D+H ACB louvre window drive Modbus RTU based for natural ventilation

Use cases

• Monitor actual louvre window positions in real time on a cloud dashboard to verify ventilation schedules.
• Create an alert when a drive reports a fault state so you can respond before the window becomes inoperable.
• Log opening percentages and electrical parameters over time to analyse ventilation patterns and energy usage.
• Send target position commands remotely to adjust natural ventilation without on-site intervention.
• Track current and voltage readings per drive to detect mechanical obstructions or ageing components early.

Installation

1. 1Wire the Modbus RTU cable (A, B, GND) from the ModbusCloud gateway (MCG or MLP series) to the D+H ACB Modbus extension, observing correct polarity.
2. 2Set each D+H ACB drive or synchronous group to a unique Modbus slave address using the drive configuration tool or DIP switches as described in the D+H documentation.
3. 3Configure the gateway serial port to 19200 baud, odd parity, and 1 stop bit to match the D+H ACB default communication settings.
4. 4Import the D+H ACB louvre window drive template from the ModbusCloud template library and assign the correct slave addresses to each drive or group.
5. 5Verify communication by checking that actual position and condition code values appear on the ModbusCloud dashboard for each configured drive.
6. 6Optionally add a 120 ohm termination resistor at the last device on the Modbus RTU bus if the cable run exceeds a few metres.

Things to watch for

01

The gateway cannot communicate with the D+H ACB drives. What should I check first?

Verify that the baud rate is set to 19200 with odd parity on both the gateway and the drives. Also confirm correct A/B wiring polarity and that each drive has a unique slave address.

02

Can I control multiple synchronous window groups over one Modbus cable?

Yes. Each synchronous group can have its own Modbus slave address. Up to 32 drives can share one Modbus RTU bus, and the template supports addressing each group individually.

03

Position values seem stuck or do not update. What could cause this?

Check that the drive has completed its calibration run so it knows its end positions. Also verify the polling interval on the gateway is not too aggressive, which can cause bus collisions with many devices.

04

Do I need a termination resistor on the Modbus RTU bus?

A 120 ohm termination resistor at each end of the bus is recommended for cable runs longer than a few metres. Without termination, signal reflections may cause intermittent communication errors.

Registers (10)

7 read / 3 write

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