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  3. SDM72CT-M

Eastron SDM72CT-M Modbus register map

Three-phase DIN rail energy meter for current transformers (5 A secondary). Values a wiring system does not use read 0

  • Official
  • 49 registers
  • Modbus RTU
  • Revision 3 · 2026-10-18
  • Identity: serial number

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
12 holding registers, 37 input registers
Groups
4
Revision
3 · 2026-10-18
Added
()
File
maps/eastron/sdm72ct-m.mbmap.json · 10 KB · history
SHA-256
804a8d7af885497c2524a3af8e4e8862f6dd8ae0fc0a56f5ac6b33d04709e1f0
Manufacturer
eastroneurope.com

Device identity

What a tool can read to check that this map fits the connected device (SPEC.md section 4.7). Registers with a role are read like any other register.

Registers
RoleRegisterAddressTypeValues
Serial number Serial number holding 64512 uint32 ABCD

Sources and notes

Source: Zhejiang Eastron Electronic, "Eastron SDM72CT-M User Manual", V1.0, Modbus protocol section

  • Measurements are float32 input registers (FC04); settings are float32 holding registers (FC03 read, FC16 write).
  • Settings marked KPPA need the password (default 1000) written to the access authority register first.
AreaAddressNameTypeAccessUnitScaleDescription
IR 0 float32 ABCD R V Valid on 3P4W, 1P2W; reads 0 otherwise
IR 2 float32 ABCD R V Valid on 3P4W; reads 0 otherwise
IR 4 float32 ABCD R V Valid on 3P4W; reads 0 otherwise
IR 6 float32 ABCD R A
IR 8 float32 ABCD R A Valid on 3P4W, 3P3W; reads 0 otherwise
IR 10 float32 ABCD R A Valid on 3P4W, 3P3W; reads 0 otherwise
IR 12 float32 ABCD R W Valid on 3P4W, 1P2W; reads 0 otherwise
IR 14 float32 ABCD R W Valid on 3P4W; reads 0 otherwise
IR 16 float32 ABCD R W Valid on 3P4W; reads 0 otherwise
IR 18 float32 ABCD R VA Valid on 3P4W, 1P2W; reads 0 otherwise
IR 20 float32 ABCD R VA Valid on 3P4W; reads 0 otherwise
IR 22 float32 ABCD R VA Valid on 3P4W; reads 0 otherwise
IR 24 float32 ABCD R var Valid on 3P4W, 1P2W; reads 0 otherwise
IR 26 float32 ABCD R var Valid on 3P4W; reads 0 otherwise
IR 28 float32 ABCD R var Valid on 3P4W; reads 0 otherwise
IR 30 float32 ABCD R Valid on 3P4W, 1P2W; reads 0 otherwise
IR 32 float32 ABCD R Valid on 3P4W; reads 0 otherwise
IR 34 float32 ABCD R Valid on 3P4W; reads 0 otherwise
IR 42 float32 ABCD R V Valid on 3P4W; reads 0 otherwise
IR 46 float32 ABCD R A
IR 48 float32 ABCD R A
IR 52 float32 ABCD R W
IR 56 float32 ABCD R VA
IR 60 float32 ABCD R var
IR 62 float32 ABCD R
IR 70 float32 ABCD R Hz
IR 72 float32 ABCD R kWh
IR 74 float32 ABCD R kWh
IR 76 float32 ABCD R kvarh
IR 78 float32 ABCD R kvarh
IR 200 float32 ABCD R V Valid on 3P4W, 3P3W; reads 0 otherwise
IR 202 float32 ABCD R V Valid on 3P4W, 3P3W; reads 0 otherwise
IR 204 float32 ABCD R V Valid on 3P4W, 3P3W; reads 0 otherwise
IR 206 float32 ABCD R V Valid on 3P4W, 3P3W; reads 0 otherwise
IR 224 float32 ABCD R A Valid on 3P4W; reads 0 otherwise
IR 342 float32 ABCD R kWh
IR 344 float32 ABCD R kvarh
HR 12 float32 ABCD RW ms 60, 100 or 200 ms, default 200
HR 14 float32 ABCD RW Write the password to get access to the protected settings
HR 18 float32 ABCD RW Default 0
HR 20 float32 ABCD RW Default 1
HR 22 float32 ABCD RW
HR 24 float32 ABCD RW Read gives the password, write changes it. Default 1000
HR 28 float32 ABCD RW Default 2 (9600)
HR 32 float32 ABCD RW Default 1. Needs KPPA
HR 58 float32 ABCD RW s Default 0 = no scrolling
HR 60 float32 ABCD RW min Default 0 = always on
HR 86 float32 ABCD RW Default 4
HR 64512 uint32 ABCD R

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