001767
The WebLog120 shows the serial number (SN)
and a user definable name (ID) on the login
screen.

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5. Technical Data
5.1 General Data
Operating voltage
110 .. 250VAC, 47 .. 63 Hz
Power consumption
max. 60W
Operating temperature range
0 .. 45°C
M-Bus voltage (no load)
36 V (Mark), 24V (Space)
M-Bus basic current
max. 180 mA
Overcurrent threshold
> 250 mA
Internal bus resistance
8 Ohm
Communication speeds
300 .. 38400 Baud
Maximum cable length for rec-
ommended cable type
JYSTY 1 x 2 x 0,8 mm
Total (all wires): 1km (9600 baud), 4km (2400 baud), 10km (300 baud)
Max. distance to slave (120 slaves at the end of the cable):800 m
Max. distance to slave (120 slaves equally distributed): 1600 m
Galvanic isolation
All interface are isolated from M-Bus and power supply. The Repeater input is addi-
tionally isolated from the other interfaces.
Housing
Light-grey and black PC plastic, protective class IP30
H x B x T: 140 x 90 x 60 mm (height without terminals)
Mounting on a rail (8 HP)
LED indicators
power, communication Master, slave, warning current, overcurrent M-Bus,
M-Bus Activity, Error
Interfaces
2 x 10/100 Mbit Ethernet, 2 x USB-Host, RS232C, RS485, Repeater, Micro-SD
Optional: W-LAN, RS485
Terminals (all pluggable)
3 pair of terminals M-Bus, 3-pin terminal for RS232C, 3-pin terminals für RS485,
2-pin terminal for Repeater, 3-pin terminal for power supply / protective ground

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5.2 Interface Data
RS232C
Driver load
Current max. 5mA, resistive: min. 3kΩ, capacity: max. 2,5 nF
Voltage transmit (at 3kΩ)
Mark: +5V ≤ UT≤ +15V
Space: -15V ≤ UT≤ -5V
Voltage receive
Mark: +2,5V ≤ UR≤ +15V
Space: -15V ≤ UR≤ -2,5V
RS485
Driver load
Current max. 250 mA, resistance min. 54Ω
Signal voltage TX
Space (0): +1.5V Ut+5.0V
Mark (1): -5.0V Ut-1.5V
Addressing
Not possible (transparent)
Max. cable length
3,0 m
Repeater
Current M-Bus IN
Basic current < 1,5 mA (1 Unit Load), TX current typ. 15mA
Capacity
Max. 250 pF
Galvanic isolation
> 2,5 kV to all interfaces, M-Bus and power supply
USB
Type
USB 2.0 device, socket type B
USB IC
FTDI Chip: FT232R, Vendor ID = 0403, Product ID = 6001
Power supply
Bus powered, Low Power (max. 90mA)
Max. cable length
3,0 m
Ethernet
Network interface
10/100BaseT (RJ45), auto-MDIX, with 2 LEDs
5.3 Ordering information
Article number
Description
WEBLOG120
Web-based M-Bus Central for 120 meters
KA003
Power cable (German connector), length 2m
KA PATCH.5E RJ45 1M
Network patch cable CAT5E FTP, Length = 1m, grey
KA006
Serial D-SUB-9 female cable with 3 open wires
EWLAN
WiFi adaptor extern

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Notes