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IoT Gateway

Pairing Field Devices

How to add and configure water meters, level sensors, and other devices to the HPzenAi gateway.

How Device Pairing Works​

Once the gateway is online, it continuously scans the RS485 bus for connected field devices — water meters, level sensors, relay controllers, and motor starters. Discovered devices appear in the HPzenAi app where you can name them, set alert thresholds, and begin monitoring. RS485 devices are identified by their unique Modbus address (1–32). Each device must have a unique address on the bus before pairing.

Prerequisites​

Complete these steps before attempting to pair field devices.

Steps​

  • Gateway powered on and connected to the internet (Wi-Fi or SIM).
  • Gateway registered in the HPzenAi app and showing Online status.
  • Field devices physically installed and RS485 wired to the gateway terminal block.
  • 12V DC power applied to all field devices.
  • Each field device configured with a unique RS485 Modbus address (1–32).

The gateway automatically scans the RS485 bus when powered on and re-scans periodically. Newly connected devices with valid Modbus addresses are detected within 60 seconds and appear under Gateway → Discovered Devices in the app. Tap any discovered device to assign a name and complete the linking process.

Visual reference coming soon

Manual RS485 Scan​

If a device does not appear under Discovered Devices within 2 minutes, trigger a manual scan from the app.

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Open the HPzenAi app.

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Manual Device Addition​

Use manual addition when you know the device type and Modbus address but auto-discovery does not find it — for example, on long cable runs or when a non-standard baud rate is used.

Steps​

  • Go to Gateway → Add Device in the app.
  • Select the device type: water meter, level sensor, relay controller, or motor starter.
  • Enter the RS485 Modbus bus address assigned to the device (1–32).
  • Select the gateway the device is wired to.
  • Tap Verify — the app queries the device and confirms the connection.
  • Assign a descriptive name and tap Save to complete the linking.

Linking Devices via QR Code​

HPzenAi devices ship with a QR code on the label that encodes the device type and factory Modbus address. Scanning the QR code during pairing pre-fills the device type and address automatically, reducing manual entry errors.

Guided Help Center

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Open the HPzenAi app.

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Device Naming and Grouping​

Assign descriptive names to devices immediately after linking so they are easily identified on the dashboard. Use names that reflect physical location or function — for example, 'Overhead Tank Level', 'Borewell Sensor', or 'Block A Water Meter'. Group related devices by location or function using the Groups feature under Devices → Manage Groups to keep large installations organised.

Verifying a Paired Device​

After pairing, confirm the device is delivering live data before completing the installation.

Steps​

  • Open the device tile in the HPzenAi app and confirm the status shows 'Connected'.
  • Verify live readings are displayed and updating periodically.
  • For water meters, confirm the reading matches the current mechanical register value.
  • For level sensors, confirm the reported level is consistent with the known tank level.
  • Set alert thresholds under the device tile to enable notifications for high or low readings.