Northern Design Cube 400 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
eScale	512	U32BE	1
kWh	514	U32BE	1	kWh
kVAh	516	U32BE	1	kVAh
kvarh Inductive	518	U32BE	1	kvarh
kvarh Capacitive	520	U32BE	1	kvarh
Import kvarh	522	U32BE	1	kvarh
Export kWh	524	U32BE	1	kWh
Export kvarh	526	U32BE	1	kvarh
Hours Run	528	U32BE	1	hours
System kW	2816	I16	1
System kVA	2817	I16	1
System kvar	2818	I16	1
System PF	2819	I16	0.001
Frequency	2820	I16	0.1
Phase 1 Volts	2821	I16	1
Phase 1 Amps	2822	I16	1
Phase 1 kW	2823	I16	1
Phase 2 Volts	2824	I16	1
Phase 2 Amps	2825	I16	1
Phase 2 kW	2826	I16	1
Phase 3 Volts	2827	I16	1
Phase 3 Amps	2828	I16	1
Phase 3 kW	2829	I16	1
Phase 1 PF	2830	I16	0.001
Phase 2 PF	2831	I16	0.001
Phase 3 PF	2832	I16	0.001
Ph1-Ph2 Volts	2833	I16	1
Ph2-Ph3 Volts	2834	I16	1
Ph3-Ph1 Volts	2835	I16	1
Neutral Current	2836	I16	1
Amps Scale Ki	2837	I16	1
Phase Volts Scale Kvp	2838	I16	1
Line Volts Scale Kvl	2839	I16	1
Power Scale Kp	2840	I16	1
Phase 1 kVA	3072	I16	1
Phase 2 kVA	3073	I16	1
Phase 3 kVA	3074	I16	1
Phase 1 kvar	3075	I16	1
Phase 2 kvar	3076	I16	1
Phase 3 kvar	3077	I16	1
Peak Hold Ph1 Amps	3328	I16	1
Peak Hold Ph2 Amps	3329	I16	1
Peak Hold Ph3 Amps	3330	I16	1
Peak Hold Ph1 Volts	3331	I16	1
Peak Hold Ph2 Volts	3332	I16	1
Peak Hold Ph3 Volts	3333	I16	1
Peak Hold kW Demand	3334	U16	1
KW Demand Period	3335	U16	1	Minutes
KW Demand	3336	U16	1
KVA Demand	3337	U16	1
Peak Hold kVA Demand	3338	U16	1
Kvar Demand	3339	U16	1
Peak Hold kvar Demand	3340	U16	1
CT Primary	3584	U16	1	Amps
Nominal Volts	3585	U16	1	Volts
Pulse 1 Rate	3586	U16	1	Counts/Pulse
Pulse 2 Rate	3587	U16	1	Counts/Pulse
Baud	3588	U16	1
Modbus ID	3589	U16	1
Meter Model	3590	U16	1
Meter Type	3591	U16	1
Firmware Version	3592	U16	1
Current Demand Period	3593	U16	1
Pulse ON Time	3594	U16	1
Security Code	3595	U16	1
Hours Run Limit	3596	U16	1
PT Scaling Factor	3597	U16	1
Peak Ph1 Amps Demand	3840	U16	1
Peak Ph2 Amps Demand	3841	U16	1
Peak Ph3 Amps Demand	3842	U16	1
Peak Ph1 Volts Demand	3843	U16	1
Peak Ph2 Volts Demand	3844	U16	1
Peak Ph3 Volts Demand	3845	U16	1
Ph1 Amps Demand	4096	U16	1
Ph2 Amps Demand	4097	U16	1
Ph3 Amps Demand	4098	U16	1
Ph1 Volts Demand	4099	U16	1
Ph2 Volts Demand	4100	U16	1
Ph3 Volts Demand	4101	U16	1
V1 % THD	4352	U16	0.1	%
V2 % THD	4353	U16	0.1	%
V3 % THD	4354	U16	0.1	%
I1 % THD	4355	U16	0.1	%
I2 % THD	4356	U16	0.1	%
I3 % THD	4357	U16	0.1	%
kW Demand	4608	I16	1
kVA Demand	4609	I16	1
Kvar Demand	4610	I16	1
Peak Hold kW Demand	4611	I16	1
Peak Hold kVA Demand	4612	I16	1
Peak Hold kvar Demand	4613	I16	1
KWh High Word	7680	U16	1
KWh Low Word	7681	U16	1
KVAh High Word	7682	U16	1
KVAh Low Word	7683	U16	1
Kvarh High Word	7684	U16	1
Kvarh Low Word	7685	U16	1
Export kWh High Word	7686	U16	1
Export kWh Low Word	7687	U16	1
Phase 1 Amps	7688	I16	1
Phase 2 Amps	7689	I16	1
Phase 3 Amps	7690	I16	1
Phase 1 Volts	7691	I16	1
Phase 2 Volts	7692	I16	1
Phase 3 Volts	7693	I16	1
Ph1-Ph2 Volts	7694	I16	1
Ph2-Ph3 Volts	7695	I16	1
Ph3-Ph1 Volts	7696	I16	1
Frequency	7697	I16	0.1
Phase 1 PF	7698	I16	0.001
Phase 2 PF	7699	I16	0.001
Phase 3 PF	7700	I16	0.001
System PF	7701	I16	0.001
Phase 1 kW	7702	I16	1
Phase 2 kW	7703	I16	1
Phase 3 kW	7704	I16	1
System kW	7705	I16	1
Phase 1 kVA	7706	I16	1
Phase 2 kVA	7707	I16	1
Phase 3 kVA	7708	I16	1
System kVA	7709	I16	1
Phase 1 kvar	7710	I16	1
Phase 2 kvar	7711	I16	1
Phase 3 kvar	7712	I16	1
System kvar	7713	I16	1
Ph1 Amps Demand	7714	U16	1
Ph2 Amps Demand	7715	U16	1
Ph3 Amps Demand	7716	U16	1
Ph1 Volts Demand	7717	U16	1
Ph2 Volts Demand	7718	U16	1
Ph3 Volts Demand	7719	U16	1
Peak Ph1 Amps	7720	I16	1
Peak Ph2 Amps	7721	I16	1
Peak Ph3 Amps	7722	I16	1
Peak Ph1 Volts	7723	I16	1
Peak Ph2 Volts	7724	I16	1
Peak Ph3 Volts	7725	I16	1
kW Demand	7726	I16	1
kVA Demand	7727	I16	1
kvar Demand	7728	I16	1
Peak Hold kW Demand	7729	I16	1
Peak Hold kVA Demand	7730	I16	1
Peak Hold kvar Demand	7731	I16	1
Neutral Current	7732	I16	1
Amps Scale Ki	7733	I16	1
Phase Volts Scale Kvp	7734	I16	1
Line Volts Scale Kvl	7735	I16	1
Power Scale Kp	7736	I16	1
Energy Scale Ke	7737	I16	1
V1: 2nd Harmonic	7936	U16	0.1	%
V1: 3rd Harmonic	7937	U16	0.1	%
V1: 4th Harmonic	7938	U16	0.1	%
V1: 5th Harmonic	7939	U16	0.1	%
V1: 6th Harmonic	7940	U16	0.1	%
V1: 7th Harmonic	7941	U16	0.1	%
V1: 8th Harmonic	7942	U16	0.1	%
V1: 9th Harmonic	7943	U16	0.1	%
V1: 10th Harmonic	7944	U16	0.1	%
V1: 11th Harmonic	7945	U16	0.1	%
V1: 12th Harmonic	7946	U16	0.1	%
V1: 13th Harmonic	7947	U16	0.1	%
V1: 14th Harmonic	7948	U16	0.1	%
V1: 15th Harmonic	7949	U16	0.1	%
V2: 2nd Harmonic	8192	U16	0.1	%
V2: 3rd Harmonic	8193	U16	0.1	%
V2: 4th Harmonic	8194	U16	0.1	%
V2: 5th Harmonic	8195	U16	0.1	%
V2: 6th Harmonic	8196	U16	0.1	%
V2: 7th Harmonic	8197	U16	0.1	%
V2: 8th Harmonic	8198	U16	0.1	%
V2: 9th Harmonic	8199	U16	0.1	%
V2: 10th Harmonic	8200	U16	0.1	%
V2: 11th Harmonic	8201	U16	0.1	%
V2: 12th Harmonic	8202	U16	0.1	%
V2: 13th Harmonic	8203	U16	0.1	%
V2: 14th Harmonic	8204	U16	0.1	%
V2: 15th Harmonic	8205	U16	0.1	%
V3: 2nd Harmonic	8448	U16	0.1	%
V3: 3rd Harmonic	8449	U16	0.1	%
V3: 4th Harmonic	8450	U16	0.1	%
V3: 5th Harmonic	8451	U16	0.1	%
V3: 6th Harmonic	8452	U16	0.1	%
V3: 7th Harmonic	8453	U16	0.1	%
V3: 8th Harmonic	8454	U16	0.1	%
V3: 9th Harmonic	8455	U16	0.1	%
V3 10th Harmonic	8456	U16	0.1	%
V3: 11th Harmonic	8457	U16	0.1	%
V3: 12th Harmonic	8458	U16	0.1	%
V3: 13th Harmonic	8459	U16	0.1	%
V3: 14th Harmonic	8460	U16	0.1	%
V3: 15th Harmonic	8461	U16	0.1	%
I1: 2nd Harmonic	8704	U16	0.1	%
I1: 3rd Harmonic	8705	U16	0.1	%
I1: 4th Harmonic	8706	U16	0.1	%
I1: 5th Harmonic	8707	U16	0.1	%
I1: 6th Harmonic	8708	U16	0.1	%
I1: 7th Harmonic	8709	U16	0.1	%
I1: 8th Harmonic	8710	U16	0.1	%
I1: 9th Harmonic	8711	U16	0.1	%
I1: 10th Harmonic	8712	U16	0.1	%
I1: 11th Harmonic	8713	U16	0.1	%
I1: 12th Harmonic	8714	U16	0.1	%
I1: 13th Harmonic	8715	U16	0.1	%
I1: 14th Harmonic	8716	U16	0.1	%
I1: 15th Harmonic	8717	U16	0.1	%
I2: 2nd Harmonic	8960	U16	0.1	%
I2: 3rd Harmonic	8961	U16	0.1	%
I2: 4th Harmonic	8962	U16	0.1	%
I2: 5th Harmonic	8963	U16	0.1	%
I2: 6th Harmonic	8964	U16	0.1	%
I2: 7th Harmonic	8965	U16	0.1	%
I2: 8th Harmonic	8966	U16	0.1	%
I2: 9th Harmonic	8967	U16	0.1	%
I2: 10th Harmonic	8968	U16	0.1	%
I2: 11th Harmonic	8969	U16	0.1	%
I2: 12th Harmonic	8970	U16	0.1	%
I2: 13th Harmonic	8971	U16	0.1	%
I2: 14th Harmonic	8972	U16	0.1	%
I2: 15th Harmonic	8973	U16	0.1	%
I3: 2nd Harmonic	9216	U16	0.1	%
I3: 3rd Harmonic	9217	U16	0.1	%
I3: 4th Harmonic	9218	U16	0.1	%
I3: 5th Harmonic	9219	U16	0.1	%
I3: 6th Harmonic	9220	U16	0.1	%
I3: 7th Harmonic	9221	U16	0.1	%
I3: 8th Harmonic	9222	U16	0.1	%
I3: 9th Harmonic	9223	U16	0.1	%
I3: 10th Harmonic	9224	U16	0.1	%
I3: 11th Harmonic	9225	U16	0.1	%
I3: 12th Harmonic	9226	U16	0.1	%
I3: 13th Harmonic	9227	U16	0.1	%
I3: 14th Harmonic	9228	U16	0.1	%
I3: 15th Harmonic	9229	U16	0.1	%
Custom Address 0	19200	U16	1
Custom Address 1	19201	U16	1
Custom Address 2	19202	U16	1
Custom Address 3	19203	U16	1
Custom Address 4	19204	U16	1
Custom Address 5	19205	U16	1
Custom Address 6	19206	U16	1
Custom Address 7	19207	U16	1
Custom Address 8	19208	U16	1
Custom Address 9	19209	U16	1
Custom Address 10	19210	U16	1
Custom Address 11	19211	U16	1
Custom Address 12	19212	U16	1
Custom Address 13	19213	U16	1
Custom Address 14	19214	U16	1
Custom Address 15	19215	U16	1
Custom Address 16	19216	U16	1
Custom Address 17	19217	U16	1
Custom Address 18	19218	U16	1
Custom Address 19	19219	U16	1
Custom Address 20	19220	U16	1
Custom Address 21	19221	U16	1
Custom Address 22	19222	U16	1
Custom Address 23	19223	U16	1
Custom Address 24	19224	U16	1
Custom Address 25	19225	U16	1
Custom Address 26	19226	U16	1
Custom Address 27	19227	U16	1
Custom Address 28	19228	U16	1
Custom Address 29	19229	U16	1
Custom Address 30	19230	U16	1
Custom Address 31	19231	U16	1

link settings as documented (unverified): RTU; baud 4800/9600/19200; FC 03,04,06,08,16; Modbus RTU/JBUS, 16-Bit CRC

⚠ The Cube400 is intended for connection to dangerous voltages giving a risk of electric shock. Refer to the safety/installation instructions in the Cube400 Installation Guide before connecting the communications. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	Rising clamp, max wire 4mm2
termination	Two 120 Ohm resistors recommended
isolation	3.5kV (1 minute) RS485 Port from all other circuit
shield/ground	Shield should be connected to ground at the host (PC) only. The cable shield should not be used as the 0V connection.
wiring notes	3-Pairs of terminals, internally shorted, are provided for convenience.
max registers/read	20
response timeout	250 ms
inter-frame delay	5 ms
broadcast	supported
protocol notes	Exception codes 1 and 2 are supported.
model register	3590
firmware register	3592
identification notes	Meter Type is at register 3591.
power	Internally supplied from Cube400 Auxiliary. Requires additional 1W max
doc revision	Revision 5, July 2016

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

When attempting to read a non-existent register (e.g., register 2815 / 0x0AFF) over Modbus TCP, the device echoes back the exact request bytes instead of returning a standard Modbus exception response, causing an 'Incorrect PDU length' error in the master. [source]
confirmed: Baud rates [4800, 9600, 19200], framing [RTU], function codes [3, 4, 6, 8, 16], Modbus RTU/JBUS, 16-Bit CRC — confirmed by Cube400 Modbus Comms Manual REV5
confirmed: Control warning regarding dangerous voltages and safety instructions — confirmed by Cube400 Modbus Comms Manual REV5
confirmed: Document revision 'Revision 5, July 2016' — confirmed by Cube400 Modbus Comms Manual REV5
confirmed: Identification registers (model at 3590, type at 3591, firmware at 3592) — confirmed by Cube400 Modbus Comms Manual REV5
confirmed: Physical specifications (3.5kV isolation, 3-pairs of internally shorted terminals, shield ground recommendations, rising clamp terminals up to 4mm2, and two 120 Ohm resistors recommended) — confirmed by Cube400 Modbus Comms Manual REV5
confirmed: Power requirements (internally supplied from auxiliary, additional 1W max) — confirmed by Cube400 Modbus Comms Manual REV5
confirmed: Quirks (broadcast supported, 5ms inter-frame delay, max 20 read registers, exception codes 1 and 2 supported, 250ms response timeout) — confirmed by Cube400 Modbus Comms Manual REV5
confirmed: Register map summary (energy registers starting at 514, instantaneous values starting at 2816, additional instantaneous values starting at 3072, and THD values starting at 4352) — confirmed by Cube400 Modbus Comms Manual REV5

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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