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.

Free Modbus template: Chint DSSU666 Energy Meter 3-phase

Name: Chint DSSU666 Energy Meter 3-phase
Brand: Chint
SKU: 62cafa69-74a9-445a-93fe-a7406d0fb87e

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Free Modbus template: Chint DSSU666 Energy Meter 3-phase | ModbusCloud

Registers (28)

28 read / 0 write

Name	Address	Function	Type	Unit	Access
Voltage L1-L2	8192	FC04	float32	V	R
Voltage L2-L3	8194	FC04	float32	V	R
Voltage L3-L1	8196	FC04	float32	V	R
Frequency	8260	FC04	float32	Hz	R
Current L1	8204	FC04	float32	A	R
Current L2	8206	FC04	float32	A	R
Current L3	8208	FC04	float32	A	R
Voltage N-L1	8198	FC04	float32	V	R
Voltage N-L2	8200	FC04	float32	V	R
Voltage N-L3	8202	FC04	float32	V	R
Active Power Combined	8210	FC04	float32	W	R
Active Power L1	8212	FC04	float32	W	R
Active Power L2	8214	FC04	float32	W	R
Active Power L3	8216	FC04	float32	W	R
Reactive Power Combined	8218	FC04	float32	var	R
Reactive Power L1	8220	FC04	float32	var	R
Reactive Power L2	8222	FC04	float32	var	R
Reactive Power L3	8224	FC04	float32	var	R
Power Factor Combined	8234	FC04	float32		R
Power Factor L1	8236	FC04	float32		R
Power Factor L2	8238	FC04	float32		R
Power Factor L3	8240	FC04	float32		R
Import Total Active Energy	4126	FC04	float32	kWh	R
Export Total Active Energy	4136	FC04	float32	kWh	R
Total reactive energy of the first quadrant	4146	FC04	float32	kvarh	R
Total reactive energy of the second quadrant	4166	FC04	float32	kvarh	R
Total reactive energy of the third quadrant	4176	FC04	float32	kvarh	R
Total reactive energy of the fourth quadrant	4156	FC04	float32	kvarh	R

Chint DSSU666 Energy Meter 3-phase

Overview

Key readings

Use cases

Installation

Things to watch for

Registers (28)

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