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Chint DTSU666 / DSSU666 Modbus register map

Three-phase DIN rail energy meter with RS485 (DTSU666 four-wire, DSSU666 three-wire), bidirectional

  • Official
  • 43 registers
  • Modbus RTU
  • Revision 2

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

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Communication

Protocol
Modbus RTU
Unit ID
1
Serial
9600 8N1 · 9600 baud, 8 data bits, none parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
0-based

Connection values are defaults: the device may be configured differently.

Map

Registers
43 holding registers
Groups
7
Revision
2
Added
()
File
maps/chint/dtsu666.mbmap.json · 9 KB · history
SHA-256
1f835ea9dfff83bdd58268b2a9483efcde64f191cb23063141ea302fae2bb5cc
Manufacturer
chintglobal.com

Sources and notes

Source: Chint, "DTSU666.001 / DSSU666.001 series User Manual", ZTW0.464.0104 (2023-11-14); https://www.chintglobal.com/content/dam/chint/global/product-center/instruments-meters/electricity-meter/din-rail-meter/dtsu666/manual/DTSU666%20DSSU666%20User%20Manual.pdf

  • Chint DTSU666 (three-phase four-wire) and DSSU666 (three-phase three-wire) DIN rail energy meters, Modbus RTU.
  • This is the meter often supplied with solar inverters as a grid meter.
  • Measurements and energies are IEEE 754 floats (ABCD). The electricity data block is in raw units: apply the scale column (e.g. a voltage of 2301.5 means 230.15 V).
  • All values are on the secondary side: with CTs or VTs, multiply by the CT ratio (0x0006) and the VT ratio (0x0007 x 0.1).
  • Rows marked "4-wire only" read nothing useful on a DSSU666 / three-wire connection.
AreaAddressNameTypeAccessUnitScaleDescription
HR 0 int16 R
HR 1 int16 RW 1-9999
HR 2 int16 W
HR 3 int16 RW
HR 6 int16 RW 1-9999
HR 7 int16 RW ×0.1 0.1-999.9
HR 10 int16 RW s
HR 11 int16 RW min
HR 44 int16 RW
HR 45 int16 RW
HR 46 int16 RW 1-247
HR 8192 float32 ABCD R V ×0.1
HR 8194 float32 ABCD R V ×0.1
HR 8196 float32 ABCD R V ×0.1
HR 8198 float32 ABCD R V ×0.1 4-wire only
HR 8200 float32 ABCD R V ×0.1 4-wire only
HR 8202 float32 ABCD R V ×0.1 4-wire only
HR 8204 float32 ABCD R A ×0.001
HR 8206 float32 ABCD R A ×0.001
HR 8208 float32 ABCD R A ×0.001
HR 8210 float32 ABCD R W ×0.1 Positive = import
HR 8212 float32 ABCD R W ×0.1
HR 8214 float32 ABCD R W ×0.1 4-wire only
HR 8216 float32 ABCD R W ×0.1
HR 8218 float32 ABCD R var ×0.1
HR 8220 float32 ABCD R var ×0.1
HR 8222 float32 ABCD R var ×0.1 4-wire only
HR 8224 float32 ABCD R var ×0.1
HR 8234 float32 ABCD R ×0.001 Positive = inductive, negative = capacitive
HR 8236 float32 ABCD R ×0.001 4-wire only
HR 8238 float32 ABCD R ×0.001 4-wire only
HR 8240 float32 ABCD R ×0.001 4-wire only
HR 8260 float32 ABCD R Hz ×0.01
HR 4126 float32 ABCD R kWh
HR 4128 float32 ABCD R kWh
HR 4130 float32 ABCD R kWh
HR 4132 float32 ABCD R kWh
HR 4134 float32 ABCD R kWh
HR 4136 float32 ABCD R kWh
HR 4138 float32 ABCD R kWh
HR 4140 float32 ABCD R kWh
HR 4142 float32 ABCD R kWh
HR 4144 float32 ABCD R kWh

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