Is the SDM72DM-V2 the same meter as the SDM72D-M-2?

Yes. Eastron's user manual for this meter is titled SDM72D-M-2, and the meter reports meter code 0089 hex at holding register FC02 hex.

Which register holds import and export power?

Total import active power is at address 1280 (0500 hex) and total export active power at 1282 (0502 hex). Total system power at address 52 is signed, so it combines both directions in one value.

Why does the meter return an exception?

Each request can read at most 30 parameters, and a parameter is two registers. A request for more returns a Modbus exception, so split long reads.

Why can I not change the baud rate over Modbus?

Key settings are password protected. Write the meter's password to the programming authorisation register at 000E hex first; the default password is 1000.

What does Total active energy count?

Import plus export. Net active energy at address 396 is import minus export, which is the figure to use for a site that exports solar power.

Can it be used on a single-phase circuit?

Yes. Set the system type to 1P2W in the set-up menu or write 1 to holding register 000A hex. The L2 and L3 values then read zero.

Eastron SDM72DM-V2 Modbus register map with EpiSensor Edge

Compatibility

Compatible with EpiSensor Edge over Modbus RTU.

Connect its RS-485 port to a Modbus Interface or to a serial interface on the Gateway. Edge polls it with its Modbus client.

Edge reads 32 values from it, listed under Interface.

Connect it with

Modbus Interface ZMB-3X
From €399 ex VAT Configure Modbus Interface
Gateway ZGW-20
From €899 ex VAT Configure Gateway

Specifications

The SDM72DM-V2, which Eastron's manual calls the SDM72D-M-2, is a three-phase, four-wire energy meter four DIN modules wide, for direct connection up to 100 A without current transformers. It measures phase and line voltage, current, active, apparent and reactive power, power factor and frequency, and keeps import, export and total counters for active energy, a total reactive energy counter and resettable partial counters for a chosen period.¹

Power: Self-powered from the measured supply. Supplied from its live and neutral voltage inputs; it needs no external auxiliary supply.⁴
Nominal voltage: 3 × 230/400 V AC, 80 to 120 % of nominal¹
Current: 10(100) A direct connected; starts at 0.4 % of 10 A¹
Systems: 3-phase 4-wire (default) or 1-phase 2-wire¹
Frequency: 50 or 60 Hz; 50 Hz for MID versions¹
Active energy accuracy: Class 1 (IEC 62053-21); Class B (EN 50470-1/3) on MID versions¹
Reactive energy accuracy: Class 2 (IEC 62053-23)¹
Voltage and current accuracy: 0.5 %¹
Burden: ≤ 2 W/10 VA voltage circuit, ≤ 4 VA current circuit¹
Pulse output: Passive, 1000 imp/kWh import, 35 ms¹
Display: Backlit LCD, up to 999999.9 kWh¹
Dimensions: 72 × 100 × 66 mm (W × H × D), 35 mm DIN rail¹
Protection: IP51, indoor use¹
Operating temperature: -25 to 55 °C; -40 to 70 °C optional¹

Where it is used

Three-phase distribution board and sub-feeder metering up to 100 A without current transformers.
Transformer and distribution board monitoring
Solar PV self-consumption and export on three-phase supplies, from the separate import and export power and energy registers.
Solar PV monitoring
Metering three-phase EV chargers up to 100 A for load management.
EV charging load management

Interface

This register map is for the SDM72DM-V2 (SDM72D-M-2).

Communication settings

Protocol: Modbus RTU over RS-485
Unit address: 1 to 247, default 1
Baud rate: 1200, 2400, 4800, 9600 or 19200 bit/s, default 9600
Parity and stop bits: None, even or odd parity, 1 or 2 stop bits; default no parity, 1 stop bit
Read functions: FC04 for measurements, FC03 for settings; FC16 writes one setting per message
Request size: Up to 30 parameters per request
Word order: Set automatically by the meter to normal or reverse
Read with: FC04 (input registers)
Word order: High word first on every value
Addresses: Zero-based PDU addresses, as sent on the bus

From SDM72D-M-2 user manual V1.1.1¹.

Register map

Download

Point	Address	Hex	Format	Scale	Unit
Voltage L1-N	0	`0x0000`	FLOAT32	×1	V
Voltage L2-N	2	`0x0002`	FLOAT32	×1	V
Voltage L3-N	4	`0x0004`	FLOAT32	×1	V
Current L1	6	`0x0006`	FLOAT32	×1	A
Current L2	8	`0x0008`	FLOAT32	×1	A
Current L3	10	`0x000A`	FLOAT32	×1	A
Active Power L1	12	`0x000C`	FLOAT32	×1	W
Active Power L2	14	`0x000E`	FLOAT32	×1	W
Active Power L3	16	`0x0010`	FLOAT32	×1	W
Reactive Power L1	24	`0x0018`	FLOAT32	×1	VAr
Reactive Power L2	26	`0x001A`	FLOAT32	×1	VAr
Reactive Power L3	28	`0x001C`	FLOAT32	×1	VAr
Power Factor L1	30	`0x001E`	FLOAT32	×1	-
Power Factor L2	32	`0x0020`	FLOAT32	×1	-
Power Factor L3	34	`0x0022`	FLOAT32	×1	-
Average Voltage L-N	42	`0x002A`	FLOAT32	×1	V
Total Active Power	52	`0x0034`	FLOAT32	×1	W
Total Apparent Power	56	`0x0038`	FLOAT32	×1	VA
Total Reactive Power	60	`0x003C`	FLOAT32	×1	VAr
Total Power Factor	62	`0x003E`	FLOAT32	×1	-
Frequency	70	`0x0046`	FLOAT32	×1	Hz
Import Active Energy	72	`0x0048`	FLOAT32	×1	kWh
Export Active Energy	74	`0x004A`	FLOAT32	×1	kWh
Voltage L1-L2	200	`0x00C8`	FLOAT32	×1	V
Voltage L2-L3	202	`0x00CA`	FLOAT32	×1	V
Voltage L3-L1	204	`0x00CC`	FLOAT32	×1	V
Neutral Current	224	`0x00E0`	FLOAT32	×1	A
Total Active Energy	342	`0x0156`	FLOAT32	×1	kWh
Total Reactive Energy	344	`0x0158`	FLOAT32	×1	kVArh
Net Active Energy	396	`0x018C`	FLOAT32	×1	kWh
Total Import Active Power	1280	`0x0500`	FLOAT32	×1	W
Total Export Active Power	1282	`0x0502`	FLOAT32	×1	W

Download the SDM72DM-V2 register map as CSV

Edge template

This JSON file supplies the register map. Applying it to an existing meter replaces its sensor list while retaining the site connection, unit ID and enable state.

Model	Connection	Points	Version	Updated	Download
SDM72DM-V2	Modbus RTU over RS-485	32	1.0.0	23 Sep 2026	Download

Downloads need a signed-in account with Edge download access.

Use the template in Edge

Import the JSON file
On the target Gateway in Edge, open Settings, then Device Templates. Choose Import and select the downloaded JSON file. Confirm that the model and template name match your device.
Load the map for your meter
In the Modbus device wizard, choose the site connection and unit ID, then use Load Template to select the imported map. For an existing device, apply the template to that exact model. Its connection, unit ID and enable state are retained.
Test a reading
Use Test in the wizard and compare a known reading with the meter display. Check its unit, sign and scale, then confirm that timestamps keep advancing. These starter maps are read-only and leave exports off until you configure them.

Setup

Check the model
The Modbus versions of the SDM72 range, including this SDM72DM-V2, have the RS-485 port. The SDM72DR and SDM72BI have a pulse output only.⁴
Wire the bus
Run a two-wire RS-485 pair from a ZMB-31 or the Gateway's serial interface to the meter's A+ and B- terminals, A to A and B to B. Eastron rates one bus for 64 meters over up to 1,000 m.²
Set the address and speed
Hold the Enter button for 3 seconds, enter the password (1000 by default), then set a unique Modbus address from 1 to 247, the baud rate, parity and stop bits. The defaults are address 1, 9600 bit/s, no parity and 1 stop bit.¹
Set the system type
Leave the system at 3P4W for a three-phase supply. Choose 1P2W only for a single-phase circuit; the L2 and L3 registers then read zero.¹
Read one register
Import the Edge template and read Current L1 at input register 6 with a load running. Compare it with the display, then check Voltage L3-N at address 4 before you enable the rest.¹

Before you rely on the decode

The addresses are Eastron's 30001-style register numbers less 30001, so Voltage L1-N (30001) is address 0 and Total Active Energy (30343) is address 342.

Every value is a 32-bit IEEE 754 float in two registers. The template reads high word first with big-endian bytes. Eastron's manual says the meter sets its word order to normal or reverse automatically, so compare a steady voltage with the display before you trust the rest.

Eastron's register table skips 30005. Voltage L3-N at address 4 follows the L1 and L2 pattern and is taken from the mbmd driver and the ioBroker register list for this meter; confirm it against the display on a three-phase supply.

Total Active Energy counts import plus export; Net Active Energy is import minus export.

Common questions

Is the SDM72DM-V2 the same meter as the SDM72D-M-2?: Yes. Eastron's user manual for this meter is titled SDM72D-M-2, and the meter reports meter code 0089 hex at holding register FC02 hex.¹
Which register holds import and export power?: Total import active power is at address 1280 (0500 hex) and total export active power at 1282 (0502 hex). Total system power at address 52 is signed, so it combines both directions in one value.¹
Why does the meter return an exception?: Each request can read at most 30 parameters, and a parameter is two registers. A request for more returns a Modbus exception, so split long reads.¹
Why can I not change the baud rate over Modbus?: Key settings are password protected. Write the meter's password to the programming authorisation register at 000E hex first; the default password is 1000.¹
What does Total active energy count?: Import plus export. Net active energy at address 396 is import minus export, which is the figure to use for a site that exports solar power.¹
Can it be used on a single-phase circuit?: Yes. Set the system type to 1P2W in the set-up menu or write 1 to holding register 000A hex. The L2 and L3 values then read zero.¹

Related devices

Sources

SDM72D-M-2 user manual V1.1.1 (opens in a new tab) (PDF) Eastron
SDM72D-M and -2T DIN rail mounted, three phase, 100A datasheet (opens in a new tab) (PDF) Eastron
SDM72D-M user manual V1.1 (opens in a new tab) (PDF) Eastron
SDM72D series product page (opens in a new tab) Eastron Europe
SDM72V2 register driver (opens in a new tab) mbmd · eef6045ae30e46b9ddaf175f0dfbb4c4e26247e3
Eastron SDM72DM-V2 device template (opens in a new tab) evcc · revision 8160673647fb
Eastron SDM72DM-V2 definition (opens in a new tab) iobroker-modbus-templates · revision e8bb45054497