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  3. SDM230

Eastron SDM230 Modbus register map

Also covers SDM230-Modbus, SDM230-2T

Single-phase DIN rail energy meter, direct connection, with two tariffs on the SDM230-2T

  • Official
  • 54 registers
  • Modbus RTU
  • Revision 2 · 2026-10-17

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
Max read
60 registers per request

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

Map

Registers
10 holding registers, 44 input registers
Groups
7
Revision
2 · 2026-10-17
Added
()
File
maps/eastron/sdm230.mbmap.json · 10 KB · history
SHA-256
7d0109285fe816a54d69752168db771ddfa4139ebce1948ff18383c9aff7f26f
Manufacturer
eastroneurope.com

Sources and notes

Source: Eastron, "Eastron SDM230-2T Smart Meter Modbus Protocol Implementation", V1.1

  • Measurements are float32 input registers (FC04); settings are float32 holding registers (FC03 read, FC16 write, one parameter per write).
  • Requests must cover an even number of registers; at most 30 values per read.
  • The tariff registers (1300h-1574h) are for the two-tariff SDM230-2T.
AreaAddressNameTypeAccessUnitScaleDescription
IR 0 float32 ABCD R V
IR 6 float32 ABCD R A
IR 12 float32 ABCD R W
IR 18 float32 ABCD R VA
IR 24 float32 ABCD R var
IR 30 float32 ABCD R
IR 36 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 84 float32 ABCD R W
IR 86 float32 ABCD R W
IR 88 float32 ABCD R W
IR 90 float32 ABCD R W
IR 92 float32 ABCD R W
IR 94 float32 ABCD R W
IR 258 float32 ABCD R A
IR 264 float32 ABCD R A
IR 342 float32 ABCD R kWh
IR 344 float32 ABCD R kvarh
IR 384 float32 ABCD R kWh
IR 386 float32 ABCD R kvarh
IR 4876 float32 ABCD R kWh
IR 4878 float32 ABCD R kWh
IR 4884 float32 ABCD R kWh
IR 4886 float32 ABCD R kWh
IR 4892 float32 ABCD R kWh
IR 4894 float32 ABCD R kWh
IR 4900 float32 ABCD R kvarh
IR 4902 float32 ABCD R kvarh
IR 4908 float32 ABCD R kvarh
IR 4910 float32 ABCD R kvarh
IR 4916 float32 ABCD R kvarh
IR 4918 float32 ABCD R kvarh
IR 5074 float32 ABCD R kW
IR 5076 float32 ABCD R kW
IR 5204 float32 ABCD R kW
IR 5206 float32 ABCD R kW
IR 5472 float32 ABCD R W
IR 5478 float32 ABCD R A
IR 5486 float32 ABCD R W
IR 5492 float32 ABCD R A
HR 12 float32 ABCD RW ms 60, 100 or 200 ms, default 100
HR 18 float32 ABCD RW Default 0
HR 20 float32 ABCD RW Modbus address, default 1
HR 28 float32 ABCD RW Default 2 (9600)
HR 86 float32 ABCD RW Default 4
HR 61456 uint32 ABCD W The protocol writes 00 00 here; requests must cover an even number of registers, so this sends two zero registers with FC16
HR 62720 uint32 ABCD RW BCD, one byte each from the high byte: demand interval (min), slide time (min), scroll time (s), backlight time (min). Default 15-01-00-60. Demand interval 0 = demand not updated; scroll 0 = no scrolling; backlight 0 = always on
HR 63760 uint16 RW Default 0
HR 63776 uint16 RW Default 2
HR 63792 float32 ABCD R h Continuous working time

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