Eastron SDM630MCT energy meter

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

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_active_power	12	F32BE	1	W
phase_2_active_power	14	F32BE	1	W
phase_3_active_power	16	F32BE	1	W
phase_1_apparent_power	18	F32BE	1	VA
phase_2_apparent_power	20	F32BE	1	VA
phase_3_apparent_power	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

link settings as documented (unverified): RTU; default 9600 8N1; unit ID 1; FC 03,04,08,16; Register Order controls the order in which the Eastron Digital meter receives or sends floating-point numbers.

bench facts as documented (unverified)

terminals	2 screw terminals
A/B polarity	A and B
termination	120 ohm (0.25 Watt min.) resistor
connector	screw terminals
shield/ground	The cable screen should be connected to the 'Gnd' terminals.
wiring notes	twisted pair screened cable (Typically 22 gauge Belden 8761 or equivalent)
max registers/read	60
broadcast	not supported
protocol notes	Each request for data must be restricted to 40 parameters or less.
model register	464515
serial register	464513
firmware register	464516
doc revision	V1.7

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

On the Eastron SDM630MCT+ESCT-TA16 120A/40mA model, a discrepancy occurs where the meter sums export and import values without signs (i.e., it is not a 'balanced' meter), causing incorrect total export/import values to be transmitted to SolisCloud. This requires a specific firmware update to resolve. [source]
On MID-certified versions of the meter (such as SDM630MCT-E-MID), once the CT ratio is set, it is permanently locked and cannot be reconfigured remotely or locally to comply with MID regulations. [source]
confirmed: Baud rates [2400, 4800, 9600, 19200, 38400] and default baud 9600 — confirmed by Eastron SDM630MCT Smart Meter Modbus Protocol Implementation V1.7
confirmed: Default unit ID 1 — confirmed by Eastron SDM630MCT Smart Meter Modbus Protocol Implementation V1.7
confirmed: Framing RTU and function codes [3, 4, 8, 16] — confirmed by Eastron SDM630MCT Smart Meter Modbus Protocol Implementation V1.7
confirmed: Parity N and stop bits 1 — confirmed by Eastron SDM630MCT Smart Meter Modbus Protocol Implementation V1.7
confirmed: Register Order controls the order in which the Eastron Digital meter receives or sends floating-point numbers — confirmed by Eastron SDM630MCT Smart Meter Modbus Protocol Implementation V1.7
confirmed: Identification registers (firmware_register 464516, model_register 464515, serial_register 464513) — confirmed by Eastron SDM630MCT Smart Meter Modbus Protocol Implementation V1.7
confirmed: Physical connection details (screw terminals, twisted pair screened cable, polarity A and B, shield ground to Gnd, 120 ohm termination resistor) — confirmed by Eastron SDM630MCT Smart Meter Modbus Protocol Implementation V1.7
confirmed: Broadcast supported false, max read registers 60, and 40 parameters limit — confirmed by Eastron SDM630MCT Smart Meter Modbus Protocol Implementation V1.7

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.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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