Eastron SDM72D-M Modbus register map

Also searched as: SDM72DM · SDM72D-Modbus · SDM72D

16 Modbus registers of the Eastron SDM72D-M, with the address on the wire, the 30001-style reference, data type, byte order, unit and scale. Transcribed from SDM72D-M Modbus Protocol (V1.1).

Three-phase four-wire DIN-rail energy meter with RS485 Modbus RTU and a short register list; every value is a 32-bit float.

Registers Read it by name

AI assistant · MCP Product UI · sample data

Map: eastron/sdm72d-mRead-only

MCP · read_named reading… ✓ 2 values · 38 ms

read_named(device: "sdm72d-1", keys: ["active_power_total", "import_active_energy"])

active_power_total 8,420 W

import_active_energy 48,211.6 kWh

Device type: Energy meter
Registers: 16
Interfaces: Modbus RTU
Default unit ID: 1
Serial settings: 9600 baud, 8 data bits, no parity, 1 stop bit

Hardware verification

Not yet verified on hardware. The map is transcribed from the vendor document and checked against it by script; check the first readings against the device display.

Verify it on your device What the levels mean

Connection notes

Read and write floats in register pairs (4 bytes per parameter).
Up to 30 parameters per request.
Write holding registers with function 16 (10h), one parameter per message.
Neither document states the float word order; the user manual says the meter sets normal or reverse word order automatically.
The SDM72DM-V2 has a longer register map in a different document; check yours before relying on this map.

Registers

Grouped as in the vendor document.

Power 3 registers

Name and key	Reference	Address	Type	Byte order	Unit
Total system power`active_power_total`	30053	0x0034	float32	ABCD	W
Total import active power`import_active_power_total`	31281	0x0500	float32	ABCD	W
Total export active power`export_active_power_total`	31283	0x0502	float32	ABCD	W

Energy 6 registers

Name and key	Reference	Address	Type	Byte order	Unit
Total import active energy`import_active_energy`	30073	0x0048	float32	ABCD	kWh
Total export active energy`export_active_energy`	30075	0x004A	float32	ABCD	kWh
Total active energy`total_active_energy`	30343	0x0156	float32	ABCD	kWh
Resettable total active energy`resettable_total_active_energy`	30385	0x0180	float32	ABCD	kWh
Resettable import active energy`resettable_import_active_energy`	30389	0x0184	float32	ABCD	kWh
Resettable export active energy`resettable_export_active_energy`	30391	0x0186	float32	ABCD	kWh

Setup 7 registers

Name and key	Reference	Address	Type	Byte order	Unit
Parity and stop bits`parity_stop`	40019	0x0012	float32	ABCD
Modbus address`modbus_address`	40021	0x0014	float32	ABCD
Password`password`	40025	0x0018	float32	ABCD
Network baud rate`baud_rate`	40029	0x001C	float32	ABCD
Automatic scroll display time`scroll_time`	40059	0x003A	float32	ABCD	s
Backlight time`backlight_time`	40061	0x003C	float32	ABCD	min
Reset`reset_resettable_energy`	461457	0xF010	uint16

Source documents

SDM72D-M Modbus Protocol , Eastron, V1.1 (accessed 2026-11-09) Copy hosted by Vekto, an Eastron reseller; Eastron publishes no copy that can be downloaded without a login.
Eastron SDM72D-M User Manual , Eastron, V1.5 (accessed 2026-11-09) Copy hosted by Vekto. Part 3 repeats the register table and gives the 30-parameter read limit.

View this map on GitHub (YAML)

Read it by name

Read the SDM72D-M with an AI assistant

The Proxus Industrial MCP Server includes this map. Set it on the device, and Claude, Cursor or VS Code reads registers by key with the right type, byte order, scale and unit. It only reads.

This device speaks Modbus RTU: reach it through a Modbus TCP gateway and use the gateway’s address with the device’s unit ID.

Get the MCP server

proxus-mcp.json

{
  "devices": {
    "sdm72d-1": {
      "protocol": "modbus-tcp",
      "host": "192.168.10.40",
      "unit_id": 1,
      "map": "eastron/sdm72d-m"
    }
  }
}

Ask your assistant

Read active_power_total, import_active_power_total, export_active_power_total from sdm72d-1.

The tool call it makes

read_named(device: "sdm72d-1", keys: ["active_power_total", "import_active_power_total", "export_active_power_total"])

Have this device? Verify the map.

Ask your assistant to run verify_device_map. It reads every register once, read-only, checks that the values are plausible and asks you to compare two values with the display. You get a report and a prefilled GitHub issue to submit; your name goes on this map’s verified list.

How verification works

Collecting from many devices?

Proxus reads Modbus TCP and RTU devices next to the machines, keeps the history and delivers the values to dashboards, databases and AI.

Modbus in Proxus Industrial connectivity