Chint DSSU666 Energy Meter 3-phase
Monitors 3-phase electrical parameters including voltage, current, power, and energy consumption.
This ModbusCloud template reads three-phase electrical measurements from a Chint DSSU666 energy meter over Modbus RTU at 9600 baud with odd parity. It covers line-to-line and line-to-neutral voltage, per-phase current, active and reactive power per phase and combined, power factor, frequency, and import and export active energy totals. The template also works for DTSU666, DSSU666-H, and DTSU666-H variants.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 28, read only
- Brand
- Chint
- Key readings
- Voltage L-L and L-N per phase · Current L1 to L3 · Active Power per phase and combined · Reactive Power per phase and combined · Power Factor per phase and combined · Import/Export Total Active Energy
- Compatible models
- DSSU666 · DTSU666 · DSSU666-H · DTSU666-H
- Last updated
Registers (28)
28 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Voltage L1-L2 | V | Read | |||
| Voltage L2-L3 | V | Read | |||
| Voltage L3-L1 | V | Read | |||
| Frequency | Hz | Read | |||
| Current L1 | A | Read | |||
| Current L2 | A | Read | |||
| Current L3 | A | Read | |||
| Voltage N-L1 | V | Read | |||
| Voltage N-L2 | V | Read | |||
| Voltage N-L3 | V | Read | |||
| Active Power Combined | W | Read | |||
| Active Power L1 | W | Read | |||
| Active Power L2 | W | Read | |||
| Active Power L3 | W | Read | |||
| Reactive Power Combined | var | Read | |||
| Reactive Power L1 | var | Read | |||
| Reactive Power L2 | var | Read | |||
| Reactive Power L3 | var | Read | |||
| Power Factor Combined | Read | ||||
| Power Factor L1 | Read | ||||
| Power Factor L2 | Read | ||||
| Power Factor L3 | Read | ||||
| Import Total Active Energy | kWh | Read | |||
| Export Total Active Energy | kWh | Read | |||
| Total reactive energy of the first quadrant | kvarh | Read | |||
| Total reactive energy of the second quadrant | kvarh | Read | |||
| Total reactive energy of the third quadrant | kvarh | Read | |||
| Total reactive energy of the fourth quadrant | kvarh | Read |
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Use cases
- Measure total grid import and export separately for net billing under varying feed-in tariff rules.
- Monitor per-phase current to spot phase imbalance before it triggers utility penalties.
- Log reactive power for sites where the utility charges for poor power factor.
- Track per-phase active power to correctly size a future EV charger or battery expansion.
- Compare reported energy against the customer utility bill to catch metering or billing errors early.
Installation
Wire the DSSU666 A and B terminals to the RS485 channel of your ModbusCloud gateway, twisted pair, with common ground.
Verify the meter front panel shows address 4, 9600 baud, odd parity, 1 stop bit. Adjust if you have multiple meters on one bus.
In ModbusCloud, add a Modbus RTU device matching those settings and import the Chint DSSU666 template.
If first voltage reading is 0 or a huge number, toggle the byte order in device settings and poll again.
Cross-check current and voltage against the meter display to confirm decoding is correct.
Things to watch for
Voltages show values like 3.4e38 on first poll. Byte order?
Yes. Chint transmits float32 as CDAB for DTSU666 and often the same for DSSU666. Enable the byte order swap checkbox in the ModbusCloud device settings. Normal voltages will appear on the next poll.
Can I use this template for DSSU666-H or DTSU666-H variants?
Yes, the H variants share the register map. They are not officially tested by Chint as compatible with this template, but community feedback confirms readings match. Verify one meter in your install and then roll out.
Why do I see both active and reactive power registers?
Active power is what you pay for on a domestic bill. Reactive power shows how much the load is out of phase with the voltage. Poor power factor increases apparent power, which commercial utilities charge for separately, so both matter on bigger sites.
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