Legrand EMDX3 multifunction meter (4 120 45)

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_voltage	4096	U32BE	0.001	mV
phase_2_voltage	4098	U32BE	0.001	mV
phase_3_voltage	4100	U32BE	0.001	mV
phase_1_current	4102	U32BE	0.001	mA
phase_2_current	4104	U32BE	0.001	mA
phase_3_current	4106	U32BE	0.001	mA
neutral_current	4108	U32BE	0.001	mA
chained_voltage_l1_l2	4110	U32BE	0.001	mV
chained_voltage_l2_l3	4112	U32BE	0.001	mV
chained_voltage_l3_l1	4114	U32BE	0.001	mV
three_phase_active_power	4116	U32BE	1	W
three_phase_reactive_power	4118	U32BE	1	var
three_phase_apparent_power	4120	U32BE	1	VA
three_phase_positive_active_energy	4124	U32BE	1	Wh
three_phase_positive_reactive_energy	4126	U32BE	1	varh
three_phase_negative_active_energy	4128	U32BE	1	Wh
three_phase_negative_reactive_energy	4130	U32BE	1	varh
three_phase_power_factor	4132	I16	0.01
frequency	4134	U16	0.1	Hz
phase_1_thd_v1	4170	U16	0.1	%
phase_2_thd_v2	4171	U16	0.1	%
phase_3_thd_v3	4172	U16	0.1	%
phase_1_thd_i1	4173	U16	0.1	%
phase_2_thd_i2	4174	U16	0.1	%
phase_3_thd_i3	4175	U16	0.1	%

link settings as documented (unverified): RTU; FC 03,16

bench facts as documented (unverified)

terminals	two-wire configuration
connector	standard EIA/TIA 485 (RS-485)
response timeout	300 ms
inter-frame delay	20 ms
model register	768

generated by gemini:gemini-3.5-flash · harvested from https://assets.legrand.com/general/mediagrp/np-ft-gt/emdx3%20multifunction%20meter%20modbustable%20412045.pdf (Legrand); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-11 · recorded 2026-06-11

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.