Eastron SDM530-MT Modbus register map

Three-phase four-wire multi-tariff DIN rail energy meter for current transformers, with four tariffs and twelve months of history

Official
77 registers
Modbus RTU
Revision 3 · 2026-10-18

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: 80 registers per request

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

Map

Registers: 13 holding registers, 64 input registers
Groups: 5
Revision: 3 · 2026-10-18
Added: 2026-10-14 (2026-10-14)
File: maps/eastron/sdm530-mt.mbmap.json · 14 KB · history
SHA-256: d139e6371060823b3247a5387a87c22bab6d3665069c06bc7ddc8dea5c8cc1f2
Manufacturer: eastroneurope.com

Sources and notes

Eastron SDM530-MT User Manual (including the Modbus protocol)
sections 1.2 and 1.3 of the protocol

Source: Eastron, "Eastron SDM530-MT User Manual" with the SDM530-MT Modbus protocol

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 40 values per read.
Protected settings need the password written to the password register; it times out after one minute unless the password lock register is read.
Not in this map: the monthly history blocks (input registers 0x0201-0x0321 and 0xF101-0xFB01, five values per block: total and tariffs 1-4), the clock (0xF000), the demand/display setup (0xF500) and the tariff schedule (0xF700).

Area	Address	Type	Access	Unit	Description
IR	0	float32 ABCD	R	V
IR	2	float32 ABCD	R	V
IR	4	float32 ABCD	R	V
IR	6	float32 ABCD	R	A
IR	8	float32 ABCD	R	A
IR	10	float32 ABCD	R	A
IR	12	float32 ABCD	R	W
IR	14	float32 ABCD	R	W
IR	16	float32 ABCD	R	W
IR	18	float32 ABCD	R	VA
IR	20	float32 ABCD	R	VA
IR	22	float32 ABCD	R	VA
IR	24	float32 ABCD	R	var
IR	26	float32 ABCD	R	var
IR	28	float32 ABCD	R	var
IR	30	float32 ABCD	R
IR	32	float32 ABCD	R
IR	34	float32 ABCD	R
IR	36	float32 ABCD	R	°
IR	38	float32 ABCD	R	°
IR	40	float32 ABCD	R	°
IR	42	float32 ABCD	R	V
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	66	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	80	float32 ABCD	R	kVAh
IR	82	float32 ABCD	R	Ah
IR	84	float32 ABCD	R	W
IR	86	float32 ABCD	R	W
IR	100	float32 ABCD	R	VA
IR	102	float32 ABCD	R	VA
IR	104	float32 ABCD	R	A
IR	106	float32 ABCD	R	A
IR	200	float32 ABCD	R	V
IR	202	float32 ABCD	R	V
IR	204	float32 ABCD	R	V
IR	206	float32 ABCD	R	V
IR	224	float32 ABCD	R	A
IR	254	float32 ABCD	R	°
IR	258	float32 ABCD	R	A
IR	260	float32 ABCD	R	A
IR	262	float32 ABCD	R	A
IR	264	float32 ABCD	R	A
IR	266	float32 ABCD	R	A
IR	268	float32 ABCD	R	A
IR	342	float32 ABCD	R	kWh
IR	344	float32 ABCD	R	kvarh
IR	2000	float32 ABCD	R	kWh
IR	2002	float32 ABCD	R	kWh
IR	2004	float32 ABCD	R	kWh
IR	2006	float32 ABCD	R	kWh
IR	2256	float32 ABCD	R	kWh
IR	2258	float32 ABCD	R	kWh
IR	2260	float32 ABCD	R	kWh
IR	2262	float32 ABCD	R	kWh
HR	0	float32 ABCD	R	min	Minutes into the first demand period; demand values are valid once it reaches the demand period
HR	2	float32 ABCD	RW	min	0, 5, 8, 10, 15, 20, 30 or 60 minutes, default 60. 0 makes demand show the present value and max demand the maximum since the last reset
HR	6	float32 ABCD	R	V
HR	8	float32 ABCD	R	A
HR	12	float32 ABCD	RW	ms	60, 100 or 200 ms, default 100
HR	14	float32 ABCD	RW		Writing any value locks; reading also restarts the one-minute password timeout
HR	18	float32 ABCD	RW		Default 0
HR	20	float32 ABCD	RW		Modbus address, default 1. Takes effect after a restart
HR	22	float32 ABCD	RW		Default 0 (400 imp/kWh)
HR	24	float32 ABCD	RW		Write the password to unlock the protected registers
HR	28	float32 ABCD	RW		Default 2 (9600)
HR	36	float32 ABCD	R	W	Rated system power, e.g. system volts x system amps x 3 on 3P4W
HR	86	float32 ABCD	RW

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Read the formatWhat each key of the file means (SPEC.md).