Pairing Field Devices

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.

Complete these steps before attempting to pair field devices.

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.

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

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.

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.

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.

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