Eastron SDM320 Modbus register map
Also covers SDM320C
- Official
- 23 registers
- Revision 3 · 2026-11-10
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 TCP and RTUdefault
- Unit ID
- 1default
- TCP port
- 502default
- Serial
- 9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit defaults
- 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
- 23 input registers
- Revision
- 3 · 2026-11-10
- Added
- ()
- File
- maps/eastron/sdm320.mbmap.json · 4 KB · history
- SHA-256
- 9cc4201044bfa0d344c5470104889bb7924231a68f9fae2e053ec11d10145021
- Manufacturer
- eastroneurope.com
Sources and notes
- SDM320C User Manual · version V1.2 section 4.1 input registers (FC04); 4.2 holding registers (FC03/10)
Source: Zhejiang Eastron Electronic, "SDM320C User Manual V1.2", sections 4.1 and 4.2 (Modbus RTU register tables)
- Eastron SDM320 / SDM320C single-phase energy meter (RS485 Modbus RTU).
- Measurements are float32 input registers (FC04), big-endian (bytes and words), 0-based addresses.
- Monthly and multi-rate energy registers of older catalogues are not in the SDM320C manual and were removed.
| Area | Address | Name | Type | Access | Unit | Scale | Description |
|---|---|---|---|---|---|---|---|
| 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 | Negative for export current | |||
| 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 | 80 | float32 ABCD | R | kVAh | |||
| 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 | 108 | float32 ABCD | R | var | |||
| IR | 110 | float32 ABCD | R | var | |||
| IR | 258 | float32 ABCD | R | A | |||
| IR | 264 | float32 ABCD | R | A | |||
| IR | 342 | float32 ABCD | R | kWh | |||
| IR | 344 | float32 ABCD | R | kvarh |
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).