Eastron SDM630 energy meter

Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based as on the wire; word order and scaling are only confirmed at the hardware-verified rung.

interop-verified

Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.

point	address (0-based)	type	scale	unit
phase_1_line_to_neutral_volts	0	F32BE	1	V
phase_2_line_to_neutral_volts	2	F32BE	1	V
phase_3_line_to_neutral_volts	4	F32BE	1	V
phase_1_current	6	F32BE	1	A
phase_2_current	8	F32BE	1	A
phase_3_current	10	F32BE	1	A
phase_1_power	12	F32BE	1	W
phase_2_power	14	F32BE	1	W
phase_3_power	16	F32BE	1	W
phase_1_volt_amps	18	F32BE	1	VA
phase_2_volt_amps	20	F32BE	1	VA
phase_3_volt_amps	22	F32BE	1	VA
phase_1_reactive_power	24	F32BE	1	var
phase_2_reactive_power	26	F32BE	1	var
phase_3_reactive_power	28	F32BE	1	var
phase_1_power_factor	30	F32BE	1
phase_2_power_factor	32	F32BE	1
phase_3_power_factor	34	F32BE	1
average_line_to_neutral_volts	42	F32BE	1	V
average_line_current	46	F32BE	1	A
sum_of_line_currents	48	F32BE	1	A
total_system_power	52	F32BE	1	W
total_system_volt_amps	56	F32BE	1	VA
total_system_var	60	F32BE	1	var
total_system_power_factor	62	F32BE	1
frequency_of_supply_voltages	70	F32BE	1	Hz
total_import_kwh	72	F32BE	1	kWh
total_export_kwh	74	F32BE	1	kWh
total_import_kvarh	76	F32BE	1	kvarh
total_export_kvarh	78	F32BE	1	kvarh
line_1_to_line_2_volts	200	F32BE	1	V
line_2_to_line_3_volts	202	F32BE	1	V
line_3_to_line_1_volts	204	F32BE	1	V
average_line_to_line_volts	206	F32BE	1	V
neutral_current	224	F32BE	1	A
serial_number	64512	U32BE	1

link settings as documented (unverified): RTU; default 9600 8N1; unit ID 1; FC 03,04,08,16; RTU mode only. Supports No parity, Even parity, and Odd parity. Stop bits can be 1 or 2.

bench facts as documented (unverified)

terminals	2 screw terminals
termination	120 ohm (0.25 Watt min.) resistor
wiring notes	2-wire RS485. Screened twisted pair cable (Typically 22 gauge Belden 8761 or equivalent). Max length 1200m. Max 32 electrical nodes.
max registers/read	80
broadcast	not supported
protocol notes	All register read requests and data write requests must specify an even number of registers. Attempts to read/write an odd number of registers prompt the SDM630Modbus smart meter to return a Modbus Protocol exception message. Note: Page 1 states broadcast mode is supported, but Page 11 states it is not supported.
serial register	464513
identification notes	Serial number is at address 464513 (0xFC00) as unsigned int32.
doc revision	V1.8

field reports — community-sourced, unverified (checked 2026-06-11)

Users report off-by-one addressing issues in some Modbus clients (like Telegraf) where 1-based indexing causes the client to read the low-word of one metric and the high-word of the next, resulting in corrupted float32 values. [source]
ESPHome users report Modbus CRC check failures (e.g., 'Modbus CRC Check failed!') when communicating with the SDM630 due to timing and latency issues in specific framework versions. [source]
confirmed: Baud rates [2400, 4800, 9600, 19200, 38400] and default baud 9600 — confirmed by Eastron SDM630 User Manual
confirmed: Default unit ID 1 — confirmed by Eastron SDM630 User Manual
confirmed: Function codes 3, 4, 8, 16 — confirmed by Eastron SDM630 Modbus Protocol Implementation
confirmed: Serial number is at address 464513 (0xFC00) as unsigned int32 — confirmed by Eastron SDM630 Modbus Protocol Implementation
confirmed: All register read requests and data write requests must specify an even number of registers — confirmed by Eastron SDM630 Modbus Protocol Implementation
confirmed: Max read registers is 80 — confirmed by Eastron SDM630 Modbus Protocol Implementation

generated by gemini:gemini-3.5-flash · harvested from https://www.eastroneurope.com/images/uploads/products/protocol/SDM630_MODBUS_Protocol.pdf (Eastron); manual-faithful — the document's claims, panel risk: LOW — panel concurs, no field disagreements; proved interop-verified on 2026-06-10 · recorded 2026-06-10

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
interop-verified — Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.
simulator-verified — Decoded correctly against a protocol emulator seeded with known-true values — catches word-order/scaling errors vs the emulator, not the physical device.
hardware-verified x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

Have a device that isn't here? Upload its register map — generation is free, and the connector earns its rung by being proven, not claimed.

Need it proven on your own device? Hardware verification — if it doesn't verify, you don't pay.

Building a platform? License the verified library — machine-readable maps, firmware matrix, API access.