Eastron SDM72D-M Modbus register map
Three-phase DIN rail energy meter with a reduced Modbus register set: total power and import/export energy
- Official
- 16 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.
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
- 7 holding registers, 9 input registers
- Groups
- 4
- Revision
- 3 · 2026-10-18
- Added
- ()
- File
- maps/eastron/sdm72d-m.mbmap.json · 4 KB · history
- SHA-256
- 2fe0ce72f5e02aef96f8575e364b7edc916dada5d569c0ba0b3b2072bfdd3274
- Manufacturer
- eastroneurope.com
Sources and notes
- SDM72D-M Modbus Protocol · version V1.1
Source: Zhejiang Eastron Electronic, "SDM72D-M Modbus Protocol", V1.1
- Measurements are float32 input registers (FC04); settings are float32 holding registers (FC03 read, FC10 write).
- Settings marked as protected need the password (default 1000) written to the password register first.
| Area | Address | Name | Type | Access | Unit | Scale | Description |
|---|---|---|---|---|---|---|---|
| IR | 52 | float32 ABCD | R | W | |||
| IR | 72 | float32 ABCD | R | kWh | |||
| IR | 74 | float32 ABCD | R | kWh | |||
| IR | 342 | float32 ABCD | R | kWh | Import + export | ||
| IR | 384 | float32 ABCD | R | kWh | Import + export | ||
| IR | 388 | float32 ABCD | R | kWh | |||
| IR | 390 | float32 ABCD | R | kWh | |||
| IR | 1280 | float32 ABCD | R | W | |||
| IR | 1282 | float32 ABCD | R | W | |||
| HR | 18 | float32 ABCD | RW | Default 0 | |||
| HR | 20 | float32 ABCD | RW | Default 1 | |||
| HR | 24 | float32 ABCD | RW | Write the password (default 1000) to unlock the protected registers | |||
| HR | 28 | float32 ABCD | RW | Default 2 (9600) | |||
| HR | 58 | float32 ABCD | RW | s | 0 = no automatic scrolling (default) | ||
| HR | 60 | float32 ABCD | RW | min | 0 = backlight always on (default) | ||
| HR | 61456 | uint16 | W |
No registers match
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Help improve this map
- I tested it on a deviceReport whether it worked, even if you did not write the map.
- Suggest a correctionEdit the file on GitHub; it opens a pull request.
- Report a problemA wrong address, type, scale or byte order.
- Read the formatWhat each key of the file means (SPEC.md).