Chint DDSU666 Energy Meter 1-phase

Installation

1. 1Wire the RS485 A and B terminals of the Chint DDSU666 to the corresponding RS485 terminals on your ModbusCloud gateway (MCG or MLP series), observing correct polarity.
2. 2Set the Modbus slave address on the DDSU666 using the meter's front panel buttons, and ensure it does not conflict with other devices on the same bus.
3. 3Confirm the meter's communication settings are 9600 baud, odd parity (default), matching the template configuration.
4. 4Log in to the ModbusCloud platform, navigate to the template library, and import the Chint DDSU666 template to your project.
5. 5Assign the configured slave address in the ModbusCloud template and verify that live readings for voltage, current, and power appear on the dashboard.
6. 6If using a long RS485 cable run or multiple devices on the bus, add a 120 ohm termination resistor at the last device on the bus.

Things to watch for

01

I see zero or incorrect values for voltage and power. What could be wrong?

The DDSU666 uses float32 (IEEE 754) encoding across two consecutive registers. Verify that the byte order and word order settings in your gateway match the meter's format. The template is preconfigured for this, but manual overrides may cause misreads.

02

The gateway cannot communicate with the meter at all. What should I check?

Confirm that the RS485 A and B wires are not swapped. Also verify the baud rate is set to 9600 and parity is set to odd (1 stop bit) on both the meter and the gateway. Check that the slave address on the meter matches the address configured in the template.

03

Can I connect multiple DDSU666 meters to one ModbusCloud gateway?

Yes. Assign a unique Modbus slave address to each meter and daisy-chain them on the RS485 bus. Import a separate template instance for each meter and set the corresponding slave address in ModbusCloud.

04

Does the energy reading reset when the meter loses power?

No. The DDSU666 stores the accumulated energy total in non-volatile memory. The kWh value persists through power cycles and continues counting when power is restored.

Registers (8)

8 read / 0 write

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