iQntrol DOS-MODBUS dosing system

Use cases

• Monitor live pH, Redox, and temperature readings on a cloud dashboard for remote pool maintenance.
• Create alerts when pH or Redox values drift outside configured alarm limits to respond before water quality degrades.
• Adjust pH and mV setpoints remotely from the ModbusCloud platform without a site visit.
• Track chemical canister levels over time and schedule refills based on consumption trends.
• Set up notifications for flow loss, leak detection, or fuse faults to catch equipment issues early.
• Log historical water quality data for compliance documentation or seasonal analysis.

Installation

1. 1Connect the ModbusCloud gateway (MCG or MLP series) to the same local network as the iQntrol DOS-MODBUS, ensuring both devices can reach each other over Modbus TCP on port 502.
2. 2Verify the IP address of the iQntrol DOS-MODBUS unit and confirm it is reachable from the gateway using a network scan or ping test.
3. 3Set the Modbus TCP unit ID on the dosing system if multiple Modbus devices share the same network segment, and note the configured ID for the template setup.
4. 4Import the Peraqua iQntrol DOS-MODBUS template in the ModbusCloud portal and assign the correct IP address and unit ID to the device.
5. 5Confirm that live values for pH, Redox, and temperature appear on the dashboard, and verify alarm flag registers toggle correctly by simulating a flow interruption if possible.

Things to watch for

01

Why do some register values appear incorrect or swapped?

The device uses float32 registers for measurements and setpoints, and uint16 for status flags. Some register addresses overlap between function blocks. Ensure you are using the correct template mapping and that your gateway is reading the right function block for each register.

02

What byte order should I use for float32 registers?

Peraqua devices typically use big-endian (AB CD) byte order for float32 values. If readings look unrealistic, try toggling the word order setting in the ModbusCloud device configuration.

03

The gateway cannot connect to the dosing system over Modbus TCP. What should I check?

Confirm the iQntrol DOS-MODBUS and the gateway are on the same subnet. Verify that TCP port 502 is not blocked by a firewall or router. Check that no other client is holding an exclusive Modbus TCP connection to the device.

04

Is the Aquastar Air supported by this same template?

Yes. The Aquastar Air is listed as a compatible model and shares the same Modbus register map as the iQntrol DOS-MODBUS.

Registers (43)

43 read / 12 write

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