Eastron · Energy meter
SDM630MCT (CT-operated three-phase DIN meter) Modbus register map
Default configuration
- Protocol
- RS485
- Port
- 502
- Unit ID
- 1
- Addressing
- 0-based
- Byte order
- Big endian
- Word order
- High word first
- Baud rate
- 9600
- Parity
- None
- Data bits
- 8
- Stop bits
- 1
This device has an RS-485 interface. Reach it through a Modbus RTU-to-TCP gateway, configured with the factory serial settings above.
Register map
| Address | Count | Name | Type | Unit | Scale | Access |
|---|---|---|---|---|---|---|
| 0 | 2 | Phase 1 line to neutral volts | Float32 | V | 1 | R |
| 2 | 2 | Phase 2 line to neutral volts | Float32 | V | 1 | R |
| 4 | 2 | Phase 3 line to neutral volts | Float32 | V | 1 | R |
| 6 | 2 | Phase 1 current | Float32 | A | 1 | R |
| 8 | 2 | Phase 2 current | Float32 | A | 1 | R |
| 10 | 2 | Phase 3 current | Float32 | A | 1 | R |
| 12 | 2 | Phase 1 active power | Float32 | W | 1 | R |
| 14 | 2 | Phase 2 active power | Float32 | W | 1 | R |
| 16 | 2 | Phase 3 active power | Float32 | W | 1 | R |
| 18 | 2 | Phase 1 apparent power | Float32 | VA | 1 | R |
| 20 | 2 | Phase 2 apparent power | Float32 | VA | 1 | R |
| 22 | 2 | Phase 3 apparent power | Float32 | VA | 1 | R |
| 24 | 2 | Phase 1 reactive power | Float32 | VAr | 1 | R |
| 26 | 2 | Phase 2 reactive power | Float32 | VAr | 1 | R |
| 28 | 2 | Phase 3 reactive power | Float32 | VAr | 1 | R |
| 30 | 2 | Phase 1 power factor Sign shows the direction of the current: positive = forward, negative = reverse. | Float32 | - | 1 | R |
| 32 | 2 | Phase 2 power factor | Float32 | - | 1 | R |
| 34 | 2 | Phase 3 power factor | Float32 | - | 1 | R |
| 36 | 2 | Phase 1 phase angle | Float32 | degrees | 1 | R |
| 38 | 2 | Phase 2 phase angle | Float32 | degrees | 1 | R |
| 40 | 2 | Phase 3 phase angle | Float32 | degrees | 1 | R |
| 42 | 2 | Average line to neutral volts | Float32 | V | 1 | R |
| 46 | 2 | Average line current | Float32 | A | 1 | R |
| 48 | 2 | Sum of line currents | Float32 | A | 1 | R |
| 52 | 2 | Total system power | Float32 | W | 1 | R |
| 56 | 2 | Total system voltamps | Float32 | VA | 1 | R |
| 60 | 2 | Total system VAr | Float32 | VAr | 1 | R |
| 62 | 2 | Total system power factor | Float32 | - | 1 | R |
| 66 | 2 | Total system phase angle | Float32 | degrees | 1 | R |
| 70 | 2 | Frequency of supply voltages | Float32 | Hz | 1 | R |
| 72 | 2 | Total import kWh | Float32 | kWh | 1 | R |
| 74 | 2 | Total export kWh | Float32 | kWh | 1 | R |
| 76 | 2 | Total import kVArh | Float32 | kVArh | 1 | R |
| 78 | 2 | Total export kVArh | Float32 | kVArh | 1 | R |
| 80 | 2 | Total VAh | Float32 | kVAh | 1 | R |
| 82 | 2 | Ah | Float32 | Ah | 1 | R |
| 84 | 2 | Total system power demand Power sum demand, calculated as import - export. | Float32 | W | 1 | R |
| 86 | 2 | Maximum total system power demand | Float32 | W | 1 | R |
| 100 | 2 | Total system VA demand | Float32 | VA | 1 | R |
| 102 | 2 | Maximum total system VA demand | Float32 | VA | 1 | R |
| 104 | 2 | Neutral current demand | Float32 | A | 1 | R |
| 106 | 2 | Maximum neutral current demand | Float32 | A | 1 | R |
| 108 | 2 | Total system reactive power demand | Float32 | VAr | 1 | R |
| 110 | 2 | Maximum total system reactive power demand | Float32 | VAr | 1 | R |
| 200 | 2 | Line 1 to line 2 volts | Float32 | V | 1 | R |
| 202 | 2 | Line 2 to line 3 volts | Float32 | V | 1 | R |
| 204 | 2 | Line 3 to line 1 volts | Float32 | V | 1 | R |
| 206 | 2 | Average line to line volts | Float32 | V | 1 | R |
| 224 | 2 | Neutral current | Float32 | A | 1 | R |
| 234 | 2 | Phase 1 L/N volts THD | Float32 | % | 1 | R |
| 236 | 2 | Phase 2 L/N volts THD | Float32 | % | 1 | R |
| 238 | 2 | Phase 3 L/N volts THD | Float32 | % | 1 | R |
| 240 | 2 | Phase 1 current THD | Float32 | % | 1 | R |
| 242 | 2 | Phase 2 current THD | Float32 | % | 1 | R |
| 244 | 2 | Phase 3 current THD | Float32 | % | 1 | R |
| 248 | 2 | Average line to neutral volts THD | Float32 | % | 1 | R |
| 250 | 2 | Average line current THD | Float32 | % | 1 | R |
| 254 | 2 | Total system power factor, phase angle form The vendor table labels this row "Total system power factor (1)" but gives degrees as the unit. | Float32 | degrees | 1 | R |
| 258 | 2 | Phase 1 current demand | Float32 | A | 1 | R |
| 260 | 2 | Phase 2 current demand | Float32 | A | 1 | R |
| 262 | 2 | Phase 3 current demand | Float32 | A | 1 | R |
| 264 | 2 | Maximum phase 1 current demand | Float32 | A | 1 | R |
| 266 | 2 | Maximum phase 2 current demand | Float32 | A | 1 | R |
| 268 | 2 | Maximum phase 3 current demand | Float32 | A | 1 | R |
| 334 | 2 | Line 1 to line 2 volts THD | Float32 | % | 1 | R |
| 336 | 2 | Line 2 to line 3 volts THD | Float32 | % | 1 | R |
| 338 | 2 | Line 3 to line 1 volts THD | Float32 | % | 1 | R |
| 340 | 2 | Average line to line volts THD | Float32 | % | 1 | R |
| 342 | 2 | Total kWh (import + export) | Float32 | kWh | 1 | R |
| 344 | 2 | Total kVArh (import + export) | Float32 | kVArh | 1 | R |
| 346 | 2 | L1 import kWh | Float32 | kWh | 1 | R |
| 348 | 2 | L2 import kWh | Float32 | kWh | 1 | R |
| 350 | 2 | L3 import kWh | Float32 | kWh | 1 | R |
| 352 | 2 | L1 export kWh | Float32 | kWh | 1 | R |
| 354 | 2 | L2 export kWh | Float32 | kWh | 1 | R |
| 356 | 2 | L3 export kWh | Float32 | kWh | 1 | R |
| 358 | 2 | L1 total kWh | Float32 | kWh | 1 | R |
| 360 | 2 | L2 total kWh | Float32 | kWh | 1 | R |
| 362 | 2 | L3 total kWh | Float32 | kWh | 1 | R |
| 364 | 2 | L1 import kVArh | Float32 | kVArh | 1 | R |
| 366 | 2 | L2 import kVArh | Float32 | kVArh | 1 | R |
| 368 | 2 | L3 import kVArh | Float32 | kVArh | 1 | R |
| 370 | 2 | L1 export kVArh | Float32 | kVArh | 1 | R |
| 372 | 2 | L2 export kVArh | Float32 | kVArh | 1 | R |
| 374 | 2 | L3 export kVArh | Float32 | kVArh | 1 | R |
| 376 | 2 | L1 total kVArh | Float32 | kVArh | 1 | R |
| 378 | 2 | L2 total kVArh | Float32 | kVArh | 1 | R |
| 380 | 2 | L3 total kVArh | Float32 | kVArh | 1 | R |
| 384 | 2 | Resettable total active energy | Float32 | kWh | 1 | R |
| 386 | 2 | Resettable total reactive energy | Float32 | kVArh | 1 | R |
| 388 | 2 | Resettable import active energy | Float32 | kWh | 1 | R |
| 390 | 2 | Resettable export active energy | Float32 | kWh | 1 | R |
| 392 | 2 | Resettable import reactive energy | Float32 | kVArh | 1 | R |
| 394 | 2 | Resettable export reactive energy | Float32 | kVArh | 1 | R |
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Notes
RS-485 device: reach it through a Modbus RTU-to-TCP gateway using the factory serial settings above. Source: Eastron "SDM630MCT Series - MODBUS Protocol", V1.7, section 1.2.1 (input registers, table 1.2.1) and section 1.3.1 (holding register parameters, table 1.3.1), published at https://eastroneurope.com/images/uploads/products/protocol/SDM630MCT_MODBUS_Protocol_V1.7.pdf . The document numbers the measurements as 30001... and each 4-byte parameter as 40001...; its "Modbus Protocol Start Address Hex" column is the wire address and is used here unchanged (e.g. 30001 = 0x0000 = 0, 40001 = 0x0000 = 0). All measured values and all setup parameters are IEEE-754 single precision floats (high word first), measurements read with function code 04 and settings with function code 03/16. Factory serial settings from the holding-register table: 9600 baud (register 40029 = 0x1C = 28, value 2 = 9600 is the documented default), one stop bit and no parity (register 40019 = 0x12 = 18, value 0 is the documented default), Modbus node address 1 (register 40021 = 0x14 = 20, value 1 is the documented default) and 8 data bits per section 1.1. This is the CT-operated SDM630 variant with its own map; the direct-connected SDM630-Modbus is a separate seed. Registers that the table leaves out (reserved ranges) are not listed.