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BMeters IWM-TX3

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Description​

The IWM-TX3 is a WMBUS radio module for the transmission of consumption data, applicable to the series of multi jet water meters mod. GMDM-I, GMB-I, GMB-RP-I and single jet mod. CPR-M3-I.

Configuration​

Configuration Guide for IWM-TX3 Water Meter via NFC​

This guide describes the steps to configure a water meter with an IWM-TX3 NFC module using an Android smartphone.

Step 1: Install the Configuration App​

Download the B METERS NFC Config application from the Google Play Store:

https://play.google.com/store/apps/details?id=it.gread.bmeters_appnfc&hl=en

You can scan the QR code below to go directly to the app:

QR Code - B Meters NFC Config

Step 2: Connect to the Meter​

  1. Enable NFC on your Android device.
  2. Open the B METERS NFC Config app.
  3. Hold your smartphone close to the NFC tag on the water meter until the connection is established.

Step 3: Select Device Type​

From the list of available devices, select:

  • IWM-TX3

Step 4: Configure Sensor Parameters​

Adjust the following settings:

  • AMR: Check (enable automatic meter reading)
  • Water meter type: GMDM-I AF
  • Transmit during weekend: Check (enable weekend transmissions)
  • Global encryption: Check (Use of a global key instead of an individual one)

Step 5: Write Configuration to Meter​

  1. Bring your phone close to the NFC tag again.
  2. Tap the Write button.
  3. Wait for the message: Writing Done.

Step 6: Verify Settings​

  1. Tap the Read button.
  2. Check that the configured values match what was written.

Your water meter is now successfully configured.

Read data via config

Wireless M-Bus Address Configuration​

Where to Find the Address on the Device​

The address is located in the center above the barcode, following the letters SN (serial number), as shown in the image below (8 digits).


Mapping the wM-Bus Address to Chester​

The mapping must be carried out using the Chester terminal, for example with:

Managing and Adding wM-Bus Device Addresses in Chester​

Here you can manage the list of wM-Bus addresses (add/remove), adjust scan settings, and review example configurations for typical setups.

Message Encryption and Key Management​

The transmitted messages are encrypted to optimize energy consumption during data transmission, which extends the overall battery life.

The received data must therefore be decrypted, which is done using decryption keys.
To achieve this, there are two options: