Eaton IQ250/IQ260 power 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
Meter Name	0	U16	1
Meter Serial Number	8	U16	1
Meter Type	16	U16	1
Firmware Version	17	U16	1
Map Version	19	U16	1
Meter Configuration	20	U16	1
ASIC Version	21	U16	1
Boot Firmware Version	22	U16	1
Option Slot 1 Usage	24	U16	1
Option Slot 2 Usage	25	U16	1
Meter Type Name	26	U16	1
Volts A-N	278	U16	1	V
Volts B-N	279	U16	1	V
Volts C-N	280	U16	1	V
Volts A-B	281	U16	1	V
Volts B-C	282	U16	1	V
Volts C-A	283	U16	1	V
Amps A	284	U16	1	A
Amps B	285	U16	1	A
Amps C	286	U16	1	A
Neutral Current	287	U16	1	A
Watts, 3-Ph total	288	I16	1	W
VARs, 3-Ph total	289	I16	1	VAR
VAs, 3-Ph total	290	U16	1	VA
Power Factor, 3-Ph total	291	I16	1
Frequency	292	U16	1	Hz
Watts, Phase A	293	I16	1	W
Watts, Phase B	294	I16	1	W
Watts, Phase C	295	I16	1	W
VARs, Phase A	296	I16	1	VAR
VARs, Phase B	297	I16	1	VAR
VARs, Phase C	298	I16	1	VAR
VAs, Phase A	299	U16	1	VA
VAs, Phase B	300	U16	1	VA
VAs, Phase C	301	U16	1	VA
Power Factor, Phase A	302	I16	1
Power Factor, Phase B	303	I16	1
Power Factor, Phase C	304	I16	1
Volts A-N	999	F32BE	1	V
Volts B-N	1001	F32BE	1	V
Volts C-N	1003	F32BE	1	V
Volts A-B	1005	F32BE	1	V
Volts B-C	1007	F32BE	1	V
Volts C-A	1009	F32BE	1	V
Amps A	1011	F32BE	1	A
Amps B	1013	F32BE	1	A
Amps C	1015	F32BE	1	A
Watts, 3-Ph total	1017	F32BE	1	W
VARs, 3-Ph total	1019	F32BE	1	VAR
VAs, 3-Ph total	1021	F32BE	1	VA
Power Factor, 3-Ph total	1023	F32BE	1
Frequency	1025	F32BE	1	Hz
Neutral Current	1027	F32BE	1	A
Watts, Phase A	1029	F32BE	1	W
Watts, Phase B	1031	F32BE	1	W
Watts, Phase C	1033	F32BE	1	W
VARs, Phase A	1035	F32BE	1	VAR
VARs, Phase B	1037	F32BE	1	VAR
VARs, Phase C	1039	F32BE	1	VAR
VAs, Phase A	1041	F32BE	1	VA
VAs, Phase B	1043	F32BE	1	VA
VAs, Phase C	1045	F32BE	1	VA
Power Factor, Phase A	1047	F32BE	1
Power Factor, Phase B	1049	F32BE	1
Power Factor, Phase C	1051	F32BE	1
Symmetrical Component Magnitude, 0 Seq	1053	F32BE	1	V
Symmetrical Component Magnitude, + Seq	1055	F32BE	1	V
Symmetrical Component Magnitude, - Seq	1057	F32BE	1	V
Symmetrical Component Phase, 0 Seq	1059	I16	0.1	degree
Symmetrical Component Phase, + Seq	1060	I16	0.1	degree
Symmetrical Component Phase, - Seq	1061	I16	0.1	degree
Unbalance, 0 sequence component	1062	U16	0.01	%
Unbalance, -sequence component	1063	U16	0.01	%
Current Unbalance	1064	U16	0.01	%
W-hours, Received	1499	I32BE	1	Wh
W-hours, Delivered	1501	I32BE	1	Wh
W-hours, Net	1503	I32BE	1	Wh
W-hours, Total	1505	I32BE	1	Wh
VAR-hours, Positive	1507	I32BE	1	VARh
VAR-hours, Negative	1509	I32BE	1	VARh
VAR-hours, Net	1511	I32BE	1	VARh
VAR-hours, Total	1513	I32BE	1	VARh
VA-hours, Total	1515	I32BE	1	VAh
W-hours, Received, Phase A	1517	I32BE	1	Wh
W-hours, Received, Phase B	1519	I32BE	1	Wh
W-hours, Received, Phase C	1521	I32BE	1	Wh
W-hours, Delivered, Phase A	1523	I32BE	1	Wh
W-hours, Delivered, Phase B	1525	I32BE	1	Wh
W-hours, Delivered, Phase C	1527	I32BE	1	Wh
W-hours, Net, Phase A	1529	I32BE	1	Wh
W-hours, Net, Phase B	1531	I32BE	1	Wh
W-hours, Net, Phase C	1533	I32BE	1	Wh
W-hours, Total, Phase A	1535	I32BE	1	Wh
W-hours, Total, Phase B	1537	I32BE	1	Wh
W-hours, Total, Phase C	1539	I32BE	1	Wh
VAR-hours, Positive, Phase A	1541	I32BE	1	VARh
VAR-hours, Positive, Phase B	1543	I32BE	1	VARh
VAR-hours, Positive, Phase C	1545	I32BE	1	VARh
VAR-hours, Negative, Phase A	1547	I32BE	1	VARh
VAR-hours, Negative, Phase B	1549	I32BE	1	VARh
VAR-hours, Negative, Phase C	1551	I32BE	1	VARh
VAR-hours, Net, Phase A	1553	I32BE	1	VARh
VAR-hours, Net, Phase B	1555	I32BE	1	VARh
VAR-hours, Net, Phase C	1557	I32BE	1	VARh
VAR-hours, Total, Phase A	1559	I32BE	1	VARh
VAR-hours, Total, Phase B	1561	I32BE	1	VARh
VAR-hours, Total, Phase C	1563	I32BE	1	VARh
VA-hours, Phase A	1565	I32BE	1	VAh
VA-hours, Phase B	1567	I32BE	1	VAh
VA-hours, Phase C	1569	I32BE	1	VAh
Amps A, Average	1999	F32BE	1	A
Amps B, Average	2001	F32BE	1	A
Amps C, Average	2003	F32BE	1	A
Positive Watts, 3-Ph, Average	2005	F32BE	1	W
Positive VARs, 3-Ph, Average	2007	F32BE	1	VAR
Negative Watts, 3-Ph, Average	2009	F32BE	1	W
Negative VARs, 3-Ph, Average	2011	F32BE	1	VAR
VAs, 3-Ph, Average	2013	F32BE	1	VA
Positive PF, 3-Ph, Average	2015	F32BE	1
Negative PF, 3-PF, Average	2017	F32BE	1
Neutral Current, Average	2019	F32BE	1	A
Watts, 3-Ph total	2999	F32BE	1	W
VARs, 3-Ph total	3001	F32BE	1	VAR
VAs, 3-Ph total	3003	F32BE	1	VA
Power Factor, 3-Ph total	3005	F32BE	1
Phase A Current	4099	I16	0.1	degree
Phase B Current	4100	I16	0.1	degree
Phase C Current	4101	I16	0.1	degree
Angle, Volts A-B	4102	I16	0.1	degree
Angle, Volts B-C	4103	I16	0.1	degree
Angle, Volts C-A	4104	I16	0.1	degree
Port ID	4499	U16	1
Meter Status	4500	U16	1
Limits Status	4501	U16	1
Time Since Reset	4502	U32BE	4	ms
Meter On Time	4504	U16	1
Current Date and Time	4507	U16	1
Clock Sync Status	4510	U16	1
Current Day of Week	4511	U16	1	day
Volts A-N, %THD	5999	U16	0.01	%
Volts B-N, %THD	6000	U16	0.01	%
Volts C-N, %THD	6001	U16	0.01	%
Amps A, %THD	6002	U16	0.01	%
Amps B, %THD	6003	U16	0.01	%
Amps C, %THD	6004	U16	0.01	%
Reset Max/Min Blocks	19999	U16	1
Reset Energy Accumulators	20000	U16	1
Reset Alarm Log	20001	U16	1
Reset System Log	20002	U16	1
Reset Historical Log 1	20003	U16	1
Reset I/O Change Log	20006	U16	1
Reset Power Quality Log	20007	U16	1
Reset Waveform Capture Log	20008	U16	1
Reset Option Card 1 Input Accumulators	20011	U16	1
Reset Option Card 1 Output Accumulators	20012	U16	1
Reset Option Card 2 Input Accumulators	20013	U16	1
Reset Option Card 2 Output Accumulators	20014	U16	1
Initiate Meter Firmware Reprogramming	20999	U16	1
Force Meter Restart	21000	U16	1
Open Privileged Command Session	21001	U16	1
Initiate Programmable Settings Update	21002	U16	1
Calculate Programmable Settings Checksum	21003	U16	1
Programmable Settings Checksum	21004	U16	1
Write New Password	21005	U16	1
Terminate Programmable Settings Update	21006	U16	1
Set Meter Clock	21007	U16	1
Close Privileged Command Session	21018	U16	1
CT multiplier & denominator	29999	U16	1
CT numerator	30000	U16	1
PT numerator	30001	U16	1
PT denominator	30002	U16	1
PT multiplier & hookup	30003	U16	1
Averaging Method	30004	U16	1
Power & Energy Format	30005	U16	1
Operating Mode Screen Enables	30006	U16	1
Daylight Saving On Rule	30007	U16	1
Daylight Saving Off Rule	30008	U16	1
Time Zone UTC offset	30009	U16	1
Clock Sync Configuration	30010	U16	1
User Settings 2	30012	U16	1
DNP Options	30013	U16	1
User Settings Flags	30014	U16	1
Full Scale Current	30015	U16	1
Meter Designation	30016	U16	1
COM1 setup	30024	U16	1
COM2 setup	30025	U16	1
COM2 address	30026	U16	1
Limit #1 Identifier	30027	U16	1
Limit #1 Out High Setpoint	30028	I16	1
System Sanity Indicator	40000	U16	1
Volts A-N	40001	U16	1	V
Volts B-N	40002	U16	1	V
Volts C-N	40003	U16	1	V
Amps A	40004	U16	1	A
Amps B	40005	U16	1	A
Amps C	40006	U16	1	A
Watts, 3-Ph total	40007	U16	1	W
VARs, 3-Ph total	40008	U16	1	VAR
VAs, 3-Ph total	40009	U16	1	VA
Power Factor, 3-Ph total	40010	U16	1
Frequency	40011	U16	1	Hz
Volts A-B	40012	U16	1	V
Volts B-C	40013	U16	1	V
Volts C-A	40014	U16	1	V
CT numerator	40015	U16	1
CT multiplier	40016	U16	1
CT denominator	40017	U16	1
PT numerator	40018	U16	1
PT multiplier	40019	U16	1
PT denominator	40020	U16	1
W-hours, Positive	40021	U32BE	1	Wh
W-hours, Negative	40023	U32BE	1	Wh
VAR-hours, Positive	40025	U32BE	1	VARh
VAR-hours, Negative	40027	U32BE	1	VARh
VA-hours	40029	U32BE	1	VAh
Log Retrieval Session Duration	49996	U32BE	4	ms
Log Retrieval Session Com Port	49998	U16	1
Log Number, Enable, Scope	49999	U16	1
Records per Window or Batch, Record Scope Selector, Number of Repeats	50000	U16	1
Offset of First Record in Window	50001	U32BE	1
Log Retrieve Window	50003	U16	1
System Log Log Size in Records	51016	U32BE	1
Number of Records Used	51018	U32BE	1
Record Size in Bytes	51020	U16	1
Log Availability	51021	U16	1
Timestamp, First Record	51022	U16	1
Timestamp, Last Record	51025	U16	1

link settings as documented (unverified): RTU/ASCII; baud 9600/19200/38400/57600; FC 03,06,16,35; Modbus Function Code 0x23 (35) is a user-defined function code used for log retrieval with repeat counts.

bench facts as documented (unverified)

protocol notes	A 'babbling log' occurs when a log fills a flash sector in less than an hour. In LIMP state, the meter reboots at 5 minute intervals.
model register	0010
serial register	0008
firmware register	0011
identification notes	Meter Serial Number is located at registers 0008 - 000F (Hex).
FC 43 device ID	not supported

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

confirmed: Baud rates [9600, 19200, 38400, 57600], framing [RTU, ASCII], parity [N], and stop bits [1] — confirmed by Eaton IQ 250/260 series power meters technical datasheet
confirmed: Modbus Function Code 0x23 (35) is a user-defined function code used for log retrieval with repeat counts — confirmed by Eaton IQ 250/260 Modbus Register Map Guide
confirmed: Meter Serial Number is located at registers 0008 - 000F (Hex) — confirmed by Eaton IQ 250/260 Modbus Register Map Guide
confirmed: Model register is 0010 (Hex) and Firmware register is 0011 (Hex) — confirmed by Eaton IQ 250/260 Modbus Register Map Guide
confirmed: A 'babbling log' occurs when a log fills a flash sector in less than an hour, and in LIMP state, the meter reboots at 5 minute intervals — confirmed by Eaton IQ 250/260 Modbus Register Map Guide
confirmed: Register map addresses (e.g., volts_a_n @ 999, w_hours_received @ 1499, volts_a_n_thd @ 5999) — confirmed by Eaton IQ 250/260 Modbus Register Map Guide

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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