WM-E2SL Modem - Quick Reference Guide

for Landis+Gyr® E350, E450, E550 electricity meters (Zxx3xx, Zxx4xx type)

Connection Points

The WM-E2SL modem is a compact communication device. Key connection points and components are labeled as follows:

1: Plastic enclosure and its top cover
2: PCB (mainboard)
3: Fastener points (fixation lags)
4: FME antenna connector (50 Ohm) - optionally: SMA antenna connector
5: RJ45 connector (data connection and DC power supply)
6: Data connection cable interface
7: Status LEDs: from left-to-right: LED2 (red), LED1 (blue), LED3 (green)
8: Mini SIM-card holder (pull it to the left and open up)
9: PCB fastener screws
10: Super-capacitors
11: Internal antenna connector (U.FL - FME)

[Diagram Description: A diagram shows the WM-E2SL modem unit with numbered connection points. The modem is a grey rectangular box. Labels point to the enclosure, PCB, antenna connectors, RJ45 port, SIM holder, and other internal components.]

Power Supply and Environmental Conditions

Power supply: 8-12V DC (10V DC nominal)
Current: 200mA, Consumption: 2W @ 10VDC
Power input: Can be supplied from DC power by the meter through the RJ45 port.
Wireless communication: According to the selected module (order options).
Ports: RJ45 connection: RS232 (300/1200/2400/4800/9600 baud).
Operation temperature: -30°C* to +60°C, 0-95% rel. humidity (*TLS: from -25°C).
Storage temperature: -30°C to +85°C, 0-95% rel. humidity.

Mechanical Data / Design

Dimensions: 86 x 85 x 30mm
Weight: 106 gr
Outfit: The modem has a non-conductive, IP21 protected plastic housing. The enclosure can be fastened by the fixing ears under the meter’s terminal cover.

Installation Steps

Remove the meter terminal cover by its screws.
Ensure the modem is NOT under power supply and remove the RJ45 connection from the meter.
Push the ears (3) and open the enclosure’s top cover (1) at the antenna connector.
Push the plastic SIM holder’s cover (8) from right to left and open it.
Insert an active SIM card into the holder (8), ensuring the chip faces down and the cutted edge faces outwards towards the antenna. Push the SIM into the guiding rail, close the SIM holder, and slide it back from left to right.
Ensure the antenna’s internal black cable is connected to the U.FL connector (11).
Check that the internal data cable (5) is connected to the PCB (2) at the data connector interface (6).
Mount an antenna to the FME antenna connector (5). Use an SMA-FME converter if using an SMA antenna.
Connect the modem to the computer using an RJ45 cable and an RJ45-USB converter. Set the jumper position to RS232 mode for configuration.
Configure the modem using the WM-E Term® software.
After configuration, remove the RJ45-USB adapter. The modem’s power supply will cease.
Close the modem enclosure cover (1) by its fastener ears (3) until a click sound is heard.
Install the modem onto the meter’s fastener/fixation points and secure it.
Connect the modem to the Landis+Gyr® meter via the RS232 port using a 1:1 cable connection (beige RJ45 cable).
The modem will be powered by the meter and start operation. Device activity can be checked via the LEDs.

Operation LED Signals

Attention: The modem must be charged before first use or if it has been unpowered for a long time. Charging takes approximately 2 minutes if the supercapacitor is discharged. Factory defaults for LED signals can be changed via the WM-E Term® configuration tool.

LED	Status / Legend	Events / Meaning
LED3 (Green)	SIM status / SIM or PIN failure	Continuously lit: Device is not on the cellular network and RSSI cannot be detected (SIM okay). Active: SIM PIN is okay. Slow flashing (once per second): No SIM detected or SIM PIN is wrong. RSSI Signal Strength Indication: Flashes 'N' times every 10-15 seconds. The number of flashes indicates RSSI value (1-4). Specific flash counts vary by network technology (2G, 3G, 4G LTE, LTE Cat.M1, LTE Cat. NB-IoT). For example, on 2G: 1 flash (RSSI ≥ -98), 2 flashes (-97 to -91), 3 flashes (-90 to -65), 4 flashes (> -64). Similar ranges are provided for other technologies.
LED1 (Blue)	GSM / GPRS status	Active: During network registration. Blinking once per second: During network searching. Blinking twice per second: Connected to the network with IP connection okay. Quick flashing: Mobile network access technology change (2G: 2 flashes/sec, 3G: 3 flashes/sec, 4G: 4 flashes/sec). Blank: No available cellular network detected. Continuously lit: During CSD call and IP data forwarding.
LED2 (Red)	E-meter status	Inactive: General status. Active (flashing): During communication.

[Note: During firmware uploading, LEDs may behave differently. After installation, all 3 LEDs light for 5 seconds, then blank before restarting with new firmware.]

Modem Configuration

The modem requires configuration using the WM-E Term® software before normal operation. This process involves connecting the modem to a PC.

[Diagram Description: A screenshot of the WM-E Term software interface is shown, illustrating the configuration window for setting up serial connections, device information, and parameters.]

Modem Configuration by WM-E Term®

Requirements: Microsoft .NET Framework runtime, APN/data package enabled, active SIM card. Configuration is possible without a SIM, but some features may be limited.

Connection to the modem (via RS232 port)

Download and extract: https://www.m2mserver.com/m2m-downloads/WM-ETerm_v1_3_63.zip. Run wm-term.exe.
Click "Login" and select the WM-E2S device.
In the "Connection type" tab, choose "Serial". Enter a "New connection" profile name and click "Create".
Select the correct COM port and set the Data transmission speed to 9600 baud. Data format should be 8,N,1. Click "Save".
Choose "serial" as the connection type at the bottom left.
Click the "Device information" icon to check RSSI (signal strength). Aim for at least yellow (average) or green (good signal quality). Adjust antenna position if needed.
Click the "Parameter readout" icon to connect and read modem parameters.

*For data call (CSD) or TCP/IP connection, refer to the Installation Manual.

Parameter Configuration

Download a sample configuration file: https://m2mserver.com/m2m-downloads/WM-E2SL-STD-DEFAULT-CONFIG.zip. Use File / Load to open it.
In the "Parameter" group, select "APN". Click "Edit values", define the APN server, and optionally APN Username and Password. Click "OK".
In the "M2M" parameter group, click "Edit values". Set the PORT number for the Transparent (IEC) meter readout and for Configuration/firmware download. Click "OK".
If the SIM has a PIN, enter it in the "Mobile network" parameter group under "SIM PIN". Select a "Mobile network technology" (e.g., "All available" is recommended) or "LTE to 2G" for fallback. You can also select the mobile operator/network automatically or manually. Click "OK".
RS232 serial port and transparent settings are in the "Trans. / NTA" parameter group. Default settings for multi-utility mode: transparent mode, Meter port baud rate: 9600, Data format: Fixed 8N1. Click "OK".
In the "RS485 meter interface" parameter group, disable RS485 mode. Click "OK".
Click the "Parameter write" icon to send settings to the modem. Monitor the progress bar. The modem will restart with new settings.
To use the modem via RS485, modify the jumpers to RS485 mode.

Further Setting Options

Modem handling can be refined in the "Watchdog" parameter group.
Save configured parameters using File/Save.
For firmware upgrade, select Devices menu > Single Firmware upload. Upload the .DWL file. The modem will reboot with the new firmware and previous settings.

Support

The product carries the CE mark, complying with European regulations.

Product documentation and software are available on the product's website: https://www.m2mserver.com/en/product/wm-e2sl/

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