Eastron SDM630 Series
Reads three-phase energy metering data from Eastron SDM630 meters.
This ModbusCloud template reads three-phase electrical measurements from the Eastron SDM630 multifunctional energy meter family (V1, V2, and V3) over Modbus RTU at 9600 baud. All fifteen registers are read only float32 values covering per-phase voltage and current, per-phase and total active, reactive, and apparent power, import and export energy totals, and line frequency.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 15, read only
- Brand
- Eastron
- Key readings
- Voltage L1 to L3 · Current L1 to L3 · Power L1 to L3 · Total active/apparent/reactive Power · Total Energy Import/Export · Frequency
- Compatible models
- SDM630 · SDM630 V1 · SDM630 V2 · SDM630 V3
- Last updated
Registers (15)
15 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Voltage L1 | V | Read | |||
| Voltage L2 | V | Read | |||
| Voltage L3 | V | Read | |||
| Current L1 | A | Read | |||
| Current L2 | A | Read | |||
| Current L3 | A | Read | |||
| Power L1 | W | Read | |||
| Power L2 | W | Read | |||
| Power L3 | W | Read | |||
| Total active Power | W | Read | |||
| Frequency | Hz | Read | |||
| Total Energy Import | kWh | Read | |||
| Total Energy Export | kWh | Read | |||
| Total apparent Power | VA | Read | |||
| Total reactive Power | var | Read |
Loading registers…
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If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Track total building consumption, per-phase load, and solar export on a live ModbusCloud dashboard.
- Alert the installer when any phase current exceeds a safe threshold for more than a minute to catch overloads early.
- Log import and export energy separately for net-billing compliance reports.
- Compare measured consumption against invoiced kWh from the utility to spot metering or billing discrepancies.
- Feed per-phase power into an automation rule that throttles an EV charger when building peak demand is approached.
Installation
Wire the SDM630 A and B terminals to the RS485 channel of your ModbusCloud gateway using twisted pair cable, keeping a common ground where possible.
Verify the meter settings in the front panel menu: address 1, baudrate 9600, 1 stop bit, no parity. Change only if you have multiple meters on the bus.
In ModbusCloud, add a new Modbus RTU device with the same address and baudrate, then import the Eastron SDM630 template.
Confirm voltage and current readings match the meter display. If numbers look swapped or scaled wrong, enable byte order swap in device settings.
Things to watch for
Voltages read correctly but currents are zero. What is wrong?
This is almost always a missing CT connection on the meter. Check that the current transformers are clamped in the right orientation and wired to the correct meter terminals. The SDM630 shows live currents on its display, which is the fastest way to verify hardware before suspecting Modbus.
I see wildly wrong numbers like 3.4e38. Byte order problem?
Yes. Float32 registers can be decoded ABCD, CDAB, BADC, or DCBA depending on the converter. Swap the byte order in ModbusCloud device settings. For a direct RS485 connection on ModbusCloud gateways, ABCD is the correct default.
Can I daisy chain multiple SDM630 meters on one RS485 bus?
Yes. Give each meter a unique Modbus address (2, 3, 4, ...) through the front panel menu, then create one device per meter in ModbusCloud and import this template on each. The bus can handle up to 32 meters in practice.
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